不同层理方向的煤岩渗透特性研究

发布时间：2019-03-06 21:54

【摘要】：焦作矿区的山西组二_1煤层具有厚度大、结构简单、分布稳定等特点,其开采潜力较大。对目标煤层渗透率参数的获取是对水力压裂裂缝预测的先决条件。采用室内试验,对该区块的天然岩芯进行渗透特性研究。结果表明:储层的渗透性较好,有利于水力压裂改造的实施。影响渗透率的主要因素为层理角度、孔隙度、裂纹及微裂缝的发育程度等,其中裂纹和微裂缝的贯通程度对渗透率影响最大,层理角度次之。针对平行层理方向和垂直层理方向上渗透率的较大差异,分别建立了水气渗流的并联和串联阻流模型,揭示了影响渗透特性差异的主要原因为层理构造。本研究可为目标煤层确定合理的开采方式及确定水力裂缝的起裂与扩展规律提供理论支持。
[Abstract]:The second _ 1 coal seam of Shanxi formation in Jiaozuo mining area has the characteristics of large thickness, simple structure and stable distribution, so it has great mining potential. The acquisition of the permeability parameters of the target coal seam is a prerequisite for the prediction of hydraulic fracturing fractures. The permeability characteristics of natural core in this block were studied by laboratory test. The results show that the permeability of the reservoir is good, which is beneficial to the implementation of hydraulic fracturing. The main factors affecting permeability are bedding angle, porosity, development degree of cracks and micro-fractures, and so on. The penetration degree of cracks and micro-fractures has the greatest influence on permeability, followed by bedding angle. In view of the great difference of permeability in parallel bedding direction and vertical bedding direction, the parallel and series blocking flow models of water-gas seepage are established, respectively, and the main reason influencing the difference of permeability characteristics is the bedding structure. This study can provide theoretical support for the determination of reasonable mining mode and the law of crack initiation and expansion of hydraulic fractures in the target coal seam.
【作者单位】：武汉理工大学资源与环境工程学院矿物资源加工与环境湖北省重点实验室;
【基金】：中国博士后科学基金(2016M592402)资助
【分类号】：TD712

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