研究碳酸盐岩中孔隙几何形状与其他孔隙空间特性之间的分析关系

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
B. Khadem, Mohammad Reza Saberi, Michel Krief, Hossein Rezaei Abbasi
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引用次数: 0

摘要

虽然孔隙几何在碳酸盐岩物理建模中发挥着重要作用,但有关其与孔隙空间刚度等其他孔隙空间特性的分析关系的研究却很少。我们提出了一种基于微分有效介质(DEM)的分析工作流程,用于估算碳酸盐岩的弹性特性。然后,在一个真实的碳酸盐岩数据集上,将我们的结果与 Xu 和 Payne 模型进行交叉检验。这一工作流程在碳酸盐岩的孔隙几何与其他孔隙特性(如比奥特系数和孔隙刚度)之间建立了直接的定量联系。这种关系还可用于定义岩石物理模板(RPT),以研究孔隙几何对岩石弹性特性的影响。此外,我们还通过我们提出的工作流程扩展了 Biot-Gassmann-Krief (BGK) 模型,建立了一个理论框架,将 BGK 模型的主要组成部分与通常在实验室或根据经验估算的孔隙几何形状联系起来。这有助于研究流体替代对每个主要成分的影响。我们的研究表明,Biot 和 Gassmann 系数越高,岩石对流体置换越敏感。此外,我们还利用这一分析工作流程研究了选择不同旋转球面(即扁球面和长球面)对模型速度的作用。我们的结果表明,建模速度取决于这种选择,与扁圆形孔隙相比,扁圆形孔隙对其孔隙长径比的变化不那么敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the analytical relationship between pore geometry and other pore space properties in carbonate rocks
Although pore geometry plays an important role in carbonates rock physics modeling, few studies have been done on its analytic relationship with other pore space properties like pore space stiffness. We propose an analytical workflow based on the differential effective medium (DEM) to estimate the elastic properties of carbonate rocks. Then, the validity of our results is cross-checked with the Xu and Payne model on a real carbonate dataset. This workflow establishes a direct and quantitative link between the pore geometry of carbonate rock with its other pore space properties such as Biot's coefficient and pore space stiffness. This relationship can be, furthermore, utilized in defining rock physics templates (RPTs) to investigate the role of pore geometry on the rock elastic properties. Furthermore, we extended the Biot-Gassmann-Krief (BGK) model through our proposed workflow by establishing a theoretical framework to relate the main components of the BGK model to the pore geometry usually estimated in the laboratory or empirically. This can help to investigate the impact of fluid substitution on each of these main components. Our investigation suggests that the higher the Biot and Gassmann coefficients, the rock is more sensitive to fluid substitution. Moreover, this analytical workflow has been employed to examine the role of selecting different rotational spheroids (i.e., oblate and prolate) on the modeled velocities. Our results show that the modeled velocities depend on this selection in a way that prolate pores are less sensitive to the variations in their pore aspect ratio compared with the oblate pores.
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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