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Digital core approach to the effects of clay on the electrical properties of saturated rocks using lattice gas automation

机译:利用晶格气自动化技术,数字核心方法研究粘土对饱和岩石电学性质的影响

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摘要

Clay has a significant influence on the relationship between resistivity index I and water saturation Sw (i.e, I-Sw relationship) of reservoir rocks because it complicates the current paths of these rocks. It is difficult to reveal the physical mechanisms of these clay effects on the conductivities of various rocks by physical laboratory measurements because the pore structure, micro distribution and content of clay inside a rock can not be observed and controlled during the experiments. We present a digital rock approach to study these clay effects on the electrical transport properties of reservoir rocks at pore scale using lattice gas automation (LGA) method. The digital rock samples are constructed with the information of grain size distribution from SEM images of reservoir rocks. The LGA is then applied on these digital rocks fully saturated with fluids to simulate the electrical transport properties for revealing the effects of volume and distribution patterns of clay on the non-Archie behaviors of the I-Sw relationship. The very good agreement between the simulated results and the laboratory measurements clearly demonstrates the validity of the LGA in numerical research of rock physics. Based on these studies, a new model has been developed for quantitatively describing the relationship between the saturation exponent and the volume of clay (V sh ). This development may improve the evaluation for the fluid saturations in reservoir rocks.
机译:粘土对储层岩石的电阻率指数I与含水饱和度Sw之间的关系(即I-Sw关系)具有重要影响,因为它使这些岩石的电流路径变得复杂。通过物理实验室测量很难揭示这些粘土作用对各种岩石电导率的物理机理,因为在实验过程中无法观察和控制岩石内部的孔隙结构,微观分布和粘土含量。我们提出了一种数字岩石方法,以利用格化气体自动化(LGA)方法研究这些粘土对孔隙尺度下储层岩石电输运性质的影响。利用储层岩石SEM图像中的粒度分布信息构造数字岩石样品。然后将LGA应用于完全充满流体的这些数字岩石上,以模拟电输运特性,以揭示粘土的体积和分布模式对I-Sw关系的非Archie行为的影响。模拟结果与实验室测量值之间的很好一致性清楚地证明了LGA在岩石物理数值研究中的有效性。基于这些研究,开发了一种新模型,用于定量描述饱和指数与黏土体积(V sh )之间的关系。这一发展可能会改善对储层岩石中流体饱和度的评估。

著录项

  • 来源
    《Applied Geophysics》 |2011年第1期|p.11-17|共7页
  • 作者单位

    State Key Laboratory of Petroleum Resource and Prospecting, Key Laboratory of Earth Prospecting and Information Technology, CNPC Key Lab of Well Logging, China University of Petroleum, Beijing, 102249, China;

    State Key Laboratory of Petroleum Resource and Prospecting, Key Laboratory of Earth Prospecting and Information Technology, CNPC Key Lab of Well Logging, China University of Petroleum, Beijing, 102249, China;

    Bohai Drilling Engineering Company LTD Logging Company, Tianjin, 300280, China;

    PetroChina GWDC Drilling Technology Services Company, Panjin, 124010, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lattice gas automation; Digital rock; non-Archie behavior of I-Sw relationship; clay content;

    机译:格子气自动化;数字岩石;I-Sw关系的非Archie行为;粘土含量;

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