南海北部陆坡白云深水区油气成藏条件探讨

位于南海北部陆坡深水区的白云凹陷是珠江口盆地最大的凹陷,近年来在白云凹陷北坡-番禺低隆起已有一系列天然气发现。白云凹陷有着特殊的地质条件和油气勘探意义,故此称其为“白云深水区”。区内古近系文昌-恩平组巨厚烃源岩、浅海三角洲砂岩储层和新近系陆坡大型珠江深水扇储层、东沙运动形成的大量断裂和大型底辟带的存在,以及浅层含气亮点的广泛分布和北坡-番禺低隆起大型天然气藏的发现等显示,白云深水区具有良好的油气成藏条件,有着大油气区的勘探前景。

A discussion about hydrocarbon accumulation conditions in Baiyun Deep-water Area, the northern continental slope, South China Sea

Baiyun sag,the biggest sag in Pearl River Mouth Basin(PRMB),sits on a deep-water area in the northern continental slope,South China Sea.In recent years,a series of gas discoveries have been made in the northern slope-Panyu lower-uplift in Baiyun sag.In this paper,Baiyun sag is called Baiyun Deep-water Area,because it is special in geological conditions and petroleum exploration meanings.In this Area,there are very thick Paleogene source rocks in Wenchang and Enping Formation,Late Paleogene shallow-delta sandstone reservoirs,Neogene large Pearl River Deep-water Fan reservoirs on the continental slope,large faults and diapir zones produced by Dongsha Movement.In addition,bright spots associated with shallow gas are widely spread,and large gas accumulations have been discovered in the northern slope-Panyu lower-uplift of Baiyun sag.All these suggest that Baiyun Deep-water Area is quite good in hydrocarbon accumulation conditions and exploration potential as a large oil & gas province.