宜城市-京山县页岩气资源调查区五峰组-龙马溪组页岩气保存条件分析

摘要

宜城市-京山县调查区古生界五峰组-龙马溪组页岩发育范围广,烃源岩品质较好.通过收集近年来调查区页岩气评价项目相关资料和数据,分析了五峰组-龙马溪组页岩保存条件.结果表明:该区页岩厚度大,有机质丰度较高,生气条件较好,有机质微孔隙较多,顶底板盖层封堵性较好,具备生气、储气条件;但是由于本区岩石的裂缝发育,构造变形强烈,构造复杂,不利于页岩气的保存,这也是本区未见良好气显示的一个重要原因.%The shale in Paleozoic Wufeng and Longmaxi formations has widely developed in the Yicheng-Jingshan shale gas investigation area,and source rock quality is rather good.Based on investigation area shale gas assessment projects related information and data in recent years,analyzed the preservation condition in the formations.The result has shown that shale in the area has large thickness,higher organic matter abundance,better gas generation condition,more organic matter microfissures,roof,floor and overburden have better sealing ability,thus possess gas generation and preservation conditions.But because of developed fissure in rocks,stronger structural deformation in the area and complicated structures count against to shale gas preservation,thus the major reason without good gas indications in the area.