Geological controls on matrix permeability of Devonian Gas Shales in the Horn River and Liard basins, northeastern British Columbia, Canada
Geological controls on matrix permeability of Devonian Gas Shales in the Horn River and Liard basins, northeastern British Columbia, Canada
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DOI：
10.1016/j.coal.2012.05.006
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发表时间：
2012-12-01
影响因子：
5.6
通讯作者：
Bustin, R. Marc
中科院分区：
文献类型：
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作者：
Chalmers, Gareth R. L.;Ross, Daniel J. K.;Bustin, R. Marc
对加拿大不列颠哥伦比亚省东北部霍恩河和利亚德盆地的泥盆纪页岩气基质渗透率的控制进行了研究。矿物学因高碳酸盐、高石英和中石英、碳酸盐和粘土丰富的地层而异。石英含量在 2% 到 73% 之间变化，碳酸盐含量在 1% 到 93% 之间变化，粘土含量在 3% 到 33% 之间变化。 TOC 含量范围为 0.3 至 6 wt.%，孔隙率范围为约 1 至 7%。对于霍恩河流域样品，石英主要是源自放射虫的生物来源。 TOC 含量随着石英含量的增加而增加，表明 TOC 和石英均来自硅质浮游植物。孔隙度和石英含量之间的正相关关系是由于石英和 TOC 之间的正相关关系。在有效应力为 15 MPa 时，平行于层理的基质渗透率在 7.5E-02 和 7.1E-07 mD 之间变化。渗透率的变化是由多种因素造成的，包括矿物质的来源和分布、孔径分布和结构。汞侵入毛细管曲线表明，在互连孔径大于 16 pm 的样品中出现较高的基质渗透率值 (>2E-03 mD)，即使这些样品可能比低渗透率样品含有更少的大孔。高渗透性样品的织物可以是各向同性的，也可以是各向异性的；然而，各向异性样品的渗透率比各向同性样品对有效应力的变化更敏感。各向异性较高的样品含有适量的石英、碳酸盐，有些样品还含有粘土。与缺乏中孔的样品相比，微孔、中孔和大孔之间比例更平衡的高渗透性样品不仅具有更快的流速，而且更容易接触微孔内的吸附气体。与 Evie 和 Besa 河样品相比，一些 Muskwa 样品含有较高的石英、中等粘土和高 TOC 含量，加上高渗透率、对有效应力的敏感性较低以及微孔、中孔和大孔隙之间的平衡比，因此勘探风险较低，因为断裂倾向更大，由于 TOC 含量较高，因此具有生产和储存碳氢化合物的能力，以及大孔和微孔之间的连通性更强。 有机部分和粘土部分。 (C) 2012 Elsevier B.V. 保留所有权利。
Controls of matrix permeability are investigated for Devonian Gas Shales from the Horn River and Liard basins in northeastern British Columbia, Canada. Mineralogy is varied with high carbonate, high quartz and moderate quartz, carbonate and clay rich strata. Quartz content varies between 2 and 73%, carbonate varies between 1 and 93% and clay varies between 3 and 33%. The TOC content ranges between 0.3 and 6 wt.% and porosity varies between about 1 and 7%. For Horn River basin samples, quartz is mainly biogenic in origin derived from radiolarians. TOC content increases with the quartz content suggesting the TOC and quartz both are derived from siliceous phytoplankton. A positive relationship between porosity and quartz content is due to the positive relationship between quartz and TOC. Matrix permeability parallel to bedding varies between 7.5E-02 and 7.1E-07 mD at an effective stress of 15 MPa. Variation in permeability is due to a complex combination of factors that includes origin and distribution of minerals, pore-size distribution and fabric. Mercury intrusion capillary curves indicate that the higher matrix permeability values (>2E-03 mD) occurs in samples that contain interconnected pore apertures greater than 16 pm even when these samples may contain less macropores than low permeability samples. The fabric of high permeability samples can be either isotropic or anisotropic; however permeability of anisotropic samples is more sensitive to changes in effective stress than isotropic samples. More highly anisotropic samples contain moderate amounts of quartz, carbonate and in some, clay. High permeability samples that contain a more balanced ratio between micro-, meso- and macroporosity would not only have faster flow rates but also greater access to sorbed gas within the microporosity compared to samples that lack mesopores. Several Muskwa samples compared to Evie and Besa River samples contain higher quartz, moderate clay and high TOC content coupled with high permeability, less sensitivity to effective stress and balanced ratios between micro-, meso- and macroporosity would be a lower exploration risk due a greater propensity to fracture, the ability to produce and store hydrocarbons due to higher TOC contents and greater communication between macropores and micropores in the organic and clay fractions. (C) 2012 Elsevier B.V. All rights reserved.