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Dynamic reconstruction of the source-to-sink system of the Paleogene Enping Formation in the Baiyun Sag,Pearl River Mouth Basin,China:Insights from stratigraphic forward modeling 认领 引用
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作者 GAO Jianlei LIU Keyu 《Petroleum Exploration and Development》 SCIE 2026年第1期152-166,共15页
Traditional source-to-sink analyses cannot effectively characterize deep-time sedimentary processes involving multiple sediment sources and the spatiotemporal evolution of sediment contributions from different sources... Traditional source-to-sink analyses cannot effectively characterize deep-time sedimentary processes involving multiple sediment sources and the spatiotemporal evolution of sediment contributions from different sources.In this study,a dynamic,quantitative source-to-sink analysis approach using stratigraphic forward modeling(SFM)is proposed,and it is applied to the Paleogene Enping Formation in the Baiyun Sag,Pearl River Mouth Basin.The built-in spatiotemporal provenance tagging of the model assigns a unique time-source label to sediments from each provenance,making each source's contribution identifiably“labeled”in the simulated formation,and thus enabling a direct precise tracking and high spatiotemporal resolution quantification of such contributions.Five pseudo-wells(from proximal to distal locations)in the Baiyun Sag were analyzed.The simulation results quantitatively represent the varied proportion of contribution of each source at different locations and in different periods and verify the proposed approach's operability and accuracy of the proposed approach.The simulated 3D deposit distribution shows a high agreement with the measured stratigraphic data,validating the model's reliability.Results reveal significant spatiotemporal changes in the Enping sedimentary system.In the late stage of Enping Formation deposition,a distal source supply from the northern part of the sag became dominant,the depocenter migrated northward to the deepwater area,and large-scale deltaic sand bodies extensively progradating into the sag were formed.The modeled 3D deposit distribution indicates that extensive high-quality reservoir sandstones are likely present across the deepwater area of the Baiyun Sag,which are identified as key exploration targets.Compared to traditional static approaches,the SFM-based dynamic simulation markedly enhances the spatiotemporal resolution of source-to-sink analysis and quantitatively captures the sedimentary system's responses to tectonic activity,base-level fluctuations and other external drivers.The proposed approach provides a novel quantitative framework for investigating complex,deep-time,multi-source systems,and offers an effective tool for reservoir prediction and hydrocarbon exploration planning in underexplored deepwater areas. 展开更多
关键词 source-to-sink system stratigraphic forward modeling reservoir prediction deepwater hydrocarbon exploration Baiyun Sag Pearl River Mouth Basin Paleogene Enping Formation
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Stratigraphic Forward Modeling of Late Quaternary Fluvial Dynamics in the Indus River Delta, Pakistan: Insights into Sea Level-Driven Sedimentary Evolution 认领 引用 被引量：1
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作者 HASSAN Hafiz Ahmed Raza LIU Keyu +3 位作者 LIU Jianliang MUNAWAR Muhammad Jawad REHMAN Saif Ur HUSSAIN Abid 《Journal of Ocean University of China》 SCIE CAS CSCD 2025年第6期1500-1518,共19页
Fluvial systems play a crucial role in coastal and riverine ecosystems, making it essential to understand their responses to sea level changes for preserving biodiversity and managing natural resources. The evolution ... Fluvial systems play a crucial role in coastal and riverine ecosystems, making it essential to understand their responses to sea level changes for preserving biodiversity and managing natural resources. The evolution of the modern Indus River Delta offers a rare opportunity to study the interplay between sea level fluctuations, tectonism, sediment supply, and the corresponding fluvial responses. This study employs the ‘SedSim' stratigraphic forward model to simulate the delta's evolution from 200 kyr to the next5 kyr, drawing on data from field observations, Landsat imagery, digital elevation models, and previous studies. The model consists of 205 layers, each representing a 1-kyr time step, covering the last two glacial-interglacial cycles. Between 200 kyr and 130 kyr, during a lowstand period, sedimentation on the delta plain continued due to partial flow from the Indus River. During the last interglacial(130–60 kyr), rising sea levels led to peak sediment deposition, characteristic of a highstand phase. From 60 kyr to 18 kyr, sea levels dropped to their lowest during the Last Glacial Maximum(LGM), resulting in extensive erosion and minimal deposition on the delta plain. From 18 kyr to the present, rapidly rising sea levels, coupled with intensified monsoon activity, increased sedimentation rates and triggered avulsion and aggradation processes. The model accurately predicted depositional thickness across the delta plain, indicating a maximum of ca. 200 m at the shoreline platform, ca. 175 m in the northeastern delta, and ca. 100 m in the central delta. The study underscores the delta's vulnerability to future sea level rise, which–at a projected rate of 1 m/kyr–could significantly influence the densely populated, low-lying delta plain. These findings offer valuable insights into the geomorphic evolution of the Indus Delta and emphasize the socioeconomic implications of sea level change, underscoring the importance of proactive management and adaptation strategies. 展开更多
关键词 fluvial responses sea level changes glacial-interglacial cycle sedimentary evolution stratigraphic forward modeling Indus Delta
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Variable-coordinate forward modeling of irregular surface based on dual-variable grid 认领 引用 被引量：18
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作者 Huang Jian-Ping Qu Ying-Ming +4 位作者 Li Qing-Yang Li Zhen-Chun Li Guo-Lei Bu Chang-Cheng Teng Hou-Hua 《Applied Geophysics》 SCIE CSCD 2015年第1期101-110,123,共10页
The mapping method is a forward-modeling method that transforms the irregular surface to horizontal by mapping the rectangular grid as curved;moreover,the wave field calculations move from the physical domain to the c... The mapping method is a forward-modeling method that transforms the irregular surface to horizontal by mapping the rectangular grid as curved;moreover,the wave field calculations move from the physical domain to the calculation domain.The mapping method deals with the irregular surface and the low-velocity layer underneath it using a fine grid.For the deeper high-velocity layers,the use of a fine grid causes local oversampling.In addition,when the irregular surface is transformed to horizontal,the flattened interface below the surface is transformed to curved,which produces inaccurate modeling results because of the presence of ladder-like burrs in the simulated seismic wave.Thus,we propose the mapping method based on the dual-variable finite-difference staggered grid.The proposed method uses different size grid spacings in different regions and locally variable time steps to match the size variability of grid spacings.Numerical examples suggest that the proposed method requires less memory storage capacity and improves the computational efficiency compared with forward modeling methods based on the conventional grid. 展开更多
关键词 mapping irregular surface boundary grid forward modeling
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Three-dimensional forward modeling for magnetotelluric sounding by finite element method 认领 引用 被引量：6
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作者 童孝忠 柳建新 +3 位作者 谢维 徐凌华 郭荣文 程云涛 《Journal of Central South University》 SCIE EI CAS 2009年第1期136-142,共7页
A finite element algorithm combined with divergence condition was presented for computing three-dimensional(3D) magnetotelluric forward modeling. The finite element equation of three-dimensional magnetotelluric forwar... A finite element algorithm combined with divergence condition was presented for computing three-dimensional(3D) magnetotelluric forward modeling. The finite element equation of three-dimensional magnetotelluric forward modeling was derived from Maxwell's equations using general variation principle. The divergence condition was added forcedly to the electric field boundary value problem, which made the solution correct. The system of equation of the finite element algorithm was a large sparse, banded, symmetric, ill-conditioned, non-Hermitian complex matrix equation, which can be solved using the Bi-CGSTAB method. In order to prove correctness of the three-dimensional magnetotelluric forward algorithm, the computed results and analytic results of one-dimensional geo-electrical model were compared. In addition, the three-dimensional magnetotelluric forward algorithm is given a further evaluation by computing COMMEMI model. The forward modeling results show that the algorithm is very efficient, and it has a lot of advantages, such as the high precision, the canonical process of solving problem, meeting the internal boundary condition automatically and adapting to all kinds of distribution of multi-substances. 展开更多
关键词 magnetotelluric sounding three-dimensional forward modeling finite element method general variation principle divergence condition
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1-D Controlled source electromagnetic forward modeling for marine gas hydrates studies 认领 引用 被引量：9
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作者 赵峦啸 耿建华 +1 位作者 张胜业 杨迪琨 《Applied Geophysics》 SCIE 2008年第2期121-126,共6页
We discuss the feasibility of using controlled-source electromagnetic （CSEM） in the frequency domain for prospecting marine gas hydrates. Based on the Ocean Drilling Program （ODP） Leg 164 log data, we have establi... We discuss the feasibility of using controlled-source electromagnetic （CSEM） in the frequency domain for prospecting marine gas hydrates. Based on the Ocean Drilling Program （ODP） Leg 164 log data, we have established several 1-D resistivity models which have different gas hydrate concentrations. Meanwhile, we analyzed the electromagnetic response of marine gas hydrates in the frequency domain based on these models. We also studied the relationship between electrical field magnitude or phase and parameters such as receiver-transmitter distance and frequency. Our numerical modeling results provide us with a quantitative reference for exploration and resource evaluation of marine gas hydrates. 展开更多
关键词 gas hydrate CSEM forward modeling resource evaluation
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The parallel 3D magnetotelluric forward modeling algorithm 认领 引用 被引量：34
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作者 Tan Handong Tong Tuo Lin Changhong 《Applied Geophysics》 2006年第4期197-202,共6页
The workload of the 3D magnetotelluric forward modeling algorithm is so large that the traditional serial algorithm costs an extremely large compute time. However, the 3D forward modeling algorithm can process the dat... The workload of the 3D magnetotelluric forward modeling algorithm is so large that the traditional serial algorithm costs an extremely large compute time. However, the 3D forward modeling algorithm can process the data in the frequency domain, which is very suitable for parallel computation. With the advantage of MPI and based on an analysis of the flow of the 3D magnetotelluric serial forward algorithm, we suggest the idea of parallel computation and apply it. Three theoretical models are tested and the execution efficiency is compared in different situations. The results indicate that the parallel 3D forward modeling computation is correct and the efficiency is greatly improved. This method is suitable for large size geophysical computations. 展开更多
关键词 Magnetotelluric 3D forward modeling MPI parallel programming design 3D staggered-grid finite difference method parallel algorithm.
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Three-dimensional forward modeling for the SBTEM method using an unstructured fi nite-element method 认领 引用 被引量：4
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作者 Wang Lu-Yuan Yin Chang-Chun +5 位作者 Liu Yun-He Su Yang Ren Xiu-Yan Hui Zhe-Jian Zhang Bo Xiong Bin 《Applied Geophysics》 SCIE CSCD 2021年第1期101-116,130,共16页
In this study,we propose a three-dimensional(3D)forward modeling algorithm of surface-to-borehole transient electromagnetic(SBTEM)fields based on an unstructured vector fi nite-element method to analyze the characteri... In this study,we propose a three-dimensional(3D)forward modeling algorithm of surface-to-borehole transient electromagnetic(SBTEM)fields based on an unstructured vector fi nite-element method to analyze the characteristics of SBTEM responses for complex geoelectrical models.To solve the double-curl diff usion equation for the electric fi eld,we use an unstructured tetrahedral mesh to discretize the model domain and select the unconditionally stable backward Euler scheme to discretize the time derivative.In our numerical experiments,we use a grounded wire as a transmitting source.After validating the algorithm’s eff ectiveness,we first analyze the diffusion characteristics and detectability of the electromagnetic field.After that,we focus our attention on the distribution and the cause of zero bands for Ex and dBy/dt components with the hope of guiding future field surveys.Finally,by simulating diff erent models,we analyze the capability of the SBTEM method in detecting typical mineral veins so that we can provide a reference for mineral resource exploration in the deep earth. 展开更多
关键词 Surface-to-borehole TEM forward modeling edge-based FE method unstructured grids zero bands
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Multicomponent seismic forward modeling of gas hydrates beneath the seafloor 认领 引用 被引量：8
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作者 杨佳佳 何兵寿 张建中 《Applied Geophysics》 SCIE CSCD 2014年第4期418-428,509,共11页
We investigated the effect of microscopic distribution modes of hydrates in porous sediments, and the saturation of hydrates and free gas on the elastic properties of saturated sediments. We simulated the propagation ... We investigated the effect of microscopic distribution modes of hydrates in porous sediments, and the saturation of hydrates and free gas on the elastic properties of saturated sediments. We simulated the propagation of seismic waves in gas hydrate-bearing sediments beneath the seafloor, and obtained the common receiver gathers of compressional waves（P-waves） and shear waves（S-waves）. The numerical results suggest that the interface between sediments containing gas hydrates and free gas produces a large-amplitude bottomsimulating reflector. The analysis of multicomponent common receiver data suggests that ocean-bottom seismometers receive the converted waves of upgoing P- and S-waves, which increases the complexity of the wavefield record. 展开更多
关键词 gas hydrates BSR finite difference forward modeling staggered grid
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Prestack forward modeling of tight reservoirs based on the Xu-White model 认领 引用 被引量：4
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作者 朱超 郭庆新 +3 位作者 宫清顺 刘占国 李森明 黄革萍 《Applied Geophysics》 SCIE CSCD 2015年第3期421-431,469,共11页
Inversion methods for conventional reservoirs cannot be used in tight reservoirs because of small differences in wave impedance between tight reservoirs and surrounding rocks. Tight reservoirs in westem China are char... Inversion methods for conventional reservoirs cannot be used in tight reservoirs because of small differences in wave impedance between tight reservoirs and surrounding rocks. Tight reservoirs in westem China are characterized by strong heterogeneity; thus, it is difficult to predict favorable zones using conventional reservoir inversion methods. In this study, we propose an inversion method based on the Xu-White model. First, we modify the test parameters of the Xu-White model until model P- and S-wave velocities and density values agree with well-logging data. Then, we calculate P- and S-wave velocities, density, and Poisson ratio for different lithologies and oil saturation and construct different geological models for interbedded sand and shale. Subsequently, we use approximations to Zoeppritz equations to perform prestack forward modeling and analyze the response characteristics of prestack gathers for different physical properties, lithology, and oil saturation. We analyze the response of thirteen types of elastic parameters to porosity, clay content, and oil saturation. After the optimization of the real prestack gathers in the Z area of western China, we select an elastic parameter that is the most sensitive to lithology and oil saturation to predict the distribution of oil-producing reservoirs with high accuracy. 展开更多
关键词 Xu-White model elastic parameter prestack forward modeling tight reservoir
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Forward modeling of marine DC resistivity method for a layered anisotropic earth 认领 引用 被引量：8
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作者 殷长春 张平 蔡晶 《Applied Geophysics》 SCIE CSCD 2016年第2期279-287,417,共9页
Since the ocean bottom is a sedimentary environment wherein stratification is well developed, the use of an anisotropic model is best for studying its geology. Beginning with Maxwell＇s equations for an anisotropic mo... Since the ocean bottom is a sedimentary environment wherein stratification is well developed, the use of an anisotropic model is best for studying its geology. Beginning with Maxwell＇s equations for an anisotropic model, we introduce scalar potentials based on the divergence-free characteristic of the electric and magnetic （EM） fields. We then continue the EM fields down into the deep earth and upward into the seawater and couple them at the ocean bottom to the transmitting source. By studying both the DC apparent resistivity curves and their polar plots, we can resolve the anisotropy of the ocean bottom. Forward modeling of a high-resistivity thin layer in an anisotropic half-space demonstrates that the marine DC resistivity method in shallow water is very sensitive to the resistive reservoir but is not influenced by airwaves. As such, it is very suitable for oil and gas exploration in shallowwater areas but, to date, most modeling algorithms for studying marine DC resistivity are based on isotropic models. In this paper, we investigate one-dimensional anisotropic forward modeling for marine DC resistivity method, prove the algorithm to have high accuracy, and thus provide a theoretical basis for 2D and 3D forward modeling. 展开更多
关键词 Electrical anisotropy Marine DC resistivity method Forward modeling Field continuation algorithm
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Three-dimensional land FD-CSEM forward modeling using edge finite-element method 认领 引用 被引量：5
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作者 LIU Jian-xin LIU Peng-mao TONG Xiao-zhong 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第1期131-140,共10页
A modeling tool for simulating three-dimensional land frequency-domain controlled-source electromagnetic surveys,based on a finite-element discretization of the Helmholtz equation for the electric fields,has been deve... A modeling tool for simulating three-dimensional land frequency-domain controlled-source electromagnetic surveys,based on a finite-element discretization of the Helmholtz equation for the electric fields,has been developed.The main difference between our modeling method and those previous works is edge finite-element approach applied to solving the three-dimensional land frequency-domain electromagnetic responses generated by horizontal electric dipole source.Firstly,the edge finite-element equation is formulated through the Galerkin method based on Helmholtz equation of the electric fields.Secondly,in order to check the validity of the modeling code,the numerical results are compared with the analytical solutions for a homogeneous half-space model.Finally,other three models are simulated with three-dimensional electromagnetic responses.The results indicate that the method can be applied for solving three-dimensional electromagnetic responses.The algorithm has been demonstrated,which can be effective to modeling the complex geo-electrical structures.This efficient algorithm will help to study the distribution laws of3-D land frequency-domain controlled-source electromagnetic responses and to setup basis for research of three-dimensional inversion. 展开更多
关键词 three-dimensional model frequency-domain electromagnetic method horizontal electric dipole forward modeling edge finite-element
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Three-dimensional forward modeling and response characteristics analysis of foundation pit leakage electric-field considering electrokinetic effect 认领 引用 被引量：3
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作者 Chen Yu-Feng Chen Hui +3 位作者 Deng Ju-Zhi Liu Sui-Ming Tang Wen-Wu Wang Shuo 《Applied Geophysics》 SCIE CSCD 2022年第1期117-131,146,共15页
The traditional ground direct current method is not suitable for leakage detection of underground diaphragm walls in foundation pits because of its low accuracy and poor anti-noise ability.Here,we propose a joint surf... The traditional ground direct current method is not suitable for leakage detection of underground diaphragm walls in foundation pits because of its low accuracy and poor anti-noise ability.Here,we propose a joint surface-borehole observation device for leakage electric fi eld detection to achieve rapid measurement of the electric fi eld distribution characteristics at ground level in the foundation pit,thus enabling rapid localization of leakage points.We first establish the mechanism and basic equation of the leakage electric field response by combining the electric field formed by electrokinetic effect(EK)and the stable electric fi eld formed by conduction current in a combined leakage channel.Then,the fi nite–infi nite element coupling method is used to solve the electric fi eld equation to simulate the responses of a three-dimensional foundation pit leakage model.Furthermore,we conduct numerical simulations of diff erent pit models to investigate the infl uencing factors of the detection device and response characteristics of the change in the properties of the leakage channel.The results demonstrate that the proposed joint surface-borehole observation device can effi ciently reveal anomalous potential caused by leakage,and the amplitude of the electric fi eld generated by EK can eff ectively strengthen the leakage electric fi eld signal at the leakage,thus improving detection accuracy and effi ciency. 展开更多
关键词 Foundation pit leakage 3D forward modeling Electrokinetic effect Leakage electric field
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Frequency domain wave equation forward modeling using gaussian elimination with static pivoting 认领 引用 被引量：3
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作者 Song Jian-Yong Zheng Xiao-Dong +3 位作者 Zhang Yan Xu Ji-Xiang Qin Zhen Song Xue-Juan 《Applied Geophysics》 SCIE CSCD 2011年第1期60-68,95,共9页
Frequency domain wave equation forward modeling is a problem of solving large scale linear sparse systems which is often subject to the limits of computational efficiency and memory storage.Conventional Gaussian elimi... Frequency domain wave equation forward modeling is a problem of solving large scale linear sparse systems which is often subject to the limits of computational efficiency and memory storage.Conventional Gaussian elimination cannot resolve the parallel computation of huge data.Therefore,we use the Gaussian elimination with static pivoting(GESP)method for sparse matrix decomposition and multi-source finite-difference modeling.The GESP method does not only improve the computational efficiency but also benefit the distributed parallel computation of matrix decomposition within a single frequency point.We test the proposed method using the classic Marmousi model.Both the single-frequency wave field and time domain seismic section show that the proposed method improves the simulation accuracy and computational efficiency and saves and makes full use of memory.This method can lay the basis for waveform inversion. 展开更多
关键词 Gaussian elimination with static pivoting frequency-domain wave equation forward modeling single-frequency distributed parallel
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Real-time forward modeling and inversion of logging-while-drilling electromagnetic measurements in horizontal wells 认领 引用 被引量：3
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作者 WANG Lei LIU Yingming +2 位作者 WANG Caizhi FAN Yiren WU Zhenguan 《Petroleum Exploration and Development》 2021年第1期159-168,共10页
Based on the pseudo-analytical equation of electromagnetic log for layered formation,an optimal boundary match method is proposed to adaptively truncate the encountered formation structures.An efficient integral metho... Based on the pseudo-analytical equation of electromagnetic log for layered formation,an optimal boundary match method is proposed to adaptively truncate the encountered formation structures.An efficient integral method is put forward to significantly accelerate the convergence of Sommerfeld integral.By asymptotically approximating and subtracting the first reflectionransmission waves from the scattered field,the new Sommerfeld integral method has addressed difficulties encountered by the traditional digital filtering method,such as low computational precision and limited operating range,and realized the acceleration of the computation speed of logging-while-drilling electromagnetic measurements(LWD EM).By making use of the priori information from the offset/pilot wells and interactively adjusting the formation model,the optimum initial guesses of the inversion model is determined in order to predict the nearby formation boundaries.The gradient optimization algorithm is developed and an interactive inversion system for the LWD EM data from the horizontal wells is established.The inverted results of field data demonstrated that the real-time interactive inversion method is capable of providing the accurate boundaries of layers around the wellbore from the LWD EM,and it will benefit the wellbore trajectory optimization and reservoir interpretation. 展开更多
关键词 logging-while-drilling electromagnetic measurement horizontal well real-time forward modeling interactive inversion bed boundary
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Forward modeling for“earth-ionosphere”mode electromagnetic field 认领 引用 被引量：2
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作者 LI Di-quan XIE Wei +1 位作者 DI Qing-yun WANG Miao-yue 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第9期2305-2313,共9页
A fixed artificial source(greater than 200 kW)was used and the source location was selected at a high resistivity region to ensure high emission efficiency.Some publications used the"earth-ionosphere"mode in... A fixed artificial source(greater than 200 kW)was used and the source location was selected at a high resistivity region to ensure high emission efficiency.Some publications used the"earth-ionosphere"mode in modeling the electromagnetic(EM)fields with the offset up to a thousand kilometer,and such EM fields still have a signaloise ratio of 10-20 dB.This means that a new EM method with fixed source is feasible,but in their calculation,the displacement in air was neglected.In this work,some three-layer modeling results were presented to illustrate the basic EM fields'characteristics in the near,far and waveguide areas under"earth-ionosphere"mode,and a standard is given to distinguish the boundary of near,far and waveguide areas.Due to the influence of the ionosphere and displacement current in the air,the"earth-ionosphere"mode EM fields have an extra waveguide zone,where the fields'behavior is very different from that of the far field zone. 展开更多
关键词 earth-ionosphere mode large power large offset electromagnetic field forward modeling
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3D forward modeling and response characteristics of low-resistivity overburden of the CFS-PML absorbing boundary for ground-well transient electromagnetic method 认领 引用 被引量：2
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作者 Lijuan Zhao Mingzhong Gao +3 位作者 Nengzhong Lei Hongfei Duan Weizhong Qiu Zhaoying Chen 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第12期1541-1550,共10页
This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary field.The absorption boundary condition of com... This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary field.The absorption boundary condition of complex frequency-shifted perfectly matched layer(CFS-PML)was used for truncation so that the low-frequency electromagnetic wave can be better absorbed at the model boundary.A typical three-dimensional(3D)homogeneous half-space model was established and a low-resistivity cube model was analyzed under the half-space condition.The response patterns and drivers of the low-resistivity cube model were discussed under the influence of a low-resistivity overburden.The absorption boundary conditions of CFS-PML significantly affected the low-frequency electromagnetic waves.For a low-resistivity cube around the borehole,its response curve exhibited a single-peak,and the extreme point of the curve corresponded to the center of the low-resistivity body.When the low-resistivity cube was directly below the borehole,the response curve showed three extreme values(two high and one low),with the low corresponding to the center of the low-resistivity body.The total field response of the low-resistivity overburden was stronger than that of the uniform half-space model due to the low-resistivity shielding effect of electromagnetic waves.When the receiving-transmitting distance gradually increased,the effect of the low-resistivity overburden was gradually weakened,and the response of the low-resistivity cube was strengthened.It was affected by the ratio of the overburden resistivity to the resistivity of the low-resistivity body. 展开更多
关键词 Ground-well transient electromagnetic method CFS-PML boundary condition 3D forward modeling Low-resistivity overburden
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3D seismic forward modeling from the multiphysical inversion at the Ketzin CO2 storage site 认领 引用 被引量：1
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作者 Yi-kang Zheng Chong Wang +2 位作者 Hao-hong Liang Yi-bo Wang Rong-shu Zeng 《Applied Geophysics》 SCIE CSCD 2024年第3期593-605,620,共13页
From June 2008 to August 2013,approximately 67 kt of CO2 was injected into a deep saline formation at the Ketzin pilot CO2 storage site.During injection,3D seismic surveys have been performed to monitor the migr... From June 2008 to August 2013,approximately 67 kt of CO2 was injected into a deep saline formation at the Ketzin pilot CO2 storage site.During injection,3D seismic surveys have been performed to monitor the migration of sequestered CO2.Seismic monitoring results are limited by the acquisition and signal-to-noise ratio of the acquired data.The multiphysical reservoir simulation provides information regarding the CO2 fluid behavior,and the approximated model should be calibrated with the monitoring results.In this work,property models are delivered from the multiphysical model during 3D repeated seismic surveys.The simulated seismic data based on the models are compared with the real data,and the results validate the effectiveness of the multiphysical inversion method.Time-lapse analysis shows the trend of CO2 migration during and after injection. 展开更多
关键词 Seismic forward modeling reservoir simulation CO2storage time-lapse analysis
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High Precision Time Domain Forward Modeling for Crosshole Electromagnetic Tomography 认领 引用 被引量：2
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作者 林树海 赵立英 《Journal of China University of Geosciences》 2007年第4期320-325,共6页
To improve the resolution of crosshole electromagnetic tomography, high precision of forward modeling is necessary. A pseudo-spectral time domain （PSTD） forward modeling was used to simulate electromagnetic wave pro... To improve the resolution of crosshole electromagnetic tomography, high precision of forward modeling is necessary. A pseudo-spectral time domain （PSTD） forward modeling was used to simulate electromagnetic wave propagation between two boreholes. The PSTD algorithm is based on the finite difference time domain （FDTD） method and uses the fast Fourier transform （FFT） algorithm for spatial derivatives in Maxwell＇s equations. Besides having the strongpoint of the FDTD method, the calculation precision of the PSTD algorithm is higher than that of the FDTD method under the same calculation condition. The forward modeling using the PSTD method will play an important role in enhancing the resolution of crosshole electromagnetic tomography. 展开更多
关键词 finite difference time domain method pseudo.spectral time domain algorithm forward modeling tomography.
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Forward modeling to improve seismic reflection energy of a protective coal seam based on Zoeppritz equation 认领 引用 被引量：11
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作者 TAO Wen-peng DONG Shou-huax DONG Shou-hua LI Yang 《Journal of China University of Mining and Technology》 2008年第1期46-49,共4页
In seismic exploration for coal, seismic waves are very difficult to transmit downward because of high velocity protective layers, making the reflection information very hard to receive above ground. Based on the Snel... In seismic exploration for coal, seismic waves are very difficult to transmit downward because of high velocity protective layers, making the reflection information very hard to receive above ground. Based on the Snell law and the Zoeppritz equation, we studied the relationship between the incidence angle and reflection seismic wave energy using a forward model of level media. The result shows that the seismic wave energy has a sudden increase at the critical angle. Based on the energy propagation rule, using big offset to receive the seismic wave energy under a protective layer can effectively reduce its protection effect. 展开更多
关键词 high velocity shielding layer Zoeppntz equation forward modeling
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Fast forward modeling of muon transmission tomography based on model voxelization ray energy loss projection 认领 引用
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作者 Zhang Rong-Qing Xi Zhen-Zhu +2 位作者 Liu Wei Wang He Yang Zi-Yan 《Applied Geophysics》 SCIE CSCD 2022年第3期395-408,471,共14页
To solve the problems associated with low resolution and high computational effort infinite time,this paper proposes a fast forward modeling method for muon energy loss transmission tomography based on a model voxeliza... To solve the problems associated with low resolution and high computational effort infinite time,this paper proposes a fast forward modeling method for muon energy loss transmission tomography based on a model voxelization energy loss projection algorithm.First,the energy loss equation for muon transmission tomography is derived from the Bethe–Bloch formula,and the imaging region is then dissected into several units using the model voxelization method.Thereafter,the three-dimensional(3-D)imaging model is discretized into parallel and equally spaced two-dimensional(2-D)slices using the model layering method to realize a dimensional reduction of the 3-D volume data and accelerate the forward calculation speed.Subsequently,the muon energy loss transmission tomography equation is discretized using the ray energy loss projection method to establish a set of energy loss equations for the muon penetration voxel model.Finally,the muon energy loss values at the outgoing point are obtained by solving the projection coefficient matrix of the ray length-weighted model,achieving a significant reduction in the number of muons and improving the computational efficiency.A comparison of our results with the simulation results based on the Monte Carlo method verifies the accuracy and effectiveness of the algorithm proposed in this paper.The metallic mineral identification tests show that the proposed algorithm can quickly identify high-density metallic minerals.The muon energy loss response can accurately identify the boundary of the anomalies and their spatial distribution characteristics. 展开更多
关键词 Muon transmission tomography model voxelization ray energy loss projection fast forward modeling Monte Carlo simulation
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