四川盆地震旦系—寒武系大气田形成条件、成藏模式与勘探方向
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摘要
通过对四川盆地震旦系—寒武系沉积相、储集体和储层、烃源岩、古隆起演化等成藏条件的综合研究,认为:1长期继承性发育的大型古隆起、大型克拉通内裂陷、4套大面积分布的优质烃源岩、3套大面积分布的岩溶储层、原油裂解气是形成大面积高丰度油气聚集的有利条件;2古隆起不同部位发育不同的气藏成藏模式,继承性古隆起核部以古油藏"原位"裂解聚集成藏为主,继承性古隆起斜坡以晚期构造圈闭分散液态烃裂解成藏为主;3古隆起不同部位有不同的勘探方向,古隆起核部以寻找继承性古构造圈闭为主,也具备岩性地层气藏勘探的基础,古隆起斜坡以寻找大型高幅度喜马拉雅期构造圈闭为主。
According to comprehensive research on forming conditions including sedimentary facies,reservoirs,source rocks and palaeo-uplift evolution of Sinian-Cambrian in the Sichuan Basin,it is concluded that:(1)large-scale inherited palaeo-uplifts,large-scale intracratonic rifts,three widely-distributed high-quality source rocks,four widely-distributed karst reservoirs and oil pyrolysis gas were favorable conditions for large-scale and high-abundance accumulation;(2)diverse accumulation models were developed in different areas of the palaeo-uplift.In the core area of the inherited palaeo-uplift,"in situ"pyrolysis accumulation model of paleo-reservoir was developed,while in the slope area,pyrolysis accumulation model of dispersed liquid hydrocarbon was developed in the late-stage structural trap;(3)there were different exploration directions in different areas of palaeo-uplift.Within the core area of palaeo-uplift,we should mainly search for the inherited paleo-structural trap,which was also the foundation of lithologicalstratigraphic gas reservoirs,while in the slope areas,we should mainly search for the giant structural trap in the Himalayan Period.
引文
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