阿拉伯板块被动陆缘盆地油气差异富集主控因素

Differential hydrocarbon enrichment and controlling factors in passive margin basins of the Arabian Plate

通过对阿拉伯板块被动陆缘盆地内含油气系统的系统表征和类比分析,结合中东地区油气田最新资料和前人研究成果,揭示阿拉伯板块被动陆缘盆地构造沉积演化、源盖成藏要素和油气富集的相关关系,探索盆地油气差异富集的主控因素。阿拉伯板块被动陆缘盆地群发育内克拉通、弧后、被动陆缘和活动陆缘4个超级含油气系统,其中被动陆缘和内克拉通超级含油气系统油气最为富集;区域上油气主要富集于中阿拉伯盆地和鲁卜哈利盆地,层系上石油主要储集于白垩系和侏罗系,而天然气则主要富集于二叠系和三叠系;阿拉伯板块被动陆缘盆地群油气的差异富集主要受3个因素的控制,即优质烃源岩的展布与盆地的正向构造带控制油气的区域分布,区域盖层控制油气的层系分布。

The integrated analyses,classification and comparison of petroleum systems,combined with the latest oil and gas field data from the Middle East and the previous research results,indicate how tectonic-depositional evolution,source rocks and seals,and petroleum resource endowment are inter-linked.The impacts of these factors on the enrichment of petroleum resources could be established.There are four super petroleum systems in the passive margin basins of the Arabian Plate,namely,the intra-craton,the back-arc,the passive margin and the active margin,among which the passive margin and intra-craton super petroleum systems are the most significant.Regionally,oil and gas in the study area are mainly concentrated in the Central Arabian Basin and the Rub’Al Khali Basin.Stratigraphically,oil is mainly reservoired in the Cretaceous and Jurassic whereas the gas in the Permian and Triassic.The diffe-rential enrichment of hydrocarbons is mainly controlled by three factors:the distribution of high-quality effective source rocks and the positive structural trends of basins,which have a dominant control on the regional distribution of oil and gas,and the regional seals,which govern the stratigraphic distribution of oil and gas.