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Fracture-Induced Permeability in Whitby Mudstone

机译：在Whitby Mudstone中骨折诱导的渗透率

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摘要

Shale host rock and containment potential are largely determined by the connected pore network in the rock, and the connection between the pore network and the naturally present or mechanically induced fracture network together determines the total bulk permeability. Pore connectivity in shales is poorly understood because most of the porosity is present in sub-micrometer-sized pores that are connected through nanometer-sized pore throats. We have used a number of different techniques to investigate the microstructure and permeability of Early Jurassic shales from the UK (Whitby Mudstone), under intact and fractured conditions. Whitby Mudstone is a clay matrix-rich rock (50-70%), with different mineralogical layers on the sub-millimeter scale and very low natural permeability (10~(19) to 10~(22) m~2), representative of many gas shales and caprocks present in Europe. Artificial fracturing of this shale increases its permeability by 2-5 orders of magnitude at low confining pressure (5 MPa). At high confining pressures (30 MPa), permeability changes were more sensitive to the measuring direction with respect to the bedding orientation. Given the distinct lack of well-defined damage zones, most of the permeability increase is controlled by fracture permeability, which is sensitive to the coupled hydro-chemo-mechanical response of the fractures to fluids.
机译：页岩宿主岩石和容纳电位主要由岩石中的连接的孔网络确定，并且孔网络与天然存在或机械诱导的裂缝网络之间的连接在一起决定了总散热性。 Shales中的孔连接很差，因为大多数孔隙率存在于通过纳米尺寸的孔喉部连接的亚微米尺寸的孔中。我们使用了许多不同的技术来研究完整和破碎条件下英国（Whitby Mudstone）早期侏罗纪神经结构和渗透率。 Whitby Mudstone是一种富含粘土矩阵的岩石（50-70％），亚毫米尺度的不同矿物层，自然渗透率非常低（10〜（19）至10〜（22）m〜2），代表许多汽油和脚轮在欧洲存在。该页岩的人为压裂在低限制压力（5MPa）下将其渗透率增加了2-5级。在高限制压力（30MPa）中，相对于床上用品方向，渗透性变化对测量方向更敏感。鉴于明确缺乏明确的损伤区，大部分渗透性增加是通过断裂渗透控制的，这对骨折与流体的耦合水化 - 化学机械响应敏感。

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  • 来源
    《Environmental Science & Technology》 |2020年第15期|9564-9572|共9页
  • 作者

    Maartje E. Houben; Jasmijn C. M. van Eeden; Auke Barnhoorn; Suzanne J. T. Hangx;

  • 作者单位

    Department of Earth Sciences Utrecht University 3585 CB Utrecht The Netherlands;

    Department of Earth Sciences Utrecht University 3585 CB Utrecht The Netherlands;

    Department of Geoscience and Engineering Delft University of Technology 2628 CN Delft The Netherlands;

    Department of Earth Sciences Utrecht University 358S CB Utrecht The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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