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文留地区气藏形成的基本条件是气源丰富、中低渗储集层发育、圈闭类型多样 ,且盖层条件优越。受地质结构特别是生储盖组合的控制 ,有煤成气藏和油型气藏两类天然气聚集型式。煤成气藏为石炭二叠系煤系二次生气 ,通过断层垂向运移而聚集成藏 ,主要分布于文 2 3盐下 Es4段圈闭中 ;油型气藏主要通过下第三系气源岩侧向运移聚集成藏 ,受构造、岩相变化影响 ,包括 3种类型 :Es33亚段文东滚动背斜带的大型岩性构造气藏、Es下2 Es1 3 亚段的小断块凝析气藏及局部的气顶气藏
The basic conditions for the formation of gas reservoirs in Wenliu area are rich gas source, development of low-permeability reservoirs, diversified traps and favorable caprock conditions. Controlled by the geological structure, especially the reservoir-cap combination, there are two types of natural gas accumulation types, namely coal gas reservoirs and oil gas reservoirs. Coal gas reservoirs are secondary gasses of the Carboniferous Permian coal series that accumulate through the vertical migration of faults and are mainly distributed in Es4 trap of Wen 2 3 salt. The oil gas reservoirs mainly pass through the Lower Tertiary The gas source rocks migrate laterally and accumulate in the reservoirs, and are affected by tectonic and lithofacies changes. They include three types: the large lithologic structural gas reservoirs of the Wendong rolling anticline in the Es33 sub-block, the small fault blocks in the Es2 Es1 3 subbasin in Es Condensate gas reservoirs and local gas capitals