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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。

MECHANISM OF FORMING RESERVOIRS IN ANJIHAI AND TUGULU ANTICLINES

Well An-6 and well Tugu-1 are the wells recently drilled by SPA in the west part of South Zhunge′er Basin.Through drilling the two wells,it is conscious of that the oil and gas exploration in South Zhunge′er Basin not only has the risk of engineering but also faces a serious problem with geological knowledge. Based on the data achieved from the two wells, through analyzing the influence of these factors,as hydrocarbon generating condition, hydrocarbon-to-source correlation, reservoir distribution, caprock effectiveness, trap efficiency and abnormal high pressure, etc., on reservoir formation it is concluded that the oil and gas sources in the west part of South Zhunge′er Basin are various, including the oil generated from the upper lacustrine facies hydrocarbon source rocks of Anjihaihe Formation, Palcogene, and Tugulu Group, Lower Cretaceous and the oil-gas mixture generated from lower limnetic facies coal-measure hydrocarbon source rocks of Middle-Lower Jurassic, however the latter occupies the major position; the reservoirs are composed of terrigenous clastic sandbodies of proximal flood plain-littoral shallow lake facies; the growing of oil-source faults is the key factor of forming reservoirs;and the oil and gas reservoirs in the two anticlines belong in the secondary reservoirs with abnormal high pressures.