摘要
冀中坳陷的多年勘探实践发现,楔状地层岩性油藏中存在异常油水分异现象。楔状地层岩性油藏的形成应具备的首要条件是存在楔状地层(地层不整合、地层超覆)和岩性上倾尖灭圈闭,再者是丰富的油源驱替赋存于圈闭中的地层水而形成油藏;该油藏最显著的特点是在其顶部存在残存地层水。本文论述了楔状地层岩性油藏的五个分带特征及其形成机制,通过实例阐述了该类油藏的勘探要领。
Many years exploration practice in Jizhong Depression shows that there exists abnormal differential phenomenon of oil and gas in wedge-like stratigraphic-lithologic reservoir. Major necessary conditions for this kind of reservoir is to have wedge-like formation (formation unconformity and overlap) and pinchout trap in updip direction, and a large amount of oil and gas replacing formation water in trap. Its obvious feature is that residual water exists in the too of reservoir. This paper discussed the characteristics of five zonation of wedge-like stratigraphic-lithologic reservoir and its genetic mechanism and pointed its exploration procedure based on examples.
关键词
地层油气藏
油水分布
油气藏形成
楔状地层
岩性
Stratigraphic reservoir, oil and water zonation, differential migration
