Study On Reservoir Classification And Evaluation Method Of Shan1-he8 Member In East Jiangsu Infill Well Area Of Sulige Gas Field

With the continuous expansion of exploration and development scale of tight gas resources in China,its position in the field of natural gas industry is increasingly prominent,with broad prospects for development.Therefore,the fine evaluation of tight gas reservoir is particularly important.At present,scholars at home and abroad use a variety of technical means to carry out comprehensive evaluation of tight reservoirs,which has gradually developed from qualitative evaluation to quantitative evaluation,and the introduced evaluation parameters have gradually changed from simple macro and static parameters(porosity,permeability,etc.)to comprehensive evaluation parameters including micro and dynamic ones.The indexes of reservoir classification evaluation are also increasing,and the evaluation system is gradually completed Prepare.The upper paleo gas reservoir of Sulige gas field is a typical fluvial facies tight sandstone gas reservoir,which has been put into development on a large scale at present.For the evaluation research of this kind of tight reservoir,the selection of reasonable evaluation parameters is particularly important.Based on the data of geology,well logging,logging,analysis and test,and actual dynamic production,this paper studies the multi-scale,multi-dimensional and comprehensive classification evaluation of tight sandstone reservoir,and establishes a reasonable reservoir classification evaluation standard and method suitable for the study area.First of all,the strata in the East Jiangsu infill well area are subdivided,and the fine evaluation unit with single sand body as the level is divided;based on this,the study of sedimentary microfacies is carried out,and the distribution law of sand body and sedimentary microfacies in each subdivided layer is clarified.Then,from the macroscopic and microscopic point of view,the comprehensive evaluation parameters(i.e."five phases")which are suitable for the tight reservoir in the study area are determined,and the comprehensive utilization of lithology analysis experiment(casting slice observation,X-ray diffraction experiment,etc.),physical property analysis experiment(pore and permeability analysis experiment),pore structure characterization experiment(SEM,constant velocity mercury injection experiment)and fluid characterization experiment(NMR)are made Experiment)and other experimental data,analyzed the differences and advantages and disadvantages of tight reservoir under the constraints of sedimentary microfacies,diagenetic facies,petrophysical facies and seepage structure,and divided different classification units.Finally,according to the dynamic production data of gas reservoir development,the production facies control classification of the reservoir is carried out,and on this basis,the "five facies"parameter constraint classification method of the tight sandstone reservoir in shan1-he8 section of the eastern Jiangsu encryption area is established,and the reservoir of each subdivision is comprehensively classified and evaluated.