Abstract
The formation mechanism and distribution law of natural gas reservoirs in the Xujiaweizi fault depression in the northern Songliao basin are complex, which restricts the progress of natural gas exploration and development. Therefore, based on the analysis of reservoir forming characteristics of Yingcheng Formation gas reservoir in Xingcheng area, the deep gas reservoir types and reservoir forming patterns in this area are studied. Yingcheng formation is mainly divided into upper conglomerate gas reservoirs and lower volcanic gas reservoirs. The analysis shows that the conglomerate gas reservoirs in the 4th member of Yingcheng Formation in Xudong fault depression are lithologic gas reservoir, and the volcanic gas reservoirs are lithologic structural gas reservoir. The fluid distribution of volcanic gas reservoirs in Yingcheng formation has obvious characteristics of upward oil and downward flow. And there is no uniform gas water interface. The conglomerate and volcanic rocks are vertically superimposed. The accumulation mode is lower generation and upper storage type.
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