Rapid Rock Nanoporosity Analysis Using Small Angle Scattering Fused with Imaging Data Based on Stochastic Reconstructions

M. Karsanina, V. Volkov, P. Konarev, V. Belokhin, I. Bayuk, D. Korost, K. Gerke
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引用次数: 2

Abstract

Through recent decade pore-scale modelling techniques matured enough to establish their robustness for relatively simple porous rocks, in particular porous media with a narrow pore-size distribution within the resolution window of the X-ray microtomography devices. But modelling of flow properties for rocks with significant amount of nano-scale porosity requires additional multi-scale structure studies. Current imaging techniques are too limited or time-consuming to cover necessary volumes of porous media. Thus, we are in search of a fast, yet robust methodology to assess nan-scale pore structure which can be used to inform pore-scale models and improve the accuracy of flow and transport predictions. In this work we report some preliminary results on the usage of the small angle scattering techniques to access the nano-scale structural properties for two complex rocks: chalk and Bazhenov formation siliceous rock (shale). The pore-size interpretation of X-ray small angle scattering results is compared against mercury porosimetry results and scanning electron microscopy. We argue that obtained results show qualitative agreement which provides an alley for future technology to combine small angle scattering with stochastic reconstructions. To further elucidate the power of such approach we perform 3D stochastic reconstructions based on 2D SEM images and simulate apparent gas permeability using pore-network model accounting for slip and (Knudsen) diffusion effects. Compared to laboratory measurements of gas permeability our results show surprisingly good agreement. We discuss obtained results and future developments of such a novel technology.
基于随机重建的小角散射与成像数据融合的岩石纳米孔隙度快速分析
经过近十年的发展,孔隙尺度建模技术已经足够成熟,可以在相对简单的多孔岩石中建立其鲁棒性,特别是在x射线微层析成像设备的分辨率窗口内具有狭窄孔隙尺寸分布的多孔介质。但是,对具有大量纳米级孔隙度的岩石进行流动特性建模需要额外的多尺度结构研究。目前的成像技术过于有限或耗时,无法覆盖必要体积的多孔介质。因此,我们正在寻找一种快速而稳健的方法来评估纳米尺度的孔隙结构,该方法可用于为孔隙尺度模型提供信息,并提高流动和输送预测的准确性。在这项工作中,我们报告了使用小角散射技术获取两种复杂岩石(白垩和Bazhenov组硅质岩(页岩))纳米级结构特性的一些初步结果。将x射线小角散射结果的孔径解释与汞孔测定结果和扫描电镜结果进行了比较。我们认为所得结果在定性上是一致的,这为未来小角散射与随机重建相结合的技术提供了一条途径。为了进一步阐明这种方法的力量,我们基于二维扫描电镜图像进行了三维随机重建,并使用考虑滑移和(Knudsen)扩散效应的孔隙网络模型模拟表观渗透率。与气体渗透性的实验室测量结果相比,我们的结果显示出惊人的良好一致性。我们讨论了这种新技术的成果和未来的发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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