【摘要】 运用油气二次运移差异聚集理论,对川南大塔场地区沙溪庙组一段气藏进行研究认为该层段油气差异聚集具有3个主要特征:①构造高部位的主河道砂体,且该砂体与边界深部断层相接;②主河道沉积,河道砂体上倾尖灭,砂体下覆地层小断层或裂缝系统发育;③叠置河道砂体,且砂体在油气运移通道上。综合研究认为该地区沙溪庙组一段气藏成藏,受控于构造、储层物性、运移通道、遮挡条件等成藏因素的组合及匹配状况。后期配合这3个主要差异聚集特征,部署钻井3口,均获得工业产能,证实这几种差异聚集特征是存在的。同时还认为这样的差异聚集特征,在整个川南地区浅层次生气藏中应该具有共性,此观点在该类气藏的勘探中具有指导意义。更多还原

【Abstract】 For the obvious selective accumulation characteristics of shallow low-pressure gas reservoir of Datachang in the south of Sichuan,the use of oil and gas accumulation of secondary migration theory is used to analyze the low-pressure gas reservoir of Shaximiao Formation in this area.The differences in oil and gas accumulation in the layer section are controlled by structures,reservoir properties,migration pathways,blocking conditions,which formed a combination of factors and the matching conditions.The accumulation of oil and gas possesses following characters:① Main channel sand body in the high part of structure connects with boundary faults at depth.② Sand body of main river channel sedimentation pinch out upwards with well developed small faults and fissures under the sand bodies.③ Stacked channel sand bodies lie in the channel of oil and gas migration.It is thought that the formation and accumulation of gas and oil in the first Member of Shaximiao Formation were controlled by structures,physical property of reservoir,migration channel and shelter conditions.更多还原