华北区石炭、二叠系砂岩的储集性及受控地质因素分析

ANALYSIS ON THE CHARACTERISTICS OF PERMO-CARBONIFEROUS SANDSTONE RESERVOIR AND ITS GEOLOGICAL CONTROLLING FACTORS IN NORTH CHINA

徐辉

Xu Hui

地质矿产部, 华北石油地质局

North China Bureau of Petroleum Geology, Ministry of Geology and Mineral Resources

本文在大量实验数据和区域地质资料的基础上,研究了华北地区石炭、二叠系砂体的沉积史,指出砂岩的储集性受砂岩的结构成熟度、成分成熟度、演化成熟度和表生改造与断裂破碎程度等地质因素控制。在回返型和中隆新凹型地质结构区,寻找成分成熟度中等的高能相带砂体,特别是不整合面下350m范围内的砂岩层,次生孔隙发育,是煤成气的最有利的储集带。在沉降型地质结构区,早期圈闲的高能相带砂体,它是原生煤成气聚集的最好场所。

According to plenty of experimental data and regional geology informations,the depositional history of Permo-Carboniferous sandbodies in North China are studied.It is pointed out the petrophysics perperties of sandstone reservoirs are controlled by geological factors,such as the maturity of lithologic texture,mineral composition and evolution,epigenetic reworks,the intensity of faulting and fracturing.In the newly depressing with the central uprise,it is better to search for the sandbodies in high energy zone with moderate compositional maturity,particularly for the sand beds within the range of 350 m beneath an unconformity,where the secondary porosity is well developed and is favourable for coal gas reservior.In structurally subsiding areas,the sandbody traps in high energy zone formed in early stage are the best site for the accumulation of coal gas.

https://doi.org/10.11781/sysydz198804344