Research On Logging Evaluation Of Effectiveness Of Sandstone Conglomerate Reservoir

Tight glutenite reservoirs have the characteristics of poor physical properties,complex pore structure,and strong heterogeneity.Generally,they do not have natural production capacity.It is often necessary to fracturing the formation to obtain industrial production capacity and meet mining standards.As a result,conventional well logging evaluation methods lose their effect in tight glutenite reservoirs.In order to improve the exploration efficiency of tight glutenite reservoirs,it is necessary to carry out evaluation studies on the physical properties,pore structure and fracturability of the reservoir,and build sand and gravel on this basis.Rock reservoir effectiveness evaluation standards and productivity prediction models,and identification of fluid properties for low-contrast oil(gas)layers.This thesis takes the Permian Jiamuhe Formation in the northwestern margin of the Junggar Basin as the research object.Using the core calibration logging method,the calculation models of shale content and porosity and the water saturation evaluation model based on Archie's formula are established respectively.Aiming at the extremely high heterogeneity of the target formation,based on the quantitative characterization of the pore structure of the reservoir,a permeability evaluation model based on Swanson and R10 parameters was established.Through comparison with the core results,the reliability of the model is verified.Based on the X-ray full-rock mineral analysis and rock mechanics parameters,the calculation model of the brittleness index of the glutenite reservoir was established.Based on the empirical formula,the fracture toughness of the reservoir was predicted using conventional logging data,and the glutenite reservoir was established in combination with the above parameters.Logging evaluation method for fracturing of formations.Combining permeability,pore structure,fracturability and oil test data,a well logging identification standard for the effectiveness of tight glutenite reservoirs in the Jiamuhe Formation has been established.On this basis,the relationship between reservoir physical properties,pore structure,fracturability and productivity are analyzed,and the parameters that are more sensitive to productivity:permeability and fracturability are extracted.Finally,a capacity prediction model based on two-parameter fitting was established.Using the apparent formation water resistivity spectrum obtained by micro-resistivity scanning imaging logging,the formation water resistivity change trend characterization method(P^1/2 method)was used to establish the identification standards for oil and gas and water layers.Compared with the existing methods,the method proposed in this study can continuously obtain the P^1/2 cumulative probability curve of the formation,which greatly improves the fluid identification accuracy of the heterogeneous formation.Based on the methods and techniques proposed in this paper,it is possible to accurately identify effective glutenite reservoir types,determine reservoir fluid properties,and predict productivity,which is of great significance for improving the exploration efficiency of tight glutenite reservoirs and reducing development risks.