川西南井研地区筇竹寺组页岩气特征

CHARACTERISTICS OF SHALE GAS OF THE QIONGZHUSI FORMATION IN JINGYAN AREA OF SOUTHWEST SICHUAN

综合川西南井研地区JS1井钻井、测井等资料,对比邻区筇竹寺组、龙马溪组页岩储层岩性特征、厚度、有机质类型及含量、成熟度、裂缝、孔隙度、渗透率、矿物组成、压力、含气性等,分析认为JS1井地区筇竹寺组页岩有机碳大于2%、厚度大于100m、Ro在3%左右、石英含量大于40%、含气量平均1.8m3/t、裂缝发育,其余各项指标也较好,仅埋深较大。因此,川西南地区筇竹寺组及龙马溪组是下组合有利的页岩气勘探目标层系,与北美页岩气相比,也是适合开发的页岩层。

Based on the comprehensive analysis of drilling-logging data from the JS1 well in Jingyan area of Southwest Sichuan, and on the correlation of reservoir lithology, thickness, organic matter type and amount, organic maturity, fracture development, porosity, permeability, mineral composition,pressure and reservoir gas-bearing property from the JS1 well with the Qiongzhusi and Longmaxi Formation of the adjacent area,it is recognized that the organic carbon content of Qiongzhusi Formation shale is over 2% ,the shale thickness is over 100 m,Ro is about 3% ,quartz content was over 40%,the average gas content is 1.8 m3/t,with well developed and relatively deep burial. Therefore,the Qiongzhusi Formation and Longmaxi Formation in southwest Sichuan was the favorable exploration target for shale gas, suitable for development of shale gas in com- parison with the North American shale gas.