珠江口盆地番禺低隆起—白云凹陷北坡天然气晚期成藏特征

通过断层活动性研究、油气充注史分析及典型气藏剖析,论证了珠江口盆地番禺低隆起—白云凹陷北坡天然气藏属典型的晚期成藏。新近纪以来白云凹陷一直处于主生、排烃期和东沙运动引起的断裂活动是该区天然气晚期成藏的必要条件,二者的相互匹配是该区晚期成藏的充分条件。建议在该区以断层为依托,以晚期天然气平面运移路径为指向,寻找保存条件有利的地区进行甩开勘探。

Late gas accumulation characteristics in Panyu low-uplift and the north slope of Baiyun sag, Pearl River Mouth basin

It has been documented that the gas pools are characterized by late accumulation in Panyu low-uplift and the north slope of Baiyun sag,Pearl River Mouth basin,by researching fault activities and analyzing hydrocarbon charge history and some typical gas pools.Baiyun sag has been in the main stage of hydrocarbon generation and expulsion since Neogene,which and the fault activities caused by Dongsha Movement,are the necessary conditions for late gas accumulation in the area.Meanwhile,the time match between the two factors is also indispensable for the late gas accumulation.Consequently,it is suggested that some zones with favorable preservation conditions should be found to carry on wide-open exploration in the area,based on the faults and the planar paths of late gas migration.