关键词: 松辽盆地, 断裂, 天然气藏, 储层特征, 烃源岩

Abstract: Qingshen Gas Field, the largest gas field discovered in East China by now, lies in the Early Cretaceous rifted basin of Songliao Basin. In the gas reservoir forming period, fault has played a very important role. To make clear the relationship between faults and gas pool, it is significant to open up a new field for natural gas exploration in the deep layers under eastern mature oilfield. Through the analysis on relationships of the faults with Xujiaweizi fault-depression, hydrocarbon source rocks, volcanic reservoirs, trap and gas accumulation, it is primarily concluded that the formation and distribution of Qingshen Gas Field are both controlled by faults: a. Discordogenic faults, control basin boundary and deep structural framework,namely the basin is divided into the "blocks" in NS trending and "zone" in EW trending by a series of discordogenic faults which developed inside the basin; b. Rift-controlling faults govern the sedimentation of hydrocarbon source rocks and its planar distribution; c. Faults control the distribution of volcanic reservoirs and improve their physical properties of reservoir; d. Faults dominate the type and distribution orientation of traps, most deep tectonic traps distributing like a string of beads along the fault belts; e. Faults dominate the accumulation of natural gas.

Key words: Songliao Basin, fault, natural gas reservoir, reservoir characteristic, source rock