Well Logging Evaluation Of Shanxi Formation Shale Gas Reservoir In Block W,Central Henan

In order to serve the shale gas reservoir evaluation in Henan Province,this paper takes the Shanxi formation of block w as the research object,through the prediction and analysis of shale gas lithology,geochemical parameters,physical properties and gas bearing properties,and then divides the favorable area of Shanxi Formation shale gas reservoir of block W,through the establishment of favorable area evaluation standards in block W,and finally serves the subsequent exploration and development of shale gas in the research area Provide theoretical basis.Based on a large number of literature research,through the collection of geological data,core data and logging data in the study area,the first step is to preprocess the logging data,then carry out the stratigraphic division and correlation in the study area,the qualitative identification of lithology,establish the prediction model of shale gas reservoir mineral content,geochemical parameters,porosity and permeability in the study area,and then the shale gas reservoir in the study area The influencing factors of the total gas content of gas reservoir are analyzed,and the prediction model of the total gas content is established.Finally,the favorable area of the reservoir is divided by the optimization of parameters and the grey correlation method.The study shows that the strata in the study area are mainly mudstone,sandstone,sandy mudstone,coal and limestone.The formation thickness and shale thickness of Shanxi formation decreased gradually from south to north.As quartz is the main brittle mineral in the study area,the content of quartz brittle mineral and clay mineral in the study area are established based on core test data and logging curve data.Using ?lg R,natural gamma density model method and multiple regression method to calculate the total organic carbon content in the study area,and finally optimize the multiple regression method to predict the total organic carbon content model of the shale gas reservoir in the whole study area.Based on the relationship between the measured data of porosity and permeability and logging response in the study area,the porosity and permeability of shale reservoir in the study area are predicted and analyzed.Based on the optimization of the gas saturation model suitable for the study area,the total gas content obtained by the combination of the adsorbed gas and free gas in shale reservoir and the total gas content calculated mainly by regression analysis method are compared with the measured data.Finally,the total gas content of shale reservoir in the study area is calculated by regression analysis method.Through the optimization of shale reservoir evaluation parameters and the application of grey correlation method,the shale reservoirs of Shanxi Formation in the study area can be divided into class I,class II and class III from high to low.