Reservoir Comprehensive Evaluation And Productive Advantageous Regions Prediction On Shanxi Reservoir In Shenmu

The geological condition of Shenmu gas field is very complex,many negative factors,such as poor reservoir property,property plane changing quickly,intense diagenesis,pore throat types variable as well as strong heterogeneity affect its production.The development of construction in recent years indicated that the Shenmu gas field,which is in a large area,low permeability,low abundance background also remains relatively rich region.For purpose of solving above problems,this article regards the reservoir comprehensive evaluation as the research content.By virtue of multiple experimental testing method and various data analysis,we conduct a comprehensive analysis of reservoir lithology,pore throat structure,percolation characteristic and reservoir heterogeneity from small layers division,classification of microfacies and research of the sandbodies distribution.Next,select reasonable main parameters to conduct comprehensive reservoir evaluation,and then divide the favorable reservoir zones by comprehensive analysis of reservoir evaluation results and gas testing results.The results are as follows:1.This area is a large westward monoclinal structure,the study area is located in the high positions of structure and has a stable tectonic background.and the development of the distributary channel and Interdistributary lowland microfacies of river-dominated delta is control by the provenance from northeast.The scale and size of the sand body on the plane is expanding as ribbon or lens.2.The Shanxi reservoir in this area belongs to the typical low porosity and low permeability lithologic gas reservoir.The reservoir is mainly composed of lithic quartz sandston and the content of matrix in the sandstones is high,developing debris dissolution pore and intergranular pore.The pore was greatly destroied by strong diagenesis(compaction and cementation),but the dissolution can improve the reservoir property.Diagenetic facies of Shanxi formation are classified into 5 kinds by test date such as casting thin sections,X-ray diffraction,scanning electron microscopy,and the correspondence model is established between logging response and diagenetic facies combining with the logging data such as Natural gamma ray,acoustic time,neutron,density and resistivity logging.3.The Shanxi reservoir development degree is controlled by deposition and diagenesis,sedimentation determines the composition and structure of the reservoir rock(development status of primary porosity),the diagenesis reconstucted pore structure(development status of secondary porosity).According to gas testing results and the reservoir comprehensive evaluation results(lithology,physical property,pore structure),I kind favorable area were select about 176.54 square kilometers,II kind favorable area were sum to 192.10 square kilometers.