川南地区下古生界页岩气成藏条件研究

从钻井、岩芯样品等分析资料出发，以下寒武统筇竹寺组、下志留统龙马溪组页岩为研究对象，对川南地区下古生界海相页岩气成藏条件进行了研究，指出该区筇竹寺组和龙马溪组页岩主要形成于陆棚沉积相，富有机质页岩厚度大，有机质丰度高（平均TOC>2%），有机质类型为Ⅰ，Ⅱ1型，热演化程度处于高-过成熟阶段，页岩中脆性矿物丰富，微米-纳米级孔隙发育，含气量高，有利于页岩气的形成与富集。与成功勘探开发页岩气的北美页岩相比，川南地区下古生界海相页岩具有良好的页岩气成藏条件，认为筇竹寺组、龙马溪组均是该区现实的页岩气勘探目标层，并提出了其页岩气富集有利区。

Study on the accumulation conditions of shale gas from the Lower Paleozoic in the south region of Sichuan Basin

Based on the data from drilling，core samples，etc.，taking the Lower Cambrian Qiongzhusi Formation and the Lower Silurian Longmaxi Formation shales as study target area，authors investigated the accumulation conditions of marine shale gas from the Lower Paleozoic in the south region of Sichuan Basin.The results indicate that the Qiongzhusi Formation and the Longmaxi Formation black shales in this region are mainly formed in shelf sedimentary facies.The study region features great organic-rich shale thickness，high organic abundance(average TOC>2%)，Type I〖BP(〗=1\*ROMAN〖BP)〗 and II〖BP(〗=2\*ROMAN〖BP)〗1 organic matter，high-over thermal evolution level，rich in brittle mineral，abundant in micro- and nanometer pores，and high gas content，which are in favor of the generation and enrichment of shale gas.Compared with the shales in North America，in which the shale gas has been explored and developed successfully，it is suggested that the Lower Paleozoic in the south region of Sichuan Basin has good accumulation conditions for shale gas.Therefore，the Qiongzhusi and Longmaxi Formations are considered as the practical targets for shale gas exploration，and their favourable areas of shale gas enrichment are also purposed.