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Research On The Gas-bearing Property Logging Evaluation Method Of Deep Shale Gas Reservoirs In Southern Sichua

Posted on:2023-07-22Degree:MasterType:Thesis
Country:ChinaCandidate:H FuFull Text:PDF
GTID:2530307163490914Subject:Geophysics
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With the development of shale gas commercialization in the United States,more and more countries have recognized the potential and prospects of shale gas,and my country has also accelerated the development of shale gas.The Sichuan Basin is the main shale gas producing area in my country.The investigation by domestic and foreign experts and scholars found that the shale gas in the Sichuan Basin has great development value.However,my country started late,so it has learned from the experience of shale gas in North America in many aspects.In addition,due to the unique geological conditions of the Sichuan Basin,it has also encountered many difficulties in exploration and development.In this thesis,the Longmaxi Formation shale from many wells in Changning and Luzhou areas in the southern Sichuan Basin is studied,and a series of analyses of the gas-bearing properties of shale in southern Sichuan are carried out by collecting a large number of logging and core experimental data.The marine facies page is relatively complex,and the evaluation method of rock properties in conventional sandstone is not very practical.In this thesis,the Δlog R method,natural energy spectrum method and logging curve fitting method are mainly used to evaluate the total organic carbon content.In terms of porosity logging evaluation,since the composition of shale in southern Sichuan is diverse and complex and contains a large amount of organic matter,which adversely affects porosity prediction,this paper proposes a new method for predicting the porosity of shale reservoirs in southern Sichuan by using element logging information.Consistent with the core experimental results.In terms of saturation calculation,the modified Total-shale equation and Indonesian equation are used to make the prediction of water saturation more accurate in the study area.In the evaluation of adsorbed gas,the isotherm adsorption experiment and a series of corrections to the Langmuir isotherm adsorption model and the BET model are used to make the calculation results more accurate and the application effect is better.
Keywords/Search Tags:shale gas, adsorbed gas, porosity, saturation, free gas, logging evaluation method
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