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Monitoring the change in horizontal stress with multi-wave time-lapse seismic response based on nonlinear elasticity theory 认领 引用 被引量：5
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作者 Fu-Bin Chen Zhao-Yun Zong Xing-Yao Yin 《Petroleum Science》 SCIE EI CAS CSCD 2023年第2期815-826,共12页
Monitoring the change in horizontal stress from the geophysical data is a tough challenge, and it has a crucial impact on broad practical scenarios which involve reservoir exploration and development, carbon dioxide (... Monitoring the change in horizontal stress from the geophysical data is a tough challenge, and it has a crucial impact on broad practical scenarios which involve reservoir exploration and development, carbon dioxide (CO2) injection and storage, shallow surface prospecting and deep-earth structure description. The change in in-situ stress induced by hydrocarbon production and localized tectonic movements causes the changes in rock mechanic properties (e.g. wave velocities, density and anisotropy) and further causes the changes in seismic amplitudes, phases and travel times. In this study, the nonlinear elasticity theory that regards the rock skeleton (solid phase) and pore fluid as an effective whole is used to characterize the effect of horizontal principal stress on rock overall elastic properties and the stress-dependent anisotropy parameters are therefore formulated. Then the approximate P-wave, SV-wave and SH-wave angle-dependent reflection coefficient equations for the horizontal-stress-induced anisotropic media are proposed. It is shown that, on the different reflectors, the stress-induced relative changes in reflectivities (i.e., relative difference) of elastic parameters (i.e., P- and S-wave velocities and density) are much less than the changes in contrasts of anisotropy parameters. Therefore, the effects of stress change on the reflectivities of three elastic parameters are reasonably neglected to further propose an AVO inversion approach incorporating P-, SH- and SV-wave information to estimate the change in horizontal principal stress from the corresponding time-lapse seismic data. Compared with the existing methods, our method eliminates the need for man-made rock-physical or fitting parameters, providing more stable predictive power. 1D test illustrates that the estimated result from time-lapse P-wave reflection data shows the most reasonable agreement with the real model, while the estimated result from SH-wave reflection data shows the largest bias. 2D test illustrates the feasibility of the proposed inversion method for estimating the change in horizontal stress from P-wave time-lapse seismic data. 展开更多
关键词 Monitoring change in horizontal stress Multi-wave reflection coefficients Nonlinear elasticity theory Time-lapse seismic data
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Multi-wave amplitude-preserved AVO modeling considering wave propagation effects 认领 引用 被引量：1
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作者 侯波 陈小宏 +1 位作者 李景叶 张孝珍 《Applied Geophysics》 SCIE CSCD 2011年第3期207-216,240,共10页
Traditional AVO forward modeling only considers the impact of reflection coefficients at the interface on seismic wave field amplitude and ignores various propagation effects. Introducing wave propagation effects incl... Traditional AVO forward modeling only considers the impact of reflection coefficients at the interface on seismic wave field amplitude and ignores various propagation effects. Introducing wave propagation effects including geometric spreading, transmission loss, attenuation into seismic wave propagation, multi-wave amplitude-preserved AVO forward modeling for horizontally layered media based on ray theory is proposed in this paper. We derived the multi-wave geometric spreading correction formulas for horizontally layered media in order to describe the geometric spreading effect of multi-wave propagation. Introducing the complex traveltime directly, we built the relationship between complex traveltime and quality factor without the help of complex velocity to describe the attenuation of viscoelastic media. Multi-wave transmission coefficients, obtained by solving the Zoeppritz equations directly, is used to describe the transmission loss. Numerical results show that the effects of geometric spreading, attenuation, and transmission loss on multi-wave amplitude varies with offset and multi-wave amplitude-preserved AVO forward modeling should consider the reconstructive effect of wave propagation on reflection amplitude. 展开更多
关键词 Amplitude-preserved AVO geometric spreading attenuation transmission loss complex traveltime multi-wave
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Dressed multi-wave mixing in a V-type four-level atomic system 认领 引用
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作者 姜彤 张彦鹏 +8 位作者 聂志强 李岭 李沛哲 沈磊剑 傅鑫 甘琛利 赵荣阔 宋建平 卢克清 《Chinese Physics B》 CAS 2007年第10期2984-2992,共9页
The dressed four- and six-wave mixings in a V-type four-level system are considered. Under two different dressed conditions, two- and three-photon resonant Autler-Townes splittings, accompanied by enhancement and supp... The dressed four- and six-wave mixings in a V-type four-level system are considered. Under two different dressed conditions, two- and three-photon resonant Autler-Townes splittings, accompanied by enhancement and suppression of wave mixing signal, are obtained analytically. Meanwhile, an electromagnetic induced transparency of multi-wave mixing is presented, which shows multiple peaks and asymmetric effects caused by one-photon, two-photon and three-photon resonances, separately. The slow light propagation multiple region of multi-wave mixing signal is also obtained. 展开更多
关键词 Autler-Townes splitting electromagnetic induced transparency multi-wave mixing
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Optical Multi-wave Mixing Process Based on Electromagnetically InducedTransparency 认领 引用
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作者 LIJia-Hua PENGJu-Cun CHENAi-Xi 《Communications in Theoretical Physics》 SCIE CAS 2004年第1期106-110,共5页
In this paper, we propose and analyze an optical multi-wave mixing scheme for the generation of coherent light in a five-level atomic system in the context of electromagnetically induced transparency. A detailed semic... In this paper, we propose and analyze an optical multi-wave mixing scheme for the generation of coherent light in a five-level atomic system in the context of electromagnetically induced transparency. A detailed semiclassical study of the propagation of generated mixing and probe fields is demonstrated. The analytical dependence of the generated mixing field on the probe field and the respective detuning is predicted. Such a nonlinear optical process can be used for generating short-wavelength radiation at low pump intensities. 展开更多
关键词 optical multi-wave mixing electromagnetically induced transparency Rabi frequency
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Reservoir prediction using multi-wave seismic attributes 认领 引用 被引量：2
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作者 Ye Yuan Yang Liu +2 位作者 Jingyu Zhang Xiucheng Wei Tiansheng Chen 《Earthquake Science》 CSCD 2011年第4期373-389,共17页
The main problems in seismic attribute technology are the redundancy of data and the uncertainty of attributes, and these problems become much more serious in multi-wave seismic exploration. Data redundancy will incre... The main problems in seismic attribute technology are the redundancy of data and the uncertainty of attributes, and these problems become much more serious in multi-wave seismic exploration. Data redundancy will increase the burden on interpreters, occupy large computer memory, take much more computing time, conceal the effective information, and especially cause the ＂curse of dimension＂. Uncertainty of attributes will reduce the accuracy of rebuilding the relationship between attributes and geological significance. In order to solve these problems, we study methods of principal component analysis （PCA）, independent component analysis （ICA） for attribute optimization and support vector machine （SVM） for reservoir prediction. We propose a flow chart of multi-wave seismic attribute process and further apply it to multi-wave seismic reservoir prediction. The processing results of real seismic data demonstrate that reservoir prediction based on combination of PP- and PS-wave attributes, compared with that based on traditional PP-wave attributes, can improve the prediction accuracy. 展开更多
关键词 seismic attribute multi-wave exploration independent component analysis supportvector machine reservoir prediction
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STABILITY OF STEADY MULTI-WAVE CONFIGURATIONS FOR THE FULL EULER EQUATIONS OF COMPRESSIBLE FLUID FLOW 认领 引用 被引量：2
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作者 Gui-Qiang G.CHEN Matthew RIGBY 《Acta Mathematica Scientia》 SCIE CSCD 2018年第5期1485-1514,共30页
We are concerned with the stability of steady multi-wave configurations for the full Euler equations of compressible fluid flow. In this paper, we focus on the stability of steady four-wave configurations that are the... We are concerned with the stability of steady multi-wave configurations for the full Euler equations of compressible fluid flow. In this paper, we focus on the stability of steady four-wave configurations that are the solutions of the Riemann problem in the flow direction, consisting of two shocks, one vortex sheet, and one entropy wave, which is one of the core multi-wave configurations for the two-dimensional Euler equations. It is proved that such steady four-wave configurations in supersonic flow are stable in structure globally, even under the BV perturbation of the incoming flow in the flow direction. In order to achieve this, we first formulate the problem as the Cauchy problem （initial value problem） in the flow direction, and then develop a modified Glimm difference scheme and identify a Glimm-type functional to obtain the required BV estimates by tracing the interactions not only between the strong shocks and weak waves, but also between the strong vortex sheet/entropy wave and weak waves. The key feature of the Euler equations is that the reflection coefficient is always less than 1, when a weak wave of different family interacts with the strong vortex sheet/entropy wave or the shock wave, which is crucial to guarantee that the Glimm functional is decreasing. Then these estimates are employed to establish the convergence of the approximate solutions to a global entropy solution, close to the background solution of steady four-wave configuration. 展开更多
关键词 stability multi-wave configuration vortex sheet entropy wave shock wave BV perturbation full Euler equations steady wave interactions Glimm scheme
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Multi-Waves,Breathers,Periodic and Cross-Kink Solutions to the(2+1)-Dimensional Variable-Coefficient Caudrey-Dodd-Gibbon-Kotera-Sawada Equation 认领 引用
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作者 LIU Dong JU Xiaodong +2 位作者 ILHAN Onur Alp MANAFIAN Jalil ISMAEL Hajar Farhan 《Journal of Ocean University of China》 SCIE CAS CSCD 2021年第1期35-44,共10页
The present article deals with multi-waves and breathers solution of the(2+1)-dimensional variable-coefficient CaudreyDodd-Gibbon-Kotera-Sawada equation under the Hirota bilinear operator method.The obtained solutions... The present article deals with multi-waves and breathers solution of the(2+1)-dimensional variable-coefficient CaudreyDodd-Gibbon-Kotera-Sawada equation under the Hirota bilinear operator method.The obtained solutions for solving the current equation represent some localized waves including soliton,solitary wave solutions,periodic and cross-kink solutions in which have been investigated by the approach of the bilinear method.Mainly,by choosing specific parameter constraints in the multi-waves and breathers,all cases the periodic and cross-kink solutions can be captured from the 1-and 2-soliton.The obtained solutions are extended with numerical simulation to analyze graphically,which results in 1-and 2-soliton solutions and also periodic and cross-kink solutions profiles.That will be extensively used to report many attractive physical phenomena in the fields of acoustics,heat transfer,fluid dynamics,classical mechanics,and so on.We have shown that the assigned method is further general,efficient,straightforward,and powerful and can be exerted to establish exact solutions of diverse kinds of fractional equations originated in mathematical physics and engineering.We have depicted the figures of the evaluated solutions in order to interpret the physical phenomena. 展开更多
关键词 variable-coefficient Caudrey-Dodd-Gibbon-Kotera-Sawada equation Hirota bilinear operator method soliton multi-waves and breathers periodic and cross-kink solitray wave solutions
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An ultrasonic multi-wave focusing and imaging method for linear phased arrays 认领 引用
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作者 Yu-Xiang Dai Shou-Guo Yan Bi-Xing Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期303-310,共8页
To overcome the inherent limits of traditional single wave imaging for nondestructive testing,the multi-wave focusing and imaging method is thoroughly studied.This method makes the compressional waves and shear waves ... To overcome the inherent limits of traditional single wave imaging for nondestructive testing,the multi-wave focusing and imaging method is thoroughly studied.This method makes the compressional waves and shear waves focused in both emission and reception processes,which strengthens the focusing energy and improves the signal-to-noise ratio of received signals.A numerical model is developed to study the characteristics of a multi-wave focusing field.It is shown that the element width approaching 0.8 wavelengths of shear waves can keep a balance between the radiation energy of two waves,which can achieve a desirable multi-wave focusing performance.And an experiment using different imaging methods for a linear phased array is performed.It can be concluded that due to the combination of the propagation and reflection characteristics of two waves,the multi-wave focusing and imaging method can significantly improve the imaging distinguishability of defects and expand the available sweeping range to a sector of-650 to 65°. 展开更多
关键词 multi-wave focusing ultrasonic imaging phased array non-destructive testing
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Multi-wave forward modeling of a reservoir and AVO analysis 认领 引用
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作者 ZHOU Huailai LI Luming +2 位作者 LUO Shengxian WANG Xiuling BI Lifei 《Mining Science and Technology》 2010年第5期758-764,共7页
In the process of accurate interpretation of multi-wave seismic data,we wanted to solve the problem of multi-wave information recognition.Based on techniques of elastic wave forwarding,targeting the geological model o... In the process of accurate interpretation of multi-wave seismic data,we wanted to solve the problem of multi-wave information recognition.Based on techniques of elastic wave forwarding,targeting the geological model of a reservoir of an oil field exploration area,we used a high-order staggered-grid difference technology to simulate many shots of seismic records of nonzero offset shots,implemented multi-wave seismic data processing to acquire the CMP of P waves and converted waves,NMO traces of CCP pre stacks,including AVA information and superposition profiles.Based on the AVA calculation of the model,the layer parameters of the model and the forwarding wave field relations of the P-S wave,we also compared and studied the correspondence between P waves and converted waves.The results of our analysis show that the results from simulation and from the AVO analysis are consistent.Significant wave field differences between P waves and converted waves in the same reservoir were found,which are helpful in recognizing and interpreting the multi-wave information in this area.We made use of the multi-wave data to provide the important guidelines for reservoir prediction. 展开更多
关键词 multi-wave and multi-component wave field characteristics layer modeling forward staggered-grid
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A simple multi-wave algorithm for the uncapacitated facility location problem 认领 引用 被引量：1
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作者 Fred GLOVER Said HANAFI +1 位作者 Oualid GUEMRI Igor CREVITS 《Frontiers of Engineering Management》 2018年第4期451-465,共15页
The multi-wave algorithm(Glover,2016)integrates tabu search and strategic oscillation utilizing repeated waves(nested iterations)of constructive search or neighborhood search.We propose a simple multi-wave algorithm f... The multi-wave algorithm(Glover,2016)integrates tabu search and strategic oscillation utilizing repeated waves(nested iterations)of constructive search or neighborhood search.We propose a simple multi-wave algorithm for solving the Uncapacitated Facility Location Problem(UFLP)to minimize the combined costs of selecting facilities to be opened and of assigning each customer to an opened facility in order to meet the customers'demands.The objective is to minimize the overall cost including the costs of opening facilities and the costs of allocations.Our experimental tests on a standard set of benchmarks for this widely-studied class of problems show that our algorithm outperforms all previous methods. 展开更多
关键词 discrete optimization UFLP multi-wave optimization strategic oscillation tabu search
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Magnetic-field-sensitive multi-wave interference 认领 引用 被引量：2
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作者 Wenhua Yan Xudong Ren +2 位作者 Wenjie Xu Zhongkun Hu Minkang Zhou 《Frontiers of physics》 SCIE CSCD 2023年第5期201-207,共7页
We report an experimental study of magnetic-field-sensitive multi-wave interference,realized in a three-wave RF-atom system.In the F=1 hyperfine level of the 87Rb 52S1/2 ground state,Ramsey fringes were obser... We report an experimental study of magnetic-field-sensitive multi-wave interference,realized in a three-wave RF-atom system.In the F=1 hyperfine level of the 87Rb 52S1/2 ground state,Ramsey fringes were observed via the spin-selective Raman detection.A decrease in the fringe contrast was observed with increasing free evolution time.The maximum evolution time for observable fringe contrasts was investigated at different atom temperatures,under free-falling and trapped conditions.As the main interest of the Ramsey method,the improvement in magnetic field resolution is observed with an increase of evolution time T up to 3 ms and with the measurement resolution reaching 0.85 nT.This study paves the way for precision magnetic field measurements based on cold atoms. 展开更多
关键词 atom interferometer magnetometer cold atom device multi-wave interference
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Global Stability of Multi-wave Configurations for the Compressible Non-isentropic Euler System 认领 引用
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作者 Min DING 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2021年第6期921-952,共32页
This paper is contributed to the structural stability of multi-wave configurations to Cauchy problem for the compressible non-isentropic Euler system with adiabatic exponentγ∈(1,3].Given some small BV perturbations ... This paper is contributed to the structural stability of multi-wave configurations to Cauchy problem for the compressible non-isentropic Euler system with adiabatic exponentγ∈(1,3].Given some small BV perturbations of the initial state,the author employs a modified wave front tracking method,constructs a new Glimm functional,and proves its monotone decreasing based on the possible local wave interaction estimates,then establishes the global stability of the multi-wave configurations,consisting of a strong 1-shock wave,a strong 2-contact discontinuity,and a strong 3-shock wave,without restrictions on their strengths. 展开更多
关键词 Structural stability Multi-wave configuration Shock Contact discontinuity Compressible non-isentropic Euler system Wave front tracking method
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Efficient collaborative planning for carrier-borne aircraft dispatch and recovery via hierarchical reinforcement learning 认领 引用
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作者 Shaohui ZHANG Qiuying HAN +3 位作者 Qingshun WU Di ZHANG Yafei LI Mingliang XU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期528-540,共13页
Carrier-borne aircraft are the primary formidable assets in aircraft carrier combat,and their sortie rate is a pivotal metric for evaluating the carrier's combat capability.Enhancing the efficiency of aircraft sup... Carrier-borne aircraft are the primary formidable assets in aircraft carrier combat,and their sortie rate is a pivotal metric for evaluating the carrier's combat capability.Enhancing the efficiency of aircraft support operations scheduling is a significant means to improve the sortie rate,where the central issue is to assign multi-wave aircraft to support stations according to the flight plan,and then obtain support resources for completing support operations.The existing studies primarily focus on considering partial operation processes(e.g.,ammunition transfer,disturbance handling,support personnel deployment,and deck arrangement),and lack modeling of the entire process of multi-wave aircraft support.In this paper,we investigate the multi-wave Aircraft Dispatch and Recovery Planning(ADRP)problem that aims to reasonably plan the operation processes,stations and resources of multi-wave aircraft with the goal of minimizing the total support operation time,and present a three-layer solution framework based on hierarchical reinforcement learning to address it.Specifically,we first abstract the multi-wave aircraft support operation planning process into the process layer,station layer and resource layer,and model it as a Decentralized Partially Observable Markov Decision Process(Dec-POMDP).Then,we propose a three-layer solution framework based on hierarchical reinforcement learning to solve the ADRP problem.To further improve planning results from long-term and global perspective,we design an inter-layer communication mechanism to allow efficient information exchange between stations.Extensive experimental results demonstrate that our proposed approach can achieve a high-quality operating schedule while meeting real-time demands. 展开更多
关键词 Carrier-borne aircraft Multi-wave support operations Multi-agent systems Hierarchical reinforcement learning Markov processes
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Research on model testing of a new ultrasonic multi-wav detecting method 认领 引用 被引量：1
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作者 王兵团 冯永革 +3 位作者 庞坤 崔建英 卓琳 陈立成 《Acta Seismologica Sinica(English Edition)》 2006年第1期108-112,共5页
The traditional crack exploring method with echo （reflected wave） in metals is called the ＂single-wave detecting method＂ that uses a probe of single weight. This method is not able to detect directly the size and ... The traditional crack exploring method with echo （reflected wave） in metals is called the ＂single-wave detecting method＂ that uses a probe of single weight. This method is not able to detect directly the size and shape of the crack and the result can only be obtained by relative comparison, that is to compare the echo amplitudes of the unknown quantity （crack） with the known quantity （regular artificial crack） to determine the equivalent size and shape of a certain crack. 展开更多
关键词 similarity multi-wave multiple seismic phases multi-wave 3-dimensional Imaging
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基于超声导波多域稀疏重构的复合材料损伤检测方法 认领 引用 被引量：2
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作者 高飞 李从昱 +1 位作者 刘璐 孔凡金 《复合材料学报》 EI CAS CSCD 北大核心 2026年第1期549-558,共10页
航空航天装备结构在制造和服役过程中易受工艺、环境、载荷等多因素作用,易产生多种不易辨识的损伤,严重威胁装备的服役安全。超声导波是最具应用潜力的薄壁检测方法之一,但对于频散曲线和参考信号的依赖是其检测应用的主要挑战。本文... 航空航天装备结构在制造和服役过程中易受工艺、环境、载荷等多因素作用,易产生多种不易辨识的损伤,严重威胁装备的服役安全。超声导波是最具应用潜力的薄壁检测方法之一,但对于频散曲线和参考信号的依赖是其检测应用的主要挑战。本文围绕无先验状态下的超声导波信息提取与损伤检测,利用少量随机测点,建立了超声导波的感知矩阵方程,通过频率-波数域稀疏重构方法提取直达波蕴含的导波频散信息,实现了超声导波频散曲线准确重构。在此基础上,基于超声导波传播模型构建了有效检测区域的导波传播数据字典集,通过时空稀疏重构方法提取导波散射波对应空间信息,实现损伤的检测与定位。实验和仿真结果表明,所提出的方法重构的频散曲线误差在5%以内,且对损伤的定位误差小于1 cm。相比于传统导波检测方法,多域稀疏重构方法无需频散特性和参考信号,对超声导波的检测能力和应用广度有着重要的意义。 展开更多
关键词 超声导波 多域表达 稀疏重构 无损检测 压缩感知
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东海小多道地震数据多次波压制方法研究 认领 引用
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作者 王小杰 刘鸿 +2 位作者 杨睿 刘欣欣 杨佳佳 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2026年第3期200-209,共10页
东海小多道地震数据受海面、海底以及新近系底界面等强反射界面的影响,普遍发育多阶多次波干扰,使中深部地震反射信号被掩盖,进而影响了中深部的成像品质。小多道地震数据道数少、覆盖次数低,因此基于速度或者偏移距时差的常规方法无法... 东海小多道地震数据受海面、海底以及新近系底界面等强反射界面的影响,普遍发育多阶多次波干扰,使中深部地震反射信号被掩盖,进而影响了中深部的成像品质。小多道地震数据道数少、覆盖次数低,因此基于速度或者偏移距时差的常规方法无法对多次波进行有效压制。基于此,本文采用组合多次波压制方法对东海小多道地震数据进行处理。首先采用曲波域多次波压制方法,该方法是在常规GSMP方法基础上,在曲波域对多次波模型作进一步的优化,得到更加精确的多次波模型,再进行多次波的压制;针对残留的多次波,根据多次波的频率特征和振幅特征,采用基于“分区”的剩余多次波压制方法进行压制。结果发现,组合多次波的压制效果较好,多阶的多次波压制的比较干净,多次波覆盖下的有效信号得以凸显,剖面整体的信噪比和质量得到了提升,有利于后期地震数据的解释和应用。 展开更多
关键词 小多道数据 多次波 曲波变换 剩余多次波 信噪比
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基于多目阵列相机的大型滑坡涌浪PIV分析系统 认领 引用 被引量：1
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作者 李鹏程 秦臻 +3 位作者 黄波林 董星辰 秦盼盼 张鹏 《水利水电科技进展》 CSCD 北大核心 2026年第3期73-79,共7页
为解决滑坡涌浪三维缩尺试验中大视野与高分辨率流场测量难以兼顾的问题,建立了基于多目阵列相机的大型滑坡涌浪PIV分析系统,采用了广角畸变校正、不规则图像四角点映射、图像快速融合拼接以及大型滑坡涌浪流场PIV分析等4项关键技术,实... 为解决滑坡涌浪三维缩尺试验中大视野与高分辨率流场测量难以兼顾的问题,建立了基于多目阵列相机的大型滑坡涌浪PIV分析系统,采用了广角畸变校正、不规则图像四角点映射、图像快速融合拼接以及大型滑坡涌浪流场PIV分析等4项关键技术,实现了对三维缩尺试验下滑坡涌浪运动过程的观测与PIV分析。以大型三维王家山滑坡涌浪物理模型试验为例进行了滑坡涌浪PIV分析,验证了大型滑坡涌浪PIV分析系统的精确度与可行性,可为进一步研究三维缩尺试验下滑坡涌浪的运动过程提供借鉴。 展开更多
关键词 滑坡涌浪 多目阵列相机 PIV分析 三维缩尺试验
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多波地震勘探技术在隐蔽砂体储层识别中的应用——以四川盆地ZT地区沙溪庙组为例 认领 引用
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作者 彭浩天 戴隽成 +3 位作者 魏玮 何宗强 孔令霞 屠志慧 《天然气勘探与开发》 CAS 2026年第4期41-52,共12页
为了解决四川盆地ZT地区侏罗系中统沙溪庙组一段致密河道砂岩气藏中“隐蔽性”砂体纵向多期叠置、横向强非均质性及单一纵波振幅信息所导致的储层识别困难问题,有效提升研究区河道砂体成像质量及优质砂体储层预测精度,基于三维三分量地... 为了解决四川盆地ZT地区侏罗系中统沙溪庙组一段致密河道砂岩气藏中“隐蔽性”砂体纵向多期叠置、横向强非均质性及单一纵波振幅信息所导致的储层识别困难问题,有效提升研究区河道砂体成像质量及优质砂体储层预测精度,基于三维三分量地震资料,采用多信息融合近地表速度建模、转换波有效信号保真恢复、OVT域各向异性偏移等关键技术,开展了多波地震资料保真宽频成像研究工作。研究结果表明:(1)去噪与近地表Q补偿技术显著恢复了转换波有效信号,增强了目的层地震资料的波场特征;(2)多波一体化偏移速度建模技术实现了纵波与转换波的联合速度分析,将大规模转换波数据处理效率提升30%以上;(3)转换横波成果资料中,波峰恒定指示沙一段“隐蔽型”河道砂体顶界,消除了纵波中低阻抗砂体表现为“亮点”、中阻抗砂体表现为“暗点”导致的储层判别歧义。结论认为,所建立的多波保真宽频成像处理流程,显著提高了ZT地区致密河道砂体的预测精度与边界识别能力,为同类隐蔽性岩性气藏的勘探提供了有效的技术借鉴。 展开更多
关键词 四川盆地 侏罗系中统沙溪庙组 多波处理 隐蔽砂体 静校正 多波联合
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面向时间窗耦合任务的舰基直升机群轮转作业调度方法 认领 引用
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作者 吴浩南 韩啸华 +2 位作者 韩维 刘洁 苏析超 《航空学报》 EI CAS CSCD 北大核心 2026年第14期270-289,共20页
舰基直升机群是两栖作战中立体投送、火力支援与战场侦察的核心力量,其轮转作业调度效率直接决定作战任务成败。为破解甲板资源受限下作战与保障多耦合任务协同调度难题,提升机群全流程作业的时效性与精准性,针对时间窗耦合任务的轮转... 舰基直升机群是两栖作战中立体投送、火力支援与战场侦察的核心力量,其轮转作业调度效率直接决定作战任务成败。为破解甲板资源受限下作战与保障多耦合任务协同调度难题,提升机群全流程作业的时效性与精准性,针对时间窗耦合任务的轮转调度问题开展研究。首先,系统地梳理了舰基直升机群调运、保障、出动、任务协同、回收、重组编组及再出动全流程约束条件,聚焦任务时间窗耦合特性,以最小化机群任务时间和资源配置数目为目标,构建非规则轮转作业调度模型。其次,设计融合种群分工优化策略的多目标麻雀搜索算法(MOSSA),采用4段编码架构,引入改进逆向PSGS调度生成机制,结合启发式规则实现资源与点位精准匹配;通过快速非支配排序与拥挤度距离划分种群角色,同步开展全局搜索与局部优化,实现工序与资源的高效解耦。最后,构建4个多任务协同优化场景,对比改进逆向调度与传统正向调度机制,并将MOSSA与NSGA-Ⅱ、SPEA2及MOPSO算法进行性能对比。实验结果表明:所提模型与算法可有效适配多波次出动回收协同任务需求,改进逆向调度机制能够精准匹配任务时间窗。在原始案例中,MOSSA求得的最短轮转保障时间为436 min,较NSGA-Ⅱ、SPEA2和MOPS分别缩短9.7%、12.3%和6.6%;在10次独立实验中,MOSSA的求解均值较NSGA-Ⅱ降低13.2%,标准差较MOPSO降低28.4%,并在拓展的多任务耦合场景下展现出更优的寻优精度与求解稳定性。 展开更多
关键词 多目标麻雀搜索算法 逆向PSGS调度机制 非规则轮转 任务时间窗 多波次
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考虑多阶瑞雷波的微动探测方法及其应用 认领 引用
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作者 杜亚楠 徐佩芬 李传金 《工程地球物理学报》 2026年第4期128-135,共8页
近年来,工程地球物理勘探领域发展迅速,微动探测技术因其高效、非侵入性和高分辨率等优点受到了广泛关注。然而,传统微动探测方法依赖基阶瑞雷波频散特性反演地下横波速度结构,这在复杂地层条件下容易导致分辨率不足和深度成像误差较大... 近年来,工程地球物理勘探领域发展迅速,微动探测技术因其高效、非侵入性和高分辨率等优点受到了广泛关注。然而,传统微动探测方法依赖基阶瑞雷波频散特性反演地下横波速度结构,这在复杂地层条件下容易导致分辨率不足和深度成像误差较大的问题。为了解决这些问题,本文提出了一种多阶瑞雷波反演的微动探测技术。首先,采用扩展空间自相关法从实测微动数据中提取视频散曲线;随后,构建了同时考虑基阶与高阶瑞雷波频散的正演模型,开展多阶瑞雷波反演。数值模拟结果表明,在针对含低速软弱夹层与含高速硬夹层的典型地层模型中,高阶瑞雷波在特定频段能量占比显著高于基阶波,导致视相速度频散曲线呈现“之”字形折返特征。以上海市某地下空间探测工程为实例验证,基于多阶瑞雷波视频散曲线反演方法能够精确刻画浅部软硬夹层结构,与钻孔揭露数据的误差控制在4%以内。该方法充分利用微动信号中的多模态信息,显著提高了复杂地层浅部横波速度结构反演的精度和分辨率,为城市地下空间开发提供了高分辨率的探测技术支持。 展开更多
关键词 微动探测 多阶瑞雷波 视频散曲线 扩展空间自相关法
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