中国南方志留系泥质岩盖层动态评价研究

Dynamic Evaluation to the Cap Formation of Silurian Argillaceous Rock,Southern China

在前人研究成果的基础上,针对目前天然气勘探研究的现状,总结确定了泥质岩演化阶段与封堵性能的对应关系。根据地质条件下岩石平均孔隙的直径与油气分子的大小,动态地评价了中国南方志留系盖层单剖面封盖条件,重点评价了从加里东期、海西期、印支期、燕山期到现今的川东北地区、黔中隆起及其周缘地区和江汉地区志留系盖层封盖能力的变化情况,认为这种评价可为天然气勘探提供理论依据。

On the basis of predecessors researches, this article studies the correlation between evolvement stages and sealing ability of the argillaceous rock. According to the average pore diameter and the oil-gas molecular under geological conditions, it analyzes the changes of diagenetic degree, cvolving stage and sealing ability of the Silurian argillaceous rock in historical stages, and provides dynamic evaluation of the changes of the diagenesis and cap capability in different historical phases （the end of S, T2, J, E and nowadays）, providing a theoretical basis for natural gas exploration.