扬子地区下寒武统与下志留统黑色页岩孔隙度与有机碳关系差异性及原因

发布时间：2018-03-08 10:08

本文选题：页岩　切入点：孔隙度　出处：《地球科学》2017年07期 　论文类型：期刊论文

【摘要】：下寒武统牛蹄塘组与下志留统龙马溪组页岩是扬子地区发育的两套富有机质黑色页岩,由于其分布面积广、厚度大、有机质丰度高而成为页岩气勘探的重点层位.然而牛蹄塘组孔隙度表现出了与龙马溪组截然不同的规律,两套页岩的孔隙结构、有机碳含量、密度也存在显著差异.结合测井、埋深(上覆压力)、孔隙度、有机碳及成熟度测试数据进行了对比分析.结果显示,牛蹄塘组过高的有机碳含量和热演化程度严重影响了页岩的孔隙结构,使有机质碳化,有机质孔发生坍塌和充填;牛蹄塘组埋深大、上覆压力也大,导致无机孔被压实,因此其总孔隙度明显小于龙马溪组.
[Abstract]:The Lower Cambrian Niutetang formation and Lower Silurian Longmaxi formation shale are two sets of organic matter rich black shale developed in Yangzi area. However, the porosity of Niulitang formation is quite different from that of Longmaxi formation. The pore structure, organic carbon content and density of the two sets of shale have significant differences. The buried depth (overlying pressure, porosity, organic carbon and maturity test data) are compared and analyzed. The results show that the excessive organic carbon content and thermal evolution degree of Niulitang formation seriously affect the pore structure of shale and carbonize organic matter. The hole of organic matter collapses and fills, and the buried depth and overlying pressure of Niulitang formation are large, which results in the compaction of inorganic pore, so its total porosity is obviously smaller than that of Longmaxi formation.
【作者单位】：中国地质大学资源学院;中国地质大学构造与油气资源教育部重点实验室;中国地质调查局油气资源调查中心;
【基金】：中国地质调查局油气基础性公益性地质调查项目(No.DD20160185) 国家重大油气专项(No.2016ZX05034-002-003) 国家自然科学基金项目(No.41672134) 国家基础地质调查项目(No.12120114055801) 高等学校创新引智计划(No.B14031)
【分类号】：P618.13

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