Prediction Of Gas-bearing Properties Of Tight Sandstone Reservoirs In Formation He8 Of Block Su186,Sulige Gas Field

With the increasing demand for natural gas energy,tight sandstone gas,as an important part of unconventional natural gas,has attracted extensive attention in exploration and development.The Sulige Gas Field is the largest natural gas field discovered so far in China,which is a large-scale continental sandstone lithologic trap gas reservoir.The study area is located in the western part of Sulige Gas Field.The target member He8 is a typical tight sandstone reservoir,which has geological difficulties such as deep burial,thin sand body,low porosity and permeability,strong heterogeneity,complex gas-water relationship,etc.So,it is difficult to predict the effective reservoir.Therefore,the study of gas bearing prediction of tight sandstone reserviors can provide a favorable basis for the optimization of gas bearing areas and the efficient development of few wells.On the basis of full investigation of current research status at home and abroad,aiming at the geological characteristics of the upper paleozoic He8 member reservoir,which has some geological problems faced in the process of exploration and development and the difficulties of reservoir prediction in Su186 Block,this study has formulated a technical route of reservoir gas bearing prediction from the main channel to the reservoir,and then from the reservoir to the gas bearing gradually deepening.Make full use of geological,drilling,testing and three-dimensional seismic data for fine data interpretation,strengthen basic research such as model forward modeling,petrophysical and sensitive parameter analysis,carry out key technology research such as seismic facies analysis,AVO analysis,pre-stack elastic wave impedance inversion and oil-gas sensitive attribute analysis,carry out comprehensive prediction research on reservoir thickness and gas bearing property,accurately depict sand body and the spatial distribution of gas bearing sand bodies,the analysis of the main control factors of gas reservoirs,the comprehensive evaluation of the target interval,the final optimization of the first type of gas bearing favorable area in He8 member is 24.28km~2,accounting for 11.5%of the total area;the?+?type of gas bearing favorable area is113.42km~2,accounting for 52.7%of the total area,forming a set of technical methods for gas bearing prediction of dense sandstone gas reservoirs.The results show that AVO,pre-stack elastic wave impedance inversion and oil and gas detection can be used to predict the gas bearing property of"mudstone like"tight sandstone gas reservoir in Sulige Gas Field,which provides the basis for later exploration and development.