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在分析凤冈区域地质构造演化的基础上,对下寒武统牛蹄塘组的页岩层裂缝特征进行了研究。研究表明:多期次强烈的构造运动使该区域断裂发育复杂,造成多个断裂体系相互交错、切割,从而形成以隔槽式为主的褶皱形体;从储层裂缝特征来看,主要以构造裂缝为主,横裂缝、垂直裂缝占主体,部分岩心破碎严重,并且裂缝大部分被其他矿物成分充填,以石英、方解石充填所占比例高。
On the basis of analyzing the geological evolution in Fenggang area, the characteristics of shale fractures in Niutitang Formation of Lower Cambrian are studied. The results show that the multistage intense tectonic movement complicates the fault development in this area, resulting in multiple fault systems interlacing and cutting, thus forming a groove-shaped fold body. According to the characteristics of reservoir fractures, Cracks are the main part. The horizontal cracks and vertical cracks account for the main part, and some of the cores are broken severely. Most of the cracks are filled with other mineral components, accounting for the high proportion of quartz and calcite.