Abstract：The Maokou Formation in syncline and slope areas in the southern Sichuan Basin are important fields for exploration and development. The high-quality reservoirs can control the enrichment of natural gas, and their distributions are mainly affected by the late karst transformation degree of grainstones deposited in intra-platform shoal subfacies. In addition, karstification that occurs along faults plays an important controlling role. In order to clarify the development model and seismic reflection characteristics of fault-controlled karst reservoirs, a fault-karst system of the Maokou Formation composed of two different karst zones is established based on the comprehensive analysis of the well logging, mud logging, and seismic data. Specifically, the system is reflected by ① The karst zone along faults, which is controlled by the development degree of the fault-associated fractures, and the zone is blocky and mainly developed near the faults, with a large thickness. The seismic facies are represented by reflection characteristics including weak peaks on top, strong peaks at the bottom, and clutter or blank inside. ② The karst zone along formations, which is controlled by the distribution range of grain shoals near the faults, and the zone is layered and far from the faults, with its single layer having a small thickness. The seismic facies are represented by bright spot reflection characteristics including a strong wave trough on top and a strong wave peak at the bottom.
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