期刊
ADVANCES IN WATER RESOURCES
卷 96, 期 -, 页码 306-322出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2016.08.002
关键词
Carbonate; X-ray microtomography; Sub-resolution porosity; Micro-porosity; Differential imaging
资金
- DEA Deutsche Erdoel AG
- Engineering and Physical Science Research Council [EP/L012227/1]
- EPSRC [EP/L012227/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L012227/1] Funding Source: researchfish
Characterisation of the pore space in carbonate reservoirs and aquifers is of utmost importance in a number of applications such as enhanced oil recovery, geological carbon storage and contaminant transport. We present a new experimental methodology that uses high-salinity contrast brine and differential imaging acquired by X-ray tomography to non-invasively obtain three-dimensional spatially resolved information on porosity and connectivity of two rock samples, Portland and Estaillades limestones, including sub resolution micro-porosity. We demonstrate that by injecting 30 wt% KI brine solution, a sufficiently high phase contrast can be achieved allowing accurate three-phase segmentation based on differential imaging. This results in spatially resolved maps of the solid grain phase, sub-resolution micro-pores within the grains, and macro-pores. The total porosity values from the three-phase segmentation for two carbonate rock samples are shown to be in good agreement with Helium porosity measurements. Furthermore, our flow-based method allows for an accurate estimate of pore connectivity and a distribution of porosity within the sub-resolution pores. (C) 2016 The Authors. Published by Elsevier Ltd.
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