ZJD构造浦口组及泰州组砂岩低孔低渗的成因分析

The Genesis Analysis of Low-porosity, Low-permeability Sandstone for PuKou Formation, TaiZhou Formation in ZJD Structure

文章从微观角度和成岩演化史两方面分析了ZJD构造浦口组、泰州组砂岩低孔低渗的原因。综合得出压实作用不仅是储层物性降低的主要原因 ,而且更容易使矿物成熟度差的砂岩产生致密化 ;随埋藏深度加大 ,在无烃类聚集的情况下 ,砂岩成岩作用将持续进行 ;同时 ,泥岩中的薄层砂岩和厚层泥岩中砂岩的顶底处于泥岩压实流体进入砂岩的前哨 。

This paper analyses the cause of low-porosity, low-permeability of sandstone from both sides of miscrocosmis angle and the evolution of diagenesis. And synthetically concluded that compaction not only get the container rock's physical property worse, but also apt to get less maturity sandstone densify. With enlargement of the buried depth,, diagenesis of sandstone will be continue at the circumstance that no hydrocarbon compound accumalated. At the same time, when the top and bottom of sandstone within the mudstone is located the output from which compacted fluid enter into sandstone, the sandstone easy to be densified.