珠江口盆地白云凹陷珠江组抱球虫灰岩沉积物的矿物组成及特征分析

Mineral composition and charactertics of globigerinid limestone deposits of Zhujiang Formation in Baiyun Sag, Pearl River Mouth Basin

珠江口盆地白云凹陷作为我国深水勘探研究的重要战略目标区之一,该区域中新统珠江组广泛存在的抱球虫灰岩主要为含泥、粉砂质抱球虫灰岩和抱球虫粉砂质泥质灰岩两类,前者具有较高的孔隙度和储集性,为一类潜在深水相储集层,后者原生孔隙保存较差,不太有利于储层发育。珠江组抱球虫灰岩后生成岩作用以机械压实作用为主,压溶作用为辅。

The Baiyun Sag of Pearl River Mouth Basin is one of the key strategic goals in the deep-water exploration in China. The globigerinid limestone deposits, which are widely existed in the Miocene Zhujiang Formation, are Mainly divided into silt, silt with the ball of coccidia and clover-bearing gravel muddy limestone. The former has high porosity and reservoir property, and is a kind of potential deep water reservoir. While there is poorly preserved and is not conducive to reservoir development in the latter porosity. The post-diagenesis of the pelagic limestone in Zhujiang Formation is mainly mechanical compaction, and the pressure solution is secondary.