Research On Influence Factors And Well Logging Evaluation Method Of Gas Content For Shale Gas Reservoir

Based on the collection of conventional logging data and core measurement data in the study area,the influence factors and well logging evaluation method of gas content for shale gas reservoirs were analyzed in the thesis.Based on the research status at domestic and broad,the methods of logging evaluation of shale reservoirs were summarized.At the same time,the influence factors and evaluation methods of gas content were studied.After understanding the geological characteristics of the study area,the reservoir characteristics of the target layer were studied and analyzed.In the evaluation process of shale reservoir parameters the content of TOC was obtained with Δlg R method and crossplot method respectively;the porosity of the target layer was calculated by multiple linear regression method;the evaluation of reservoir mineral composition was used ECS elemental logging and conventional logging analysis;calculation of clay mineral content in the target layer based on the constructed multiple linear regression model.After obtaining the parameters of the target layer,the factors affecting the adsorption gas and free gas content were discussed respectively.The calculation model of gas content of shale gas reservoir was constructed based on the influence factors of gas content,and the free gas was calculated by gas saturation conversion method.The content of the adsorbed gas was calculated by Langmuir isotherm adsorption method.Comparing the calculated gas content data with the core measurement data,it is found that the matching degree of the two is relatively high,indicating that the constructed gas content model has good applicability in the study area.