Reservoir Characteristics And Favorable Area Prediction Of The Cambrian Xuchi Formation In Guangnv Temple And Guang'an Area

Xixiangchi group is one of the important Paleozoic strata-Aurora exploration of oil and gas fields under the Sichuan Basin. From the point of view of drilling results:Xixiangchi Group carbonate rocks and the Longwangmiao has a group of similar lithology and oil and gas show good in the Longnvsi-Guang’an area.With considerable exploration prospects, so it is a great significance of in-depth study of its reservoir characteristics.This study aims at combining previous research results, using mineral petrology, sedimentology, petroleum geology, geochemistry, reservoir evaluation related theory and method.Xixiangchi Formation of division, stratigraphic distribution of the basic characteristics of sedimentary facies, particle distribution characteristics beach, reservoir rocks, and physical properties such as porosity and reservoir development main factors were studied.Through a comprehensive analysis of drilling, logging and core, earthquakes and other large amounts of data that can be divided into three Xixiangchi group bottom-up segments, and in the formation of the northwest Xixiangchi group study area has been erosion; Xixiangchi restricted platform group phase, mainly developed particle Beach, Tai Ping, lagoon Asia phase. Dolomite and sand debris identify dolomite grains are the main groups in the study area Xixiangchi reservoir rocks, mainly intergranular porosity type of solution pores, intergranular solution pores and intergranular pore, and "pinhole layer" major development dolomite crumbs in the sand. Physical characteristics of reservoir performance for low porosity and permeability, the local presence of high porosity and permeability characteristics. The combined effect of reservoir sedimentary facies and diagenesis by cracks also effectively improve the reservoir flow-capacity. The reservoir is mainly distributed in the wash Sec vertical, wash three sections, the plane is mainly distributed in the southeast Longnvsi-Guang’an.Integrated sedimentary facies, reservoir distribution, and other factors to establish reservoir evaluation criteria, divided into Ⅰ, Ⅱ two favorable exploration area, favorable exploration area to predict the southeast area of the Longnvsi construction grade I favorable exploration area, Guang’an-Hechuan ii grade line for favorable exploration areas.