焦石坝-武隆构造带古流体活动差异及对页岩气保存条件的影响
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摘要
焦石坝-武隆地区差异构造带发育,古流体活动复杂,对页岩气保存条件影响较为关键.以两类典型背斜(高陡背斜和箱状背斜)的裂缝脉为研究对象,基于裂缝分形理论和碳、氧、锶同位素地球化学理论,揭示出不同构造的古流体活动差异与页岩气保存条件优劣的耦合性.研究认为:(1)构造变形与古流体活动性存在耦合性.构造应力集中部位(如箱状背斜枢纽、隐伏断层)较构造其他部位具更强的流体活动性.(2)古流体示踪差异与页岩气保存条件存在耦合性.同位素地球化学揭示出二叠系-下三叠统以内源流体活动为主,封闭能力较好,盆内高陡背斜带和盆外残余向斜五峰-龙马溪组页岩气具备一定勘探前景;中寒武统-下奥陶统存在跨层流体活动的痕迹,封闭能力变差,盆外箱状背斜下寒武统筇竹寺组页岩气勘探风险加大.
The development of the differential tectonic zones in the Jiaoshiba-Wulong area with complex paleo-fluid activities is crucial to the preservation of shale gas.The fracture veins of two typical anticlines(steep anticlines and box anticlines)are studied.Based on the theory of fractal fracture and carbon,oxygen and strontium isotope geochemistry,it reveals the differences of paleo-fluid activities in different structure and coupling of shale gas preservation conditions.The study suggests fellows:(1)There is coupling between tectonic deformation and paleo-fluid activity.The fluid is more active in the tectonic stress concentration areas(such as box anticlinal hinge,hidden faults)than other parts of the structure.(2)There is coupling between paleo-fluid tracer differences and shale gas preservation conditions.Isotope geochemistry reveals that the internal fluid flow dominates in the Permian-Lower Triassic formation,and the sealing ability is good.The Wufeng-Longmaxi shale gas of the high-steep anticline in the basin and the residual syncline outside the basin has certain exploration prospects.There exists the trace of cross-layer fluid activities in the Middle Cambrian-Lower Ordovician formation,and the sealing ability deteriorates.The risks of shale gas exploration in the Lower Cambrian Qiongzhusi Formation of the box anticline outside the basin increased.
The development of the differential tectonic zones in the Jiaoshiba-Wulong area with complex paleo-fluid activities is crucial to the preservation of shale gas.The fracture veins of two typical anticlines(steep anticlines and box anticlines)are studied.Based on the theory of fractal fracture and carbon,oxygen and strontium isotope geochemistry,it reveals the differences of paleo-fluid activities in different structure and coupling of shale gas preservation conditions.The study suggests fellows:(1)There is coupling between tectonic deformation and paleo-fluid activity.The fluid is more active in the tectonic stress concentration areas(such as box anticlinal hinge,hidden faults)than other parts of the structure.(2)There is coupling between paleo-fluid tracer differences and shale gas preservation conditions.Isotope geochemistry reveals that the internal fluid flow dominates in the Permian-Lower Triassic formation,and the sealing ability is good.The Wufeng-Longmaxi shale gas of the high-steep anticline in the basin and the residual syncline outside the basin has certain exploration prospects.There exists the trace of cross-layer fluid activities in the Middle Cambrian-Lower Ordovician formation,and the sealing ability deteriorates.The risks of shale gas exploration in the Lower Cambrian Qiongzhusi Formation of the box anticline outside the basin increased.
引文
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