辽河盆地红星地区浅层气藏成因及其勘探意义

GENESIS AND EXPLORING SIGNIFICANCES OF SHALLOW GAS RESERVOIR IN HONGXING AREA,LIAOHE BASIN

通过分析辽河盆地红星地区浅层气的分布、控制因素与成藏特征,搞清了该区浅层气的成因,指出红星地区与驾掌寺生油洼陷紧邻,驾掌寺大断裂的晚期活动为深层油气在纵向上的调整提供了通道条件和圈闭条件,进而为浅层气藏的形成奠定了物质基础,同位素资料显示东营组浅层气为高成熟热解气,与深层油气藏具有亲缘关系,深部(沙一段)的原生油气藏被改造,导致部分油气沿断裂发生垂向运移至浅层,并沿断裂两侧聚集而形成浅层气藏。认为该区的浅层气已形成了一定规模的产能,在目前天然气勘探开发形势严峻的情况下,可为辽河油田天然气的勘探开发提供一个具体目标。

The genesis of shallow gas in Hongxing area has been studied through analysis of its contribution pattern, controlling factors and pool-forming characteristics. Hongxing area is closely adjacent to Jiazhangsi depression which is an important hydrocarbon source for both deep oil reservoirs and shallow gas reservoir. With a later activity history, Jiazhangsi fault supply the migration path and trap structure for the shallow gas. Data of carbon isotope and chromatogram demonstrate that the shallow gas is high mature pyrogenation gas which has original relationship with the oil reservoirs of Es1. Along the faults, the gas and oil from the deep oil reservoirs of Es1 moved to the shallow position and assembled in the favorable trap, forming the shallow gas reservoir. The production of shallow gas has reached to a high scale. The shallow gas is important in improving the condition of natural gas exploring and development in Liaohe oil field.