1 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China; 2 National Energy Shale Gas R & D(Experiment)Center,Hebei Langfang 065007,China; 3 Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 102206,China; 4 Geology Research Institute,CNPC Great Wall Drilling Co.,Ltd.,Liaoning Panjing 124010,China; 5 Shale Gas Research Institute, Southwest Oil and Gas Field Company, PetroChina, Chengdu 610051, China
Abstract：Sedimentary structures can not only provide insights into the formation environment and hydrodynamics of marine fine-grained terrigenous clastic rocks,but also significantly influence the permeability and fracturability of shale gas reservoirs. Based on comprehensive analysis of relevant materials at home and abroad,the types and origins of marine fine-grained terrigenous clastic rocks were systematically summarized. The rocks exhibit physical,chemical and biological structures. The physical structures mainly include flow structures and soft-sediment deformation structures. Flow structures include cross lamination,horizontal bedding or lamination,massive structure,graded lamination,and composite lamination. Soft-sediment deformation structures include slumps and slides,load structures,flame structures,ball-and-pillow structures,convolute lamination,contorted lamination,disrupted lamination,and dropstones. Chemical structures comprise carbonate concretes and pyrites,with biogenic structures primarily consisting of trace fossils and bioturbation. The three major types of sedimentary structures are mainly the result of fine-grained turbidites,contourites,and pelagites-hemipelagites,with a few arising from sediment deformation. Variations in sedimentary structures directly influence the permeability of shale gas reservoirs and affect the generation and propagation direction of hydraulic fractures.
SHI Zhensheng,ZHANG Yaxiong,ZENG Fanhui et al. Main sedimentary structure types of marine fine-grained terrigenous clastic rocks and their significance for shale gas[J]. JOPC, 2025, 27(1): 32-54.
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