The ancient structure characteristic,correlation of the oil and the hydrocarbon source rock characteristics,hydrocarbon migration trace,types and conditions of traps,migration passages and characteristic of hydrocarbo...The ancient structure characteristic,correlation of the oil and the hydrocarbon source rock characteristics,hydrocarbon migration trace,types and conditions of traps,migration passages and characteristic of hydrocarbon accumulation are researched in this paper.It is shown through the analysis that two main large tectonic activities after the Early Hercynian orogeny resulted in different tectonic patterns in the study area.Two main hydrocarbon infills occurred in the Donghetang Formation,the first occurred in the Early Hercynian resulting in the ancient hydrocarbon accumulation in the northern Tahe,the second infill was a large amount that occurred in places beneficial for hydrocarbon accumulation,such as structural traps and structural-stratigraphic traps formed in the Early Himalayan orogeny after migration along the faults through source rocks and other passages.Before the earlier period of the Himalayan orogeny,the petroleum mainly migrated to the north,whereas petroleum migrated to the south and southeast because of the structural reverse in the Himalayan orogeny,so the middle and later period of the Himalayan orogeny is the key period for hydrocarbon accumulation.The model of"oil generation formed early,hydrocarbon accumulation controlled by the faults through source rocks and structures formed late"is proposed.It is pointed out that the south of the research area is currently the beneficial district for hydrocarbon accumulation, which provides the basis for future petroleum exploration.展开更多
Based on geochemical data from natural gas samples across spring water systems and sedimentary basins,including Songliao,Bohai Bay,Sanshui,Sichuan,Ordos,Tarim and Ying-Qiong,this paper systematically compares the geoc...Based on geochemical data from natural gas samples across spring water systems and sedimentary basins,including Songliao,Bohai Bay,Sanshui,Sichuan,Ordos,Tarim and Ying-Qiong,this paper systematically compares the geochemical compositions of abiogenic versus biogenic gases.Emphasis is placed on the diagnostic signatures of abiogenic gases in terms of gas composition,and carbon,hydrogen and helium isotopes.The main findings are as follows.(1)In hydrothermal spring systems,abiogenic alkane gases are extremely scarce.Methane concentrations are typically less than 1%,with almost no detectable C2+hydrocarbons.The gas is dominantly composed of CO2,while N2is the major component in a few samples.(2)Abiogenic alkane gases display distinct isotopic signatures,including enriched methane carbon isotopic compositions(δ13C1>-25‰generally),complete carbon isotopic reversal(δ13C1>δ13C2>δ13C3>δ13C4),and enriched helium isotope(R/Ra>0.5,CH4/3He≤106generally).(3)The hydrogen isotopic composition of abiogenic alkane gases may be characterized by a positive sequence(δD1δD2>δD3),or a V-shaped distribution(δD1>δD2,δD2<δD3).The hydrogen isotopic compositions of methane generally show limited variation(about 9‰),possibly due to hydrogen isotopic exchange with connate water.(4)In terms of identifying gas origin,CH4/3He-R/Ra andδ13CCO2-R/Ra charts are more effective than CO2/3He-R/Ra chart.These new geological insights provide theoretical clues and diagnostic charts for the genetic identification of natural gas and further research on abiogenic gases.展开更多
全球土壤盐渍化问题日益严重,导致土壤生产力下降、植物生长受抑,不仅威胁粮食安全、造成经济损失,更严重威胁农业可持续发展和生态平衡。膨润土保水剂因其独特的膨胀性、高吸水性和离子交换性,可通过改善土壤团聚体结构、降低土壤容重...全球土壤盐渍化问题日益严重,导致土壤生产力下降、植物生长受抑,不仅威胁粮食安全、造成经济损失,更严重威胁农业可持续发展和生态平衡。膨润土保水剂因其独特的膨胀性、高吸水性和离子交换性,可通过改善土壤团聚体结构、降低土壤容重、调控水盐迁移、减少盐分表聚与土壤板结,缓解盐渍化危害,为土壤微生物和植物提供更适宜的生长环境,因此被认为是一种具有良好应用前景的土壤改良材料。本研究采用文献计量的方法,系统分析了Web of Science及知网中与膨润土保水剂相关的文献,总结了膨润土保水剂的结构特性及其对盐渍土水盐迁移的影响,分析了其在改善土壤结构、提升养分利用效率、促进微生物活性及作物增产等方面的应用效果,探讨了膨润土保水剂的应用潜力与局限性,展望未来研发趋势。研究结果表明,膨润土保水剂可使盐碱地土壤团聚体稳定性提高15%~30%,作物氮磷钾吸收量增加20%~40%。其“吸水-抑盐-生态友好”协同优势显著,是盐碱地改良的潜力材料。未来研究可侧重于膨润土保水剂复合改性与多功能协同应用,进一步提升其保水、调盐及养分协同调控能力,以期为盐碱地低成本、环境友好型改良和农业可持续发展提供理论支持。展开更多
基金supported by State Key Laboratory of Petroleum Reservoir Geology and Reservoir Engineering and partly by Northwest Bureau of Petroleum of SINOPEC
摘要The ancient structure characteristic,correlation of the oil and the hydrocarbon source rock characteristics,hydrocarbon migration trace,types and conditions of traps,migration passages and characteristic of hydrocarbon accumulation are researched in this paper.It is shown through the analysis that two main large tectonic activities after the Early Hercynian orogeny resulted in different tectonic patterns in the study area.Two main hydrocarbon infills occurred in the Donghetang Formation,the first occurred in the Early Hercynian resulting in the ancient hydrocarbon accumulation in the northern Tahe,the second infill was a large amount that occurred in places beneficial for hydrocarbon accumulation,such as structural traps and structural-stratigraphic traps formed in the Early Himalayan orogeny after migration along the faults through source rocks and other passages.Before the earlier period of the Himalayan orogeny,the petroleum mainly migrated to the north,whereas petroleum migrated to the south and southeast because of the structural reverse in the Himalayan orogeny,so the middle and later period of the Himalayan orogeny is the key period for hydrocarbon accumulation.The model of"oil generation formed early,hydrocarbon accumulation controlled by the faults through source rocks and structures formed late"is proposed.It is pointed out that the south of the research area is currently the beneficial district for hydrocarbon accumulation, which provides the basis for future petroleum exploration.
基金Supported by PetroChina Science and Technology Research and Technology Development Project(2021DJ0502)Open Research Project of Key Laboratory of Shale Gas Resources Exploration,Ministry of Natural Resources(Chongqing Institute of Geology and Mineral Resources)(KLSGE-2023).
摘要Based on geochemical data from natural gas samples across spring water systems and sedimentary basins,including Songliao,Bohai Bay,Sanshui,Sichuan,Ordos,Tarim and Ying-Qiong,this paper systematically compares the geochemical compositions of abiogenic versus biogenic gases.Emphasis is placed on the diagnostic signatures of abiogenic gases in terms of gas composition,and carbon,hydrogen and helium isotopes.The main findings are as follows.(1)In hydrothermal spring systems,abiogenic alkane gases are extremely scarce.Methane concentrations are typically less than 1%,with almost no detectable C2+hydrocarbons.The gas is dominantly composed of CO2,while N2is the major component in a few samples.(2)Abiogenic alkane gases display distinct isotopic signatures,including enriched methane carbon isotopic compositions(δ13C1>-25‰generally),complete carbon isotopic reversal(δ13C1>δ13C2>δ13C3>δ13C4),and enriched helium isotope(R/Ra>0.5,CH4/3He≤106generally).(3)The hydrogen isotopic composition of abiogenic alkane gases may be characterized by a positive sequence(δD1δD2>δD3),or a V-shaped distribution(δD1>δD2,δD2<δD3).The hydrogen isotopic compositions of methane generally show limited variation(about 9‰),possibly due to hydrogen isotopic exchange with connate water.(4)In terms of identifying gas origin,CH4/3He-R/Ra andδ13CCO2-R/Ra charts are more effective than CO2/3He-R/Ra chart.These new geological insights provide theoretical clues and diagnostic charts for the genetic identification of natural gas and further research on abiogenic gases.
摘要全球土壤盐渍化问题日益严重,导致土壤生产力下降、植物生长受抑,不仅威胁粮食安全、造成经济损失,更严重威胁农业可持续发展和生态平衡。膨润土保水剂因其独特的膨胀性、高吸水性和离子交换性,可通过改善土壤团聚体结构、降低土壤容重、调控水盐迁移、减少盐分表聚与土壤板结,缓解盐渍化危害,为土壤微生物和植物提供更适宜的生长环境,因此被认为是一种具有良好应用前景的土壤改良材料。本研究采用文献计量的方法,系统分析了Web of Science及知网中与膨润土保水剂相关的文献,总结了膨润土保水剂的结构特性及其对盐渍土水盐迁移的影响,分析了其在改善土壤结构、提升养分利用效率、促进微生物活性及作物增产等方面的应用效果,探讨了膨润土保水剂的应用潜力与局限性,展望未来研发趋势。研究结果表明,膨润土保水剂可使盐碱地土壤团聚体稳定性提高15%~30%,作物氮磷钾吸收量增加20%~40%。其“吸水-抑盐-生态友好”协同优势显著,是盐碱地改良的潜力材料。未来研究可侧重于膨润土保水剂复合改性与多功能协同应用,进一步提升其保水、调盐及养分协同调控能力,以期为盐碱地低成本、环境友好型改良和农业可持续发展提供理论支持。