Reservoir characteristics and reservoir evaluation of Lei-1 segment of Huangjiachang-Longchang structure in southern Sichuan province

Based on core observation,analytical data from coring interval and log data,the comprehensive studies covering reservoir rock types,reservoir space types and reservoir properties of Lei-1 segment of Huangjiachang-Longchang structure in southern Sichuan province and the main controlling factors of reservoir development have been carried out and discussed.The reservoir classification and evaluation have been made.The results show reservoir of Lei-1 segment is mainly developed with dissolution holes,intergranular pore and micro-cracks.Affected by dissolution and dolomitization in the diagenesis,the reservoir properties were greatly improved.Reservoir of Lei-1 segment is of bigmiddle porosity and middle-low permeability.According to reservoir classification evaluation criteria in the area,Lei-1segment is mainly developed withⅡandⅢtypes reservoirs,and mainly distributed in the gentle slope zone,with structural high position of 900~1300m altitude and close to the ancient high uplift.