蜀南地区天然气地质特征及勘探方向

为寻找四川盆地南部老探区（以下简称蜀南地区）下一步勘探有利区带，系统分析确认该区基本地质特征，具有：多期构造旋回发展演化，沉积层系相对完整，多源供烃、多储层层系及圈闭类型、多期成藏及多个含油气系统等特点。通过对老井重新认识，结合勘探成效及研究成果，认为近期蜀南地区研究和勘探的重点是：①深化二叠系、三叠系勘探是目前“增储、上产”的关键；②主攻上三叠统须家河组气藏是近期天然气储量大幅度增加的重点；③古隆起外围雷口坡组是近期找气的重点层系；④下古生界及震旦系是寻找天然气发现的新领域；⑤页岩气藏将是蜀南地区非常规油气勘探开发的新领域。

Geologic characteristics of gas reservoirs and exploration direction in southern Sichuan Basin

In order to identify favorable plays for future exploration in the southern Sichuan Basin, a systematic analysis of the basic geologic features in this area shows that it is characterized by multiphase cyclic structural evolution, relatively complete sedimentary sequences, multiple source rocks, multiple reservoirs and trap types, multiphase hydrocarbon pooling and multiple petroleum systems. A restudy of the old well data as well as the exploration and research results show that research and exploration should focus on the following in the near future. ①Strengthening the exploration of the Permian and Triassic is the key to reserves growth and production increase; ②The Xujiahe Formation gas reservoirs are the main targets of exploration to realize a large growth of gas reserves in the near term; ③The Leikoupo Formation on the periphery of the palaeohigh is the major horizon for gas exploration in near term; ④The Lower Paleozoic and Sinian are the frontiers for gas exploration; ⑤Shale gas reservoirs will be the frontier for unconventional gas exploration and development in southern Sichuan Basin.