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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2018-03
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Reservoir characteristics of the Wufeng-Longmaxi Formations shale in the Tianba profile of Wuxi,Daba Mountain,China

HE Jiawei;XIE Yuan;HOU Mingcai;YANG Ping;LIU Jiahong;XUE Shiyu;WU Bin;WANG Wenchuan;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology;Chengdu Center,China Geological Survey;  
The methods of organic geochemistry,mineral composition,scanning electron microscopy,specific surface area-aperture,and isothermal adsorption are used to study the parameters of the Wufeng-Longmaxi Formation shale reservoir in the Tianba section of Wuxi area so as to expand the shale gas exploration area of the Wufeng-Longmaxi Formation in the Sichuan Basin.The results show that siliceous shale from the Wufeng-Longmaxi Formation is rich in fossils and that the Longmaxi Formation possess a high-quality shale segment according to the standard for quality shale of TOC(mass fraction of the total organic carbon)2%.The thickness of high quality shale segment in Longmaxi Formation is 54.31 m with an average TOC of 3.80%,Rbof 2.90%,and Roof 2.28%.TOC is inversely proportional to siliceous and brittle mineral contents,is proportional to clay mineral,pyrite content,and total pore volume of BJH.Organic pores and interfacial linings are the most important reservoir space in the study area and the mesopores,open gaps at both ends,provide the reservoir space and seepage channel for the occurrence of shale gas.Both TOC and clay mineral content control the development of microscopic pore structures in shale reservoirs.Wufeng-Longmaxi Formation shale reservoir has stable reservoir porosity and permeability,large adsorption capacity,strong adsorption capacity.Compared Wuxi Tianba area with Well Jiaoye-1,it is found that the Longmaxi Formation shale in the Wuxi Tianba area has high TOC,Rb,siliceous,and dolomite content,low feldspar,carbonate,low porosity and permeability: "four highs and four lows"characteristics.Generally,the Wufeng-Longmaxi Formation has moderate thermal evolution extent,better microporosity and microfracture system,which are favorable for shale gas enrichment.
【Fund】: 中国地质调查局项目(12120114071401 121201010000150005)
【CateGory Index】: P618.13
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