Based on corestone data of JY11-4 Well in Jiaoshiba area and the analysis of its mineral component and or-ganic carbon content ,it is believed that quartz and clay mineral are major mineral components of the shale in Wufeng-Longmaxi Formation ,accompanied with feldspar ,calcite ,dolomite and iron pyrite ,and organic carbon content is 0 .55% ~5 .89% from top to bottom .By analyzing the shale phase of Wufeng-Longmaxi Formation combined with results of U and T H well logging interpretation ,five phases are determined:low -organic and low -silicon shale phase ,medium-organic and low -silicon shale phase ,low -organic and high-silicon shale phase ,medium-or-ganic and high-silicon shale phase ,and high-organic and high-silicon shale phase ,among w hich the last is the most suitable to exploration and development of shale gas .%针对目前焦石坝地区海相页岩气勘探开发需要,以 JY11-4井岩心资料为基础,通过电子显微镜观察、矿物组分及有机碳含量分析 ,研究区五峰组-龙马溪组页岩矿物组分以石英和粘土矿物成分为主 ,含有长石、方解石、白云石、黄铁矿等 ,有机碳含量0 .55% ~5 .89% ,具有自上而下逐渐增加趋势 ,结合 U、T H测井解释结果 ,剖析五峰组-龙马溪组页岩岩相特征,划分为低有机质贫硅页岩相、中等有机质贫硅页岩相、低有机质富硅页岩相、中等有机质富硅页岩相和富有机质富硅页岩相等5种岩相 ,其中富有机质富硅页岩相为页岩气勘探开发最有利页岩相 ,对南方海相页岩气的勘探开发具有重要指导作用.
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