南方陆相盆地油气地质特点

THE GEOLOGICAL CHARACTERISTICS AND HYDROCARBON PROSPECT OF THE CONTINENTAL BASINS IN SOUTHERN CHINA

南方中、新生代陆相盆地包含中、新生代陆相地层及陆盆下伏中、古生代海相地层两个领域。从生储盖组合关系、盆地叠置类型、储集相体及控制含油气盆地形成与发展之深大断裂带等诸方面论述了这些盆地的油气地质特点。有含油气远景的盆地占这些盆地总面积的57.5%,且都在区域负向构造中,其中包含了可供油气勘探的多种油气(包括油页岩)资源,并已找到一定数量的控制和探明储量,目前已找到的油资源仅占预测资源量的约2.3%,气储量不到0.5%,油气勘探前景巨大。研究认为,找油气工作放在中、新生代盆地较为现实。陆相地层找油气要看生油条件的优劣,而海相地层找油气取决于其后期之构造演化和保存条件。

There are two fields,Mesozoic-Cenozoic continental sequences and their underlying Paleo- zoic-Mesozoic marine sequences,in the Mesozoic-Cenozoic continental basins in southern China,The petroleum geology features have been discussed based on the relationships of source-reservoir-cap as- semblage,types of basin superposition,facies of reservoir bodies and the deep fracture belts controlling the formation and development of the petroliferous basins.The prospective basins account for 57.5%of all the basins in area.They are all in regional negative structures,involving polygenetic resources including oil shale.There has been a certain amount of controlled and proved reserves,but it is only in about 2.3%of the oil resources and less than 0.5%of the gas resources predicted.Therefore,it is believed that there is still great prospect in these regions and the Mesozoic-Cenozoic continental basins might be practical for the coming exploration.The conditions of hydrocarbon generation should be paid more attention to in the exploration of continental sequences,and the post-tectonic evolution and present preservation conditions are more important in that of marine sequences.