Abstract: Tight sandstone gas reservoirs are developed in the Xujiahe Formation in the northeastern Sichuan Basin.The presence of "fault-fracture reservoirs" contributes to the effective exploration of these types of gas reservoirs.However, the main factors regulating the formation of the fault-fracture reservoirs, as well as the three-dimensional spatial configuration, remain poorly understood, limiting further promotion and application.On the basis of the high-resolution OVT seismic data of the Malubei-Tongjiang area and geological characteristics of the fault-fracture reservoirs, which were combined with the geologically- or geophysically-based prediction technologies, a series of studies were conducted to quantitatively evaluate the fault-fold belt strength, fracture-pore reservoir prediction, and through source fault system.The fault-fold belt strength is controlled by fault strength, fault density, and fold strength.Micro fractures and sedimentary facies regulate the formation of the fracture-pore reservoir.The through source fault system is dominated by the thickness of gypsum salt rock and the configuration relationship between faults above and below the salt.Based on the three factors listed above, a three-element-integrated "fault-fracture reservoir" model with a fracture structure, fracture-pore reservoir, and through source fault was developed.Thus, a three-dimensional carving technology for "fault-fracture reservoirs" was created.This technology clearly illustrates the spatial morphology and internal structure of each unit of the "fault-fracture reservoirs", as well as the multi-dimensional configuration relationship of the gas accumulation elements, providing technical support for further fine exploration and development of fault-fracture gas reservoirs of Xujiahe formation.This research will also aid in the characterization and identification of "fault-fracture reservoirs" in other similar areas.