中国海相油气田勘探实例之十四 珠江口盆地深水区流花16-2轻质油田的发现与勘探

流花16-2油田发现于2010年5月。它是南海北部珠江口盆地近年发现的中型轻质油田,也是该区自营勘探以来发现的储量最大的油田。油田位于珠江口盆地番禺低凸起东端海域深水区,流花16-2构造为断块圈闭,储层为下中新统珠江组下段及上渐新统珠海组海相中细砂岩和生物碎屑灰岩,盖层为珠江组上段巨厚层海相泥岩,具有良好的储盖组合。油源来自油田南面的白云凹陷东凹古近系恩平组—文昌组烃源岩。油藏具有埋深浅、储量丰度高、原油密度低、测试产能高等特点。论述了油田的发现与勘探历程以及油田的基本地质特征,总结了取得勘探突破的实践认识与启示。

Cases of Discovery and Exploration of Marine Fields in China,Part 14:Liuhua 16-2 Light Oil Field in Pearl River Mouth Basin,Northern South China Sea

Liuhua 16-2 Oil Field was discovered in May 2010 in Pearl River Mouth Basin,northern South China Sea.It is a middle scale one that yields commercial light crude oil.It is also the one with the largest petroleum reserves in the basin since self-supporting exploration by CNOOC.The Liuhua 16-2 is a fault block trap locating in deep-water area at the east end of Panyu Low Uplift,Pearl River Mouth Basin.Reservoirs are composed of the lower Miocene lower Zhujiang marine sandstone and the lower Oligocene Zhuhai bioclastic limestone and the cap is composed of the thick upper Zhujiang marine mudstone,both of which are of a good reservoir-cap assemblage.It is indicated that the oil in Liuhua 16-2 reservoirs derives from the Paleocene Enping and Wenchang mudstone source rocks in the east of Baiyun Depression to the south of this oil field.The oil pools of it are characterized of shallow buried depth,high oil reserves abundance,low oil density and high tested oil output.The exploration and exploitation history of the oil field and the general geological characteristics are reviewed,and also the experience and enlightenment during exploration and development are discussed and summarized.