河东煤田煤系页岩气储层非均质性与可改造性研究

发布时间：2018-03-16 17:32

  本文选题：煤系页岩气　切入点：非均质性　出处：《中国矿业大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国海陆过渡相页岩气资源丰富(约为8.9×10~(12) m~3),主要赋存于煤系页岩。煤系页岩在宏观和微观尺度均存在显著的非均质性,对储层的可改造性影响较大。论文以河东煤田石炭-二叠系太原组与山西组泥页岩为研究对象,运用钻孔统计、实验测试、理论分析的方法,研究储层的非均质性和可改造性特征,优选优质储层,探讨非均质性对可改造性的影响机理,得到如下认识:依据页岩连续厚度和夹层情况,将煤系页岩储层由上至下划分为Ⅰ、Ⅱ、Ⅲ和Ⅳ四个层段,页岩厚度分别为26.79 m、17.42 m、11.13 m、25.32 m;厚度变异系数分别0.56、0.33、0.79、0.69。太原组底界平均埋深676 m。有机质类型Ⅲ型为主;TOC平均为3.27%,TOC变异系数平均为0.49;R_o平均为1.93%,处于高成熟-过成熟阶段。石英含量平均为40.63%,变异系数平均为0.11;黏土矿物含量平均为46.88%,变异系数平均为0.16。比表面积平均为4.65 m~2/g,变异系数平均为0.43;总孔容平均为0.007 m L/g,变异系数平均为0.26;孔径平均为20.25 nm,变异系数平均为0.44;孔隙度平均1.62%,变异系数平均为1.01。渗透率分布范围0.019~3.67×10~(-3) m D,平均0.331×10~(-3) m D;渗透率变异系数0.00~1.92,平均为0.92。自第Ⅰ至第Ⅳ层段,储层特征综合评价系数为Q_1=(0.69,0.48,0.31,0.58),储层非均质性综合评价系数为Q_2=(0.42,0.65,0.32,0.63),综合评价系数Q_(综合)=(0.55,0.57,0.32,0.60)。矿物可压裂性依次为0.57、0.28、0.33、0.66,岩石力学可压裂性依次为0.55、0.50、0.49、0.34,综合可压裂性依次为0.65、0.39、0.44、0.52。厚度、TOC和含气量、石英含量等参数非均质性越小,比表面积、孔隙度、平均孔径和渗透率非均质性越大,孔裂隙的构成越复杂,对压裂越有利。综合宏观储层展布和微观储层特征及其非均质性特征,认为第Ⅱ层段为优先压裂段。论文获得了河东煤田煤系页岩气储层的空间展布、储层地化、储层物性及可改造性特征,阐明了储层宏观非均质性和微观非均质性特征,获取了优质层段和优选压裂段,揭示了储层非均质性对可改造性影响的微观机理,其认识为煤系页岩气储层评价开发和优选优质储层提供依据。
[Abstract]:China is rich in marine and continental transitional shale gas resources (about 8.9 脳 10 ~ (12)) m ~ (3), which mainly occurs in coal shale, which is characterized by significant heterogeneity at macro and micro scales. The shale of Carboniferous-Permian Taiyuan formation and Shanxi formation in Hedong coalfield is taken as the research object, and the methods of borehole statistics, experimental test and theoretical analysis are used. By studying the characteristics of reservoir heterogeneity and revamability, selecting high quality reservoirs, and discussing the influence mechanism of heterogeneity on revamability, the following conclusions are obtained: according to the continuous thickness of shale and intercalation, The coal measures shale reservoir is divided from top to bottom into four formations: 鈪，

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