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沾化凹陷罗家地区沙三段下亚段页岩油气资源丰富,针对这类结构细、孔隙小的页岩类非常规储层,首次采用岩心观察—薄片鉴定—电镜分析—荧光观察综合分析方法,对该区沙三段下亚段页岩岩石学特征进行了系统研究,进而划分岩相类型、明确储集空间并结合物性测试资料落实储集性能。结果表明:罗家地区沙三段下亚段富含方解石,随着层位变老,方解石含量呈增加趋势,粘土矿物和陆源碎屑含量呈降低趋势;岩石类型以泥质灰岩为主,其次为灰质泥岩、含泥质灰岩;岩相类型以层状泥质灰岩相、纹层状泥质灰岩相为主,其次为层状灰质泥岩相、层状含泥质灰岩相,其中纹层状泥质灰岩为有利岩相;储集空间主要为各类微裂缝及方解石、粘土矿物晶间微孔;孔隙度主要为2%～8%,渗透率变化很大,主要为1×10-3～10×10-3μm2,其次为0.1×10-3～1×10-3μm2。
Shale oil and gas resources are abundant in the lower third member of Shahejie Formation in Luojia area of Zhanhua sag. According to the shale unconformity reservoirs with fine structure and small porosity, the shale oil and gas resources are abundant for the first time. Core observation, thin slice identification, electron microscope analysis and fluorescence observation comprehensive analysis Method, the shale petrological characteristics of the lower sub-section of the third member of the Shahejie Formation are studied systematically, and then the lithofacies types are divided. The reservoir space is defined and the reservoir performance is combined with the physical property test data. The results show that the lower third member of Shahejie Formation is rich in calcite in Luojia area, and the content of calcite increases with the increase of horizon, and the content of clay minerals and terrigenous debris decreases. The type of rock is dominated by argillaceous limestone, Followed by gray mudstone and mudstone limestone. The lithofacies are dominated by layered argillaceous limestone facies and laminar argillaceous limestone facies, followed by layered gray mudstone facies, layered mudstone limestone facies , In which the laminar shale limestone is favorable lithofacies; the main reservoir space for all kinds of micro-cracks and calcite, clay minerals micropores; porosity of mainly 2% to 8%, the permeability varies greatly, mainly 1 × 10 -3 to 10 × 10 -3 μm 2, followed by 0.1 × 10 -3 to 1 × 10 -3 μm 2.