中国海相层系油气基本特点与潜力

中国境内古生代和中生代的大陆边缘沉积、地台盖层大多已褶皱成山,因而海相叠合残留盆地的油气地质条件的特殊性就成为中国石油天然气地质的一大特色。在地质历史发展过程中,具有最佳的源岩、储层、盖层发育条件,同世界主要油气富集带的其他盆地一样,具有良好的早期资源物质基础与成藏条件。中国海相碳酸盐岩层系形成时间早、地层时代老,勘探目的层埋藏深,尤其是经过多期的构造运动的叠加改造,油气成藏规律复杂,造就了中国海相碳酸盐岩层系油气勘探的特殊性。近期勘探成果表明,中国海相层系具备发育大中型油气田的物质基础,在适宜的条件下仍可形成大规模的油气聚集。构造差异性演化使海相盆地含油气性及油气产出规模等方面,存在明显差异。四川盆地、鄂尔多斯盆地海相以气为主,塔里木盆地油气兼有。主要大中型油气田的勘探主要应聚焦在海相层系发育的塔里木盆地、四川盆地及周缘、鄂尔多斯盆地。

Essential Feature and potential of hydrocarbon accumulation in China marine sequences

Paleozoic and Mesozoic sediments of continental margins and platform covers are mostly folded into mountains in China,and the unique marine superimposed-residual basins become a significant feature of China petroleum geology.During the geological evolution,the ancestors of these basins once had excellent source,reser- voir and seal rocks,with their conditions of hydrocarbon resources and accumulation as good as those of other ba- sins in world petroleum provinces.However,the marine carbonate sequences in Ch...