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Mineral precipitation in fractures and nanopores within shale Imaged using time-lapse X-ray tomography

DOI: 10.3390/min9080480 DOI Help

Authors: Jose R. A. Godinho (Helmholtz Institute Freiberg for Resource Technology; The University of Mancheste) , Lin Ma (The University of Manchester) , Yuan Chai (The University of Manchester) , Malte Storm (Diamond Light Source) , Timothy L. Burnett (The University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Minerals , VOL 9

State: Published (Approved)
Published: August 2019
Diamond Proposal Number(s): 17314

Open Access Open Access

Abstract: Barite precipitation in fractures and nanopores within a shale sample is analysed in situ, in 3D, and over time. Diffusion of barium and sulphate from opposite sides of the sample creates a supersaturated zone where barium sulphate crystals precipitate. Time-lapse synchrotron-based computed tomography was used to track the growth of precipitates over time, even within the shale’s matrix where the nanopores are much smaller than the resolution of the technique. We observed that the kinetics of precipitation is limited by the type and size of the confinement where crystals are growing, i.e., nanopores and fractures. This has a major impact on the ion transport at the growth front, which determines the extent of precipitation within wider fractures (fast and localised precipitation), thinner fractures (non-localised and slowing precipitation) and nanopores (precipitation spread as a front moving at an approximately constant velocity of 10 ± 3 µm/h). A general sequence of events during precipitation in rocks containing pores and fractures of different sizes is proposed and its possible implications to earth sciences and subsurface engineering, e.g., fracking and mineral sequestration, are discussed.

Journal Keywords: time-lapse imaging; 3D imaging; shale; barite; mineral precipitation; scale; formation damage; porous media; fracking

Subject Areas: Earth Science


Instruments: I13-2-Diamond Manchester Imaging

Documents:
minerals-09-00480-v2.pdf