Study On Logging Interpretation Method Of Shale Gas Reservoir In AH Block At The Eastern Foot Of Taihang Mountain

In order to serve the comprehensive evaluation and research of shale gas reservoir logging in the AH block at the eastern foot of Taihang mountain,this paper studies shale gas logging interpretation methods based on the geological data,core test data and coal field logging data of the AH block.Firstly,regional geological characteristics analysis and logging data preprocessing are carried out.Secondly,stratigraphic division and correlation are completed according to the characteristics of marker beds,auxiliary marker beds and sedimentary cycles in this area,and the statistical characteristics of logging response are analyzed according to the logging response in this area.Then,the gas-bearing shale segment is effectively identified according to the conventional logging method combined with the uranium curve method.Then,based on the core test data and logging data,the log interpretation and prediction models of mineral composition,geochemical parameters and physical parameters are constructed.Finally,based on the characteristics of low-resistivity shale in this area,the free gas and adsorbed gas content in the study area were calculated respectively by using TOC method and improved volume model method,and the total gas content calculation model suitable for the shale in this area was established.Finally,the study on the gas content characteristics of shale gas reservoirs in this area was completed.The study shows that the geological characteristics of shanxi formation in AH area are mainly delta deposition with little variation in stratigraphic fluctuation,and the lithology is mainly fine sandstone,siltstone,sandy mudstone,mudstone and coal seam.The logging response characteristics in this area are generally "two high,one medium and two low".The middle and lower part of shanxi formation is mainly gas-bearing shale.In this area,the mineral components of shale are mainly divided into brittle minerals and clay minerals,among which the brittle minerals are mainly quartz.The organic matter of shale is in the maturation-high maturation stage,and the potential of hydrocarbon generation is relatively poor.The calculation models of porosity and permeability in common use were summarized.Statistical model method and empirical model were used to calculate the porosity and permeability in this area combined with the data in this area.On the electrical characteristics of the shale reservoir,based on the total air content of shale test data,research suggests that the TOC method to predict the purpose in the study area layer "free gas and adsorbed gas content" good effect of conventional archie formula method,based on the regional total air content test data and logging data statistical analysis prediction model of total air content to establish the best effect.Based on the prediction of gas content,the calculation and distribution characteristics of total gas content in this area were studied.At last,the commonly used calculation methods of rock mechanical parameters and brittleness index are summarized,and the optimal calculation method suitable for the study area is selected to carry out the calculation of relevant mechanical parameters and draw the relevant plan.