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@article{Ma:2021:10.1039/d0ee03651j,
author = {Ma, L and Fauchille, A-L and Ansari, H and Chandler, M and Ashby, PD and Taylor, KG and Pini, R and Lee, PD},
doi = {10.1039/d0ee03651j},
journal = {Energy and Environmental Science},
pages = {4481--4498},
title = {Linking multi-scale 3D microstructure to potential enhanced natural gas recovery and subsurface CO2 storage for Bowland Shale, UK},
url = {http://dx.doi.org/10.1039/d0ee03651j},
volume = {14},
year = {2021}
}

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TY  - JOUR
AB  - Injection of CO2 into shale reservoirs to enhance gas recovery and simultaneously sequester greenhouse gases is a potential contributor towards the carbon-neutral target. It offers a low-carbon, low-cost, low-waste and large-scale solution during energy transition period. A precondition to efficient gas storage and flow is a sound understanding of how the shale’s micro-scale impacts on these phenomena. However, the heterogeneous and complex nature of shales limits the understanding of microstructure and pore systems, making feasibility analysis challenging. This study qualitatively and quantitatively investigates the Bowland shale microstructure in 3D at five length scales: artificial fractures at 10-100 µm scale, matrix fabric at 1-10 µm-scale, individual mineral grains and organic matter particles at 100 nm- 1 µm scale, macropores and micro-cracks at 10-100 nm scale and organic matter and mineral pores at 1-10 nm-scale. For each feature, the volume fraction variations along the bedding normal orientation, the fractal dimensions and the degrees of anisotropy were analysed at all corresponding scales for a multi-scale heterogeneity analysis. The results are combined with other bulk laboratory measurements, including supercritical CO2 and CH4 adsorption at reservoir conditions, pressure-dependent permeability and nitrogen adsorption pore size distribution, to perform a comprehensive analysis on the storage space and flow pathways. A cross-scale pore size distribution, ranging from 2 nm to 3 µm, was calculated with quantified microstructure. The cumulative porosity is calculated to be 8%. The cumulative surface area is 17.6 m2/g. A model of CH4 and CO2 flow pathways and storage with quantified microstructure is presented and discussed. The feasibility of simultaneously enhanced gas recovery and subsurface CO2 storage in Bowland shale, the largest shale gas potential formation in the UK, was assessed based using multi-scale microstructure
AU  - Ma,L
AU  - Fauchille,A-L
AU  - Ansari,H
AU  - Chandler,M
AU  - Ashby,PD
AU  - Taylor,KG
AU  - Pini,R
AU  - Lee,PD
DO  - 10.1039/d0ee03651j
EP  - 4498
PY  - 2021///
SN  - 1754-5692
SP  - 4481
TI  - Linking multi-scale 3D microstructure to potential enhanced natural gas recovery and subsurface CO2 storage for Bowland Shale, UK
T2  - Energy and Environmental Science
UR  - http://dx.doi.org/10.1039/d0ee03651j
UR  - https://pubs.rsc.org/en/Content/ArticleLanding/2021/EE/D0EE03651J#!divAbstract
UR  - http://hdl.handle.net/10044/1/89753
VL  - 14
ER  -

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