Variability in spatial distribution of mineral phases in the Lower Bowland Shale, UK, from the mm- to mu m-scale: Quantitative characterization and modelling

Fauchille A. L.; van den Eijnden A. P.; Ma L.; Chandler M.; Taylor K. G.; Madi K.; Lee P. D.; Rutter E.

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Variability in spatial distribution of mineral phases in the Lower Bowland Shale, UK, from the mm- to mu m-scale: Quantitative characterization and modelling

机译：从MM-to Mu M级从MM-to Mu M级中矿物阶段空间分布的变异性：定量表征和建模

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The microstructure of a highly laminated Lower Bowland Shale sample is characterized at the micron-to millimeter scale, to investigate how such characterization can be utilized for microstructure-based modelling of the shale's geomechanical behavior. A mosaic of scanning electron microscope (SEM) back-scattered electron (BSE) images was studied. Mineral and organic content and their anisotropy vary between laminae, with a high variability in fracturing and multi-micrometer aggregates of feldspars, carbonates, quartz and organics. The different microstructural interface types and heterogeneities were located and quantified, demonstrating the microstructural complexity of the Bowland Shale, and defining possible pathways for fracture propagation. A combination of counting-box, dispersion, covariance and 2D mapping approaches were used to determine that the total surface of each lamina is 3 to 11 times larger than the scale of heterogeneities relative to mineral proportion and size. The dispersion approach seems to be the preferential technique for determining the representative elementary area (REA) of phase area fraction for these highly heterogeneous large samples, supported by 2D quantitative mapping of the same parameter. Representative microstructural models were developed using Voronoi tessellation using these characteristic scales. These models encapsulate the microstructural features required to simulate fluid flow through these porous Bowland Shales at the mesoscale.

机译：高度叠层的下鲍兰页岩样品的微观结构在微米到毫米刻度上表征，以研究这些表征如何用于页岩的地质力学行为的基于微观结构的建模。研究了扫描电子显微镜（SEM）背散射电子（BSE）图像的马赛克。矿物质和有机含量及其各向异性在薄层之间变化，具有很高的压裂和多千米尺聚集体，碳酸盐，石英和有机物的含量高。定位和量化不同的微观结构界面类型和异质性，证明了鲍兰页岩的微观结构复杂度，并限定了用于断裂繁殖的可能途径。计数箱，分散，协方差和2D映射方法的组合用于确定每个薄片的总表面比相对于矿物比例和尺寸的异质性比例大3至11倍。分散方法似乎是用于确定这些高度异构大型样品的相位面积分数的代表性基本区域（REA）的优先技术，由2D定量映射的相同参数的定量映射。使用这些特征尺度使用Voronoi Tessellation开发了代表性的微观结构模型。这些模型封装了通过在Mesoscale在Mesoscale上通过这些多孔弓箭子的流体流动所需的微观结构特征。

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《Marine and Petroleum Geology》 |2018年第2018期|共19页
作者
Fauchille A. L.; van den Eijnden A. P.; Ma L.; Chandler M.; Taylor K. G.; Madi K.; Lee P. D.; Rutter E.;
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Univ Manchester Sch Mat Manchester Xray Imaging Facil Oxford Rd Manchester M13 9PL Lancs England;

Delft Univ Technol Fac Civil Engn &

Geosci Stevinweg 1 NL-2628 CN Delft Netherlands;

Univ Manchester Sch Mat Manchester Xray Imaging Facil Oxford Rd Manchester M13 9PL Lancs England;

Univ Manchester Sch Earth &

Environm Sci Oxford Rd Manchester M13 9PL Lancs England;

Univ Manchester Sch Earth &

Environm Sci Oxford Rd Manchester M13 9PL Lancs England;

3Dimagination Fermi Ave Didcot Oxon England;

Univ Manchester Sch Mat Manchester Xray Imaging Facil Oxford Rd Manchester M13 9PL Lancs England;

Univ Manchester Sch Earth &

Environm Sci Oxford Rd Manchester M13 9PL Lancs England;

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1. Variability in spatial distribution of mineral phases in the Lower Bowland Shale, UK, from the mm- to mu m-scale: Quantitative characterization and modelling [J] . Fauchille A. L., van den Eijnden A. P., Ma L., Marine and Petroleum Geology . 2018,第期

机译：从MM-to Mu M级从MM-to Mu M级中矿物阶段空间分布的变异性：定量表征和建模
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Variability in spatial distribution of mineral phases in the Lower Bowland Shale, UK, from the mm- to mu m-scale: Quantitative characterization and modelling

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