济阳坳陷生烃洼陷的成因类型及生烃潜力比较

对济阳坳陷生烃洼陷的成因类型及生烃潜力作了研究，发现该坳陷由于块断活动的差异性和不均衡性，形成了多凸多凹（洼）相间分布排列的构造格局。其中洼陷是沉降中心和生烃中心，控制着油气的形成和分布。通过对济阳坳陷14个生烃洼陷的沉积演化、有效烃源岩分布、埋藏史和生烃史等分析研究，识别出持续沉降-深埋藏型、间断沉降-深埋藏型和逐渐抬升-中浅埋藏型等3大成因类型的生烃洼陷，在此基础上，结合生烃过程又可分为持续快速深沉降型、持续沉降型、间断深沉降型、间断沉降型和逐渐抬升型等5种成因类型的生烃洼陷。其中深沉降型基本都是富油洼陷，而逐渐抬升型则难以形成大规模的油气聚集。利用二级模糊评判方法，得到济阳坳陷68个评价单元的有效烃源岩综合评价结果，其中利津洼陷沙三下(Es₃下)烃源岩具有良好的生烃物质基础和非常有利的生烃过程，是济阳坳陷内最好的生烃单元。

RESEARCH ON THE GENETIC TYPE AND HYDROCARBON GENERATION POTENTIAL OF THE HYDROCARBON GENERATION SAG IN JIYANG DEPRESSION

In order to precisely evaluate the hydrocarbon generation potential of Jiyang depression, the genetic type and hydrocarbon generation potential in the hydrocarbon generation sag of the Jiyang depression are extensively researched in this paper. The result shows that the tectonic framework of interval distribution between many uplifts and sags was formed owing to the differences and heterogeneities of fault block actions. Among them, the sag, controlling the petroleum formation and distribution, was the settling and hydrocarbon generative centre. Through analyzing the sedimentary evolution, distribution of effective source rock, burial history and hydrocarbon generation history of 14 hydrocarbon generation sags in Jiyang depression, 3 main genetic types of hydrocarbon generation sag, such as continual settling-deep burial type, interval settling-deep burial type and continual rising-middle shallow burial type are recognized. On the basis of combining the recognition with hydrocarbon generation process, the hydrocarbon generation sags are also divided into 5 types in genetic way, i.e. continual-fast settling type, continual settling type, interval and deep settling type, interval settling type and gradually rising type. Generally, the deep settling type mostly belongs to the sags with rich oil, whereas the gradually rising type is difficult to form large-scale oil-gas accumulation. Using secondary fuzzy recognition way, the synthetic evaluation data of 68 effective hydrocarbon source rock units in Jiyang Depression are obtained. Among them, the lower source rock of the 3rd section of Shahejie Formation in Lijin sag (the lower of Es_3) owned good hydrocarbon generation physical elements and favorable hydrocarbon generation process, being the best hydrocarbon generation unit.