涪陵海相页岩气储集层岩石地球物理化学特征实验分析

Experimental Analysis of Petrophysical and Chemical Characteristics in Fuling Marine Shale Gas Reservoirs

涪陵地区五峰-龙马溪组海相页岩地层矿物特征、页岩储集空间特征、页岩层有机质特征、物性及地球化学特征实验显示:镜质体反射率RO分别为2.4%和2.75%,孔隙度平均为4.5%,水平渗透率平均为23.9毫达西,基质渗透率平均0.27毫达西;无机孔隙主要包括粒间溶孔、粘土矿物晶间孔以及微裂隙;有机质表面的有机质孔面孔率平均为30%。页岩储集层以干气为主,实验结果对国内外同类页岩气储层评价及压裂过程作业具有重要指导价值。

Mineral characteristics of Marine shale formations,reservoir space characteristics of shale,organic matter characteristics,physical properties and geochemical characteristics of shale in the Wufeng-Longmaxi Formation in Fuling area indicate:the vitrinite reflectance Ro is 2.4%and 2.75%respectively,the average porosity is 4.5%,the average horizontal permeability is 23.9 mD,and the average matrix permeability is 0.27 mD;inorganic pores mainly include intergranular dissolved pores,clay mineral intercrystalline pores and microfractures;the average pore surface ratio of organic matter is 30%.Shale reservoirs are dominated by dry gas.The experimental results can provide important guideline for the evaluation and fracturing process of similar shale gas reservoirs at home and abroad.