珠江口盆地第三系砂岩成岩作用及深部地层储集性初探

Diagenesis of Tertiary Sandstones and Properties of Tertiary Deep Reservoir in the Pearl River Mouth Basin

本文较系统地讨论了珠江口盆地第三系砂岩的几种主要成岩作用特征,将砂岩的成岩顺序概括为两种模式,并通过各种成岩标志的综合分析,划分了成岩期。同时,将成岩机理分析与系统的声波解释孔隙度相结合,阐述了砂岩储油物性随深度变化的一般规律,进而从成岩角度提出了3000m以下较为有利的储集相带、层位和地区。

Main, characteristics of diagenesis of Tertiary sandstones in the Pearl River Mouth Basin have been discussed systematically and the diagenetic sequence of these sandstones has been divided into two models. Using comprehensive analysis of the various diagenetic markers, the diagenetic stages have been determined. On the bases of combination of diagenetic mechanism with systematic interpretation of ecoustic porosity, we have expounded the general pattern of reservior property change with depth of burial. According to the diegenetic characteristics, favourable reservior fecies belts, horizons and areas beneath 3000 meters have been pointed out.