大港探区煤系地层生烃史类型及油气地质意义

The Hydrocarbon Generating History of Coal-bearing Strata and Its Petroleum Geological Significance in Dagang Fields

勘探实践证实石炭—二叠系煤源岩是大港探区非常重要的烃源岩,该套烃源岩经历了复杂的埋藏史、热史和生烃史,具有多期次的生烃过程。结合区域构造及热演化地质背景和单井埋藏史,分析大港探区煤系地层的生烃热演化史类型以及有利生烃区的勘探潜力,认为大港探区上古生界具有4种生烃史类型,即持续深埋型、早抬晚埋型、间歇埋藏型和早埋晚抬型。

Practice shows that the coal-bearing source rock is very important in Dagang fields. It had experienced a complicated history of bury, thermal maturation and hydrocarbon generation of multiple episodes. This paper mostly combines with the regional tectonic and the thermal evolution of geological background so as to analyze the burial history of a single well, and holds comprehensive discussion on thermal evolution history of hydrocarbon generation types and favorable area of hydrocarbon exploration potential. The study considers that it has four hydrocarbon gen- eration history types in Upper Paleozoic： continuous deep-burial type, early-lift and late-burial type, batch-burial type and early-burial and late-lift type.