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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 of exploration in the Jizhong Depression found that there are abnormal oil-water differences in the wedge-shaped lithologic reservoirs. The formation of wedge-shaped stratigraphic reservoirs should be prerequisite for the presence of wedge-shaped strata (unconformity of strata, stratigraphic overrun) and lithologic upturning trap, and the rich oil source displacement occurs in traps In the formation of reservoirs; the most prominent feature of this reservoir is the presence of residual formation water at its top. In this paper, five zonation characteristics of wedge-shaped lithologic reservoirs and their formation mechanism are discussed. The essentials of exploration for such reservoirs are illustrated by examples.