Quantification of sub-resolution porosity in carbonate rocks by applying high-salinity contrast brine using X-ray microtomography differential imaging
Quantification of sub-resolution porosity in carbonate rocks by applying high-salinity contrast brine using X-ray microtomography differential imaging
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DOI：
10.1016/j.advwatres.2016.08.002
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发表时间：
2016-10-01
影响因子：
4.7
通讯作者：
Bijeljic, Branko
中科院分区：
文献类型：
--
作者：
Lin, Qingyang;Al-Khulaifi, Yousef;Bijeljic, Branko
碳酸盐岩储层和含水层孔隙空间的表征在提高石油采收率、地质碳储存和污染物迁移等许多应用中至关重要。我们提出了一种新的实验方法，该方法使用高盐度对比盐水和 X 射线断层扫描获取的差分成像，以非侵入性方式获得有关波特兰和埃斯塔亚德斯石灰岩这两个岩石样本的孔隙度和连通性的三维空间分辨信息，包括亚分辨率微孔隙度。我们证明，通过注入 30 wt% KI 盐水溶液，可以获得足够高的相差，从而允许基于微分成像的精确三相分割。这产生了固体颗粒相、颗粒内的亚分辨率微孔和大孔的空间分辨图。两个碳酸盐岩样品的三相分割的总孔隙度值与氦孔隙度测量结果非常一致。此外，我们基于流动的方法可以准确估计孔隙连通性和亚分辨率孔隙内的孔隙率分布。 (C) 2016 年作者。由爱思唯尔有限公司出版
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.