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为研究松辽盆地北部大庆长垣以西地区中浅层天然气成藏与分布的控制因素和成藏模式,通过分析其天然气慝物分布规律及成藏条件,得到该区中浅层天然气的成藏及分布除了受源岩和盖层分布及质量的制约外,还要受圈闭发育和断裂分布的控制,该区中浅层具有三种天然气成藏模式,即侧向运移构造圈闭油溶释放成藏模式,侧向运移断层遮挡油溶释放成藏模式和沿断裂垂向运移浅层断层遮挡油溶释放成藏模式。

Natural Gas Formation and Distribution in the Western Area of Daqing Placanticline

This paper studies for the factors controlling th,e gas distribution characteristics and the gas accumulation models of middle and shallow strata in the west of Daqing pla-canticline. Through analyzing the distribution laws of gas reservoirs and the formation conditions of gas reservoirs, it is considered that the formation and distribution of the shallow gas pools in this area are controlled not only by the distribution of quality of gas source and caprock, but also by the development of trap and distribution of fault. Three formation models of gas pools are put forward in this paper as follows; the formation model of gas released from oil migrating laterally between two regional caprocks into structure trap; the formation model of gas released from oil migrating laterally between two regional caprocks strapped migrating vertically through fault into fault screen trap in shallow strata.