摘要
本文研究了陕甘宁盆地上古生界及中生界两套煤系地层石英砂岩成岩作用特征及其孔隙演化的控制因素。应用煤岩、腐殖型气源岩成烃演化成熟度与自生矿物析出的关系,将中成岩期划分三个阶段:早期沉积物机械压实阶段,中期溶蚀胶结阶段和晚期碳酸盐交代阶段。本文对各阶段孔隙演化做了定量研究,并建立了“压实后粒间余孔”这一孔隙演化的过渡性参数,压实后粒间余孔大小,反映着压实程度强弱,控制着孔隙演化的格局。
This paper dealt with the diagenetic features of the sandstones in 2 coal -bearing formations in Upper Paleozoic and Mesozoic Series respectively in Shan-Gan-Ning basin and the factors governing the evolution of their pore structure.Their intermediate diagenetic period is divided into 3 stages according to the petrology of these formations,maturity of the hydrocarbon evolution in the humic source rocks and the separation of the authigenic minerals:①an early stage of mechanical compaction of the sediments;②a medium stage of their corrosion and cementation;and ③a stage of substitution of the carbonates.A quantitative statistic of the pore evolution in each stage is presented in this paper and a parameter“surplus intergranular pores after compaction”is suggested by the author to indicate the magnitade of the surplus pores after compaction which is a controlling factor of the evolution of the pore structure,reflecting the degree of compaction.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1989年第6期31-40,共10页
Petroleum Exploration and Development
