Fault system and its control over deep natural gas reservoirs: taking Xujiahe fault depression in Songliao Basin as an example

Based on the systematic division of fault system in Xujiaweizi area, Studied the relationship between faults and deep oil and gas reservoir formation. The research shows that there are two sets of vertical fault systems in Xujiaweizi area, namely the lower fault structure and the upper fault structure. The formation and distribution of Shahezi coal measure source rocks are controlled by the Xuxi fault, and the formation and distribution of Ying1 member and Ying3 member volcanic reservoirs are controlled by the Xudong and Xuzhong faults, respectively. During the formation of the upper fault system, Xuzhong fault is a direct gas source fault with strong charge, which is strongly connected with source rock and volcanic rock reservoir. Searching for volcanic reservoirs with good physical properties near the Xuzhong Fault is a favorable target area for further exploration of the Xujiaweizi deep gas reservoir.