摘要
渤海湾盆地南堡凹陷为第三纪形成的箕状凹陷,是黄骅坳陷的二级构造单元之一。对南堡凹陷外围地区古生界油气成藏进行了研究,结果表明外围地区古生界碳酸盐岩不具备油气生成能力,油源则来自于南堡凹陷下第三系,通过断层和不整合面进行长距离运移,并在构造高点进行富集,形成新生古储型油气藏;碳酸盐岩基质孔隙度差,原生孔隙基本不具备油气储集性能,晚期未充填构造裂缝是油气运移与聚集的主要场所;岩溶发育垂向分带不明显,溶蚀孔洞孤立且连通性差;发育有不整合油藏以及构造块状油藏2种油气藏类型。
Nanpu sag in Bohaiwan basin is a Tertiary halfgraben-type fault sag, and is also one of the sub- tectonic units of Huanghua depression. The Paleozoic hydrocarbon pool was studied. The source rock in the peripheral areas of Nanpu sag isn＇t the carbonates but the Lower Tertiary strata. Fault and unconformi- ty are the main long-distance migration pathways, and oil accumulates at the high position of structure, which forms the reservoir of young source and old reservoir type. It is characterized by the lower matrix porosity for carbonates, and the primary pore hasn＇t the reservoir capacity. The late-formed unfilled tec- tonic fracture is the dominant reservoir space for oil migration and accumulation. The paleokarst zone can＇t be explicitly divided in vertical, and corroded cavity is isolated, with worse connectivity. In this zone, the reservoir types mainly consist of unconformity reservoir and structural reservoir.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2009年第1期108-112,共5页
Natural Gas Geoscience
基金
高等学校博士学科点专项科研基金项目(编号:20040533009)资助
关键词
南堡凹陷
油气成藏
碳酸盐岩
古生界地层
Nanpu sag
Hydrocarbon accumulation
Carbonates
Paleozoic strata.
