四川盆地下古生界页岩气藏形成条件与勘探前景

下古生界筇竹寺组和龙马溪组黑色页岩已被证实为四川盆地石炭系、震旦系等大中型气田或气藏的重要烃源岩，同时有迹象表明自身也具有形成页岩气藏的潜力。初步研究结果表明，筇竹寺组和龙马溪组黑色页岩均具有厚度大、区域分布广、富砂质、硅质和有机质的特征，且已见到大量油气显示和小规模油气流，具备形成页岩气藏的有利地质条件。四川盆地南部地区下古生界页岩气资源丰富，其中威远和自贡-泸州-永川２个区块可作为近期开展页岩气勘探开发的有利目标区，通过老井复查和加砂压裂测试，有望取得勘探突破。

Accumulation conditions and exploitation prospect of shale gas in the Lower Paleozoic Sichuan basin

The black shale in the Lower Paleozoic Qiongzusi and Longmaxi formations has been proved to be the important source rocks of large and medium gas fields in Carboniferous and Sinian in the Sichuan basin, meanwhile there is signs indicating that it has its own potential to form shale gas reservoirs. The preliminary study shows that the black shale in the above mentioned areas is characterized by large thickness, wide distribution and enrichment of sand, siliceous and organic and that a large amount of oil and gas shows and small scale oil and gas flow have been encountered in these areas, so they possess the beneficial geological conditions to form shale gas reservoirs.The Lower Paleozoic in southern Sichuan basin is abundant in shale gas, especially such two blocks as Weiyuan and Zigong Luzhou Yongchuan can be taken as the favorable target areas in recent exploitation of shale gas and they are hoped to have a breakthrough by old wells re examination and sand fracturing.