Dolomite development of lower Permian Maokou formation in middle and eastern Sichuan

Combined with the practical data of 3 000 km seismic profile and 1 200 wells drilling data in Sichuan basin, starting from the typical wells and well blocks, in combination with geological and seismic facies, the characteristics of dolomite logging, seismic response and the distribution regularities of the Maokou formation in the middle Permian were studied. The results show that when the dolomite was developed at MAO 2 a member, the dolomite bottom was of weak-strong reflection characteristics on the seismic section, the dolomite development zone was in the northwest-southeast distribution, and it is the most favorable dolomite reservoir development area near the shale development area on the left side of the border. The distribution of dolomite in Maokou formation of lower Permian in Sichuan basin is a strip of large area and the seismic exploration potential is huge, which is a replacement target for further exploration.