Fractures And Pores Coupling Of Shale Oil Reservoir And Shale Oil Accumulation Patterns In Jimusar Sag

The shale oil reservoirs of Lucaogou Formation in Jimusar Sag are complex in lithology,the development characteristics of fractures and pores in shale oil reservoirs with different lithologies are unclear,and the relationship between the coupling type of fractures and pores and shale oil accumulation is unclear.Under the guidance of multidisciplinary theories such as geology and unconventional oil and gas accumulation theory,on the basis of identifying six lithologic reservoirs,a variety of technical means such as core observation,imaging logging,casting thin sections and scanning electron microscopy are integrated,combined with classification According to the actual geological conditions and the comprehensive development characteristics of fractures and pores,the fracture-pore coupling types of shale oil reservoirs of six lithologies are defined:the fracture-pore coupling type of cuttings feldspar and fine sandstone is medium and large pores-seamless,cloud debris The fracture-pore coupling type of sandstone is medium-large pore-small structural fracture type,the dolomitic siltstone fracture-pore coupling type is medium-porous-small bedding structural fracture type,and the sand-cut dolomite fracture-pore coupling type is medium-porous-small structural multi-level.The bedding fracture type,the micrite dolomite fracture-pore coupling type is micro-pore-multi-level bedding-fracture type,and the dolomitic mudstone fracture-pore coupling type is micro-pore-small bedding fracture type.Through six sets of fracture-pore coupled physical simulation experiments with different lithologies,the accumulation mechanism of fracture-pore coupled shale oil in the reservoir is clarified,and the shale oil accumulation modes of four types of fracture-pore coupling are summarized from a spatial perspective:seamless-porous type coupling oil-rich model,bedding fracture-pore type coupling oil-rich model,structural bedding fracture-pore type coupling oil-rich model,structural fracture-pore type coupling oil-rich model,combined with shale oil accumulation model in shale oil According to the favorable accumulation area of shale oil,it is concluded that the dominant fracture-pore coupling can significantly improve the physical properties of the reservoir and control the accumulation of shale oil.The dominant fracture-pore coupling hydrocarbon-rich model of the rock-oil system.Accurately identifying the fracture-pore coupling type corresponding to shale oil reservoirs and summarizing the establishment of shale oil accumulation models not only provide theoretical guidance for the prediction of Jimusar shale oil sweet spots,but also provide theoretical guidance for shale oil exploration in areas with similar geological conditions It provides important theoretical basis for exploration and has important theoretical guidance and practical significance for exploration and development.