南黄海盆地南部坳陷三叠纪以来的构造演化与油气成藏
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摘要
目前已在陆上苏北盆地发现多个中古生界气田,但在其东侧的南黄海盆地南部坳陷一直没有获得勘探突破。为了寻找后备油气基地,利用2Dmove软件对研究区内典型地震剖面进行了平衡剖面分析,恢复了三叠纪以来的构造演化过程,在此基础上分析了三叠系油气成藏条件,总结出了有利成藏模式。结果表明:南部坳陷三叠纪以来共经历了4期构造演化过程;研究区东部三叠系烃源岩仅发生过一次生烃,而中西部可能存在二次生烃;古近纪Ed—Es阶段构造活动剧烈,是所有圈闭的最终定型期,同时也是早期所形成油气藏的强烈破坏时期;综合油气成藏条件分析认为研究区主要存在3种有利油气成藏模式。研究认为,南黄海盆地南部坳陷的三叠系油气成藏规律主要受构造演化所控制,研究区东部和中西部发育不同的油气成藏模式。
At present several gas fields have been discovered in the Mesozoic-Paleozoic of the Subei Basin,but exploration has not got breakthrough in the southern depression of the South Yellow Sea Basin which is located to the east of Subei Basin.In order to open up the hydrocarbon reserve,we have conducted balanced cross-section analysis of typical seismic section in the study area using 2Dmove software and recovered the tectonic evolution since Triassic.On this basis,we have analyzed hydrocarbon accumulation conditions and concluded the favorable accumulation models.The studying area has undergone four stages of basin evolution since Triassic.Triassic source rocks only experienced one hydrocarbon generation in eastern part of the study area,while the source rocks may experience secondary hydrocarbon generation in the midwest part.Tectonic activity was intense in Ed-Es stage of Paleogene when all the traps fell into final pattern and reservoirs formed in the early stage were strongly destroyed.By the analysis of Triassic hydrocarbon accumulation in the Southern Depression,we proposed three accumulation models.Through the above research we know that hydrocarbon accumulation of Triassic in Southern Depression of the South Yellow Sea Basin is mainly controlled by the tectonic evolution.Accumulation models in the eastern part of the study area were different from those in the mid-west part.
At present several gas fields have been discovered in the Mesozoic-Paleozoic of the Subei Basin,but exploration has not got breakthrough in the southern depression of the South Yellow Sea Basin which is located to the east of Subei Basin.In order to open up the hydrocarbon reserve,we have conducted balanced cross-section analysis of typical seismic section in the study area using 2Dmove software and recovered the tectonic evolution since Triassic.On this basis,we have analyzed hydrocarbon accumulation conditions and concluded the favorable accumulation models.The studying area has undergone four stages of basin evolution since Triassic.Triassic source rocks only experienced one hydrocarbon generation in eastern part of the study area,while the source rocks may experience secondary hydrocarbon generation in the midwest part.Tectonic activity was intense in Ed-Es stage of Paleogene when all the traps fell into final pattern and reservoirs formed in the early stage were strongly destroyed.By the analysis of Triassic hydrocarbon accumulation in the Southern Depression,we proposed three accumulation models.Through the above research we know that hydrocarbon accumulation of Triassic in Southern Depression of the South Yellow Sea Basin is mainly controlled by the tectonic evolution.Accumulation models in the eastern part of the study area were different from those in the mid-west part.
引文
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[19]Zhang Pengfei,Chen Shiyue,Yang Huaiyu,et al.Research of mixed model and developmental characteristic of the clastic-carbonatite diamictite facies in the middle of Yangzi area[J].Natural Gas Geoscience,2013,24(2):365-371.[张鹏飞,陈世悦,杨怀宇,等.中上扬子地区碎屑岩—碳酸盐岩混积相发育特征及组合模式研究[J].天然气地球科学,2013,24(2):365-371.]
[20]Wan Tianfeng,Zhu Hong.Tectonics and environment change of Meso-Cenozoic in China continent and its adjacent areas[J].Geoscience,2002,16(2):107-120.[万天丰,朱鸿.中国大陆及邻区中生代—新生代大地构造与环境变迁[J].现代地质,2002,16(2):107-120.]
[21]Wang Mingjian,Zhang Xunhua,He Dengfa,et al.Fault system and accumulation of Upper Palaeozoic coal-derived gas in eastern Linqing Depression[J].Journal of China University of Mining&Technology,2013,42(3):394-404.[王明健,张训华,何登发,等.临清坳陷东部断裂系统与上古生界煤成气成藏[J].中国矿业大学学报,2013,42(3):394-404.]
[22]Ye Zhou,Liang Xing,Ma Li,et al.An approach to exploration direction of oil-gas in the marine residual basins of independent Lower Yangtze Block[J].Chinese Journal of Geology,2006,41(3):523-548.[叶舟,梁兴,马力,等.下扬子独立地块海相残留盆地油气勘探方向探讨[J].地质科学,2006,41(3):523-548.]
[23]Engebretson D C,Cox A,Gordon R G.Relative Motions between Oceanic and Continental Plates in the Pacific Basin[R].The Geological Society of America.Special Paper,1985,206:1-59.
[24]Wei Xiangfeng,Zhang Tingshan,Wei Xianghua,et al.Paleogene sequence stratigraphy and source-reservoir-cap rock assemblage in Baiju Sag[J].Natural Gas Geoscience,2011,22(4):674-685.[魏祥峰,张廷山,魏祥华,等.苏北盆地白驹凹陷古近系层序地层及生储盖组合分析[J].天然气地球科学,2011,22(4):674-685.]
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