Abstract：The main Carboniferous reservoir rocks in Kaijiang area are granular and rubble dolomites. The reservoirs are characterized by low porosity and permeability, low water saturation, and the mesoporous and small throat system. Reservoir performance is mainly controlled by fissures, which were mainly formed in Himalayan period and have become the main channels for Carboniferous natural gas, with most of the structural fissures not filled or half-filled. The favorable reservoir diagenetic event was dolomitization. Karst slope and palaeostructure slope constituted the Indosinian paleouplift slope or the palaeostructure height in subsequent geological history, and the reservoir space was further dissolved by acidic water in the formation under the later burial action. This area has always been in the well-developed secondary dissolution pore zone and the favorable zone for oil and gas migration and aggregation. Therefore, the Kaijiang Carboniferous reservoir favorable area is mainly distributed in the paleokarst slope which is developed in the erosional Carboniferous remnants around the Kaijiang-Jiangping zone.