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安 6井和吐谷 1井是四川石油管理局在准南西部新近完钻的井。通过对这两口井的钻探已经意识到 ,准南的勘探不仅有工程技术上的风险 ,更面临着严峻的地质认识问题。通过对安 6井和吐谷 1井的生烃条件、油气源对比、储层分布、盖层有效性、构造圈闭条件以及异常高压对成藏的影响等诸方面的分析讨论 ,得出以下结论 :准南西部地区油气来源复杂 ,既有上部下第三系安集海河组及下白垩统吐谷鲁群湖相烃源岩生成的油 ,也有下部J1 +2 湖沼相煤系烃源岩所生成的油气混合 ;但以下部J1 +2 湖沼相煤系烃源岩所生成的油气为主 ;储层为近缘泛滥平原—滨浅湖陆源碎屑砂体 ;而油源断裂的发育则是成藏的关键因素 ;属异常高压次生油气藏。
Well An 6 and Well Tuotu 1 are newly completed wells drilled by Sichuan Petroleum Administration Bureau in the south west of China. Through the drilling of these two wells, it has been realized that the quasi-south exploration not only has engineering and technical risks, but also faces severe geological problems. By analyzing and discussing hydrocarbon generating conditions, hydrocarbon source contrast, reservoir distribution, caprock effectiveness, structural trap conditions and the effect of abnormal high pressure on hydrocarbon accumulation in well An 6 and Tugu 1, the following conclusions are drawn: CONCLUSIONS: The oil and gas sources in the quasi-southern and western regions are complex, including the oil from the Lower Upper Triassic Anjihaihe Formation and Lower Cretaceous Tuguluqun source rocks, and the lower J1 +2 lacustrine coal-derived source rocks However, the oil and gas generated from coal-based hydrocarbon source rocks in J1 +2 lacustrine-dominated reservoir in the lower part are the main reservoirs; the reservoir is marginal floodplain-terrestrial and shallow lake terrigenous clastic sand bodies; The key factor of reservoir is an abnormally high pressure secondary oil and gas reservoir.