Based on drilling, seismic, and logging data, this paper studies the reservoir characteristics of the Lower Cambrian Longwangmiao Formation in central Sichuan Basin, analyzes the main controlling factors for the development of high-quality reservoirs, and establishes the development model of high-quality reservoirs. The results show as follows. (1)The high-quality reservoirs of Longwangmiao Formation in central Sichuan Basin are mainly developed in the intraplatform grain beaches of limited platform facies, dominated by thick-layered massive grain dolostones. (2)The main reservoir spaces are dissolution pores, karst caves and fractures. According to the types of reservoir spaces, the reservoirs can be divided into fracture-dissolution cave type, fracture-dissolution pore type and fracture-intergranular pore type, of which the fracture-dissolution cave type is of good and high quality reservoir. (3)The Gaoshiti-Moxi paleohigh controls the deposition of grain beaches. Interlayer karstification and penecontemporaneous dolomitization provide a basis for the development of high-quality reservoirs. The effective allocation of paleohigh, grain beach, multi-period dissolution and fractures form high-quality reservoirs. (4)The grain beach reservoirs are well developed in the core of paleohigh. The grain beach reservoirs are better at the higher paleogeomorphologic position of paleohigh and the core of single grain beach.
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