天然气盖层质量的影响因素及盖层形成时间的探讨——以济阳拗陷为例

本文利用盖层及储层的实验分析资料,对济阳拗陷天然气盖层质量的影响因素及盖层的形成时间作了初步探讨。泥岩矿物组成等资料分析表明,盖层质量优劣受沉积环境、泥岩压实及成岩作用强弱的影响;储层排替压力和盖层突破压力的实验资料分析表明,当合适的淤泥沉积成层时,它已成为盖层。 

DISCUSSION ON THE INFLUENTIAL FACTORS OVER THE QUALITY OF NATURAL-GAS CAPROCKS AND THE TIME OF THE CAPROCK FORMATION

Based on the experimental analysis of caprocks and reservoir rocks of natural gas, the authors of this paper study the influential factors over the quality of natural-gas caprocks and the time of their formation in the Jiyang Depression. The analysis data of the mineral compositions of argillites reveal that the quality of natural-gas caprocks is dominated by sedimentary environment, compaction and diagenesis levels of argillites.Furthermore, the experimental analysis on the expulsion pressure and the breaking pressure of the reservoir rocks suggest that the caprocks could be taken as capping beds as the suffient sludges deposit and become stratified sequences.