Study On Reservoir Characteristics Of Carboniferous Igneous Rock Of Che471 Wellblock Of Chepaizi Oilfield

After the shallow exploration,the Che 471 well area has been further explored and developed to the deep layer,making the Carboniferous volcanic rock reservoir become the key target area again.With the continuous deepening of research,diverse volcanic lithology,unclear lithofacies distribution range,and complex reservoir space development have become the main problems restricting exploration and development.This article first uses core,thin section,physical and chemical data to distinguish lithology.The lithology is divided into two types: lava rocks and pyroclastic rocks,and then further divided into five types: basalt,andesite,volcanic breccias,tuff,and tuff volcanic breccias.In order to accurately analyze the lithofacies based on the logging data,the lithology is compared with the logging data to produce an identification map.According to the lithology and logging seismic data corresponding to various lithofacies,the distribution range of different lithofacies is divided.The distribution of eruption facies is mainly distributed in the southeast and north of the study area.The eruption facies are mainly distributed in the southeast and north of the study area.The overflow facies and volcanic sedimentary facies develop in a ring shape around the eruption facies.Among them,the overflow facies are mostly developed in the west of the study area,while the volcanic sedimentary facies are mostly developed in the northeast.Combining cores,thin section,physical and chemical data,logging data,it is clear that volcanic reservoir space types mainly have fractures and pores,and the impact of fractures on the reservoir has a positive significance.The pore-fracture type reservoir space is a favorable reservoir space.And it can be used as a target for finding high-quality reservoirs.Based on the data of superimposed lithologic lithofacies,reservoir space types,and oil test conditions,it can be determined that the dominant reservoir types are divided into three categories.Among them,type ? reservoirs are mainly distributed in the east,south and northwest of the study area,and type ? reservoirs are mainly distributed in the middle.