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首页> 外文期刊>Petrophysics: The SPWLA Journal of Formation Evaluation and Reservoir Description >Practical Advances in Core-Based Water Saturation Analysis of Shaly Tight Gas Sands
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Practical Advances in Core-Based Water Saturation Analysis of Shaly Tight Gas Sands

机译：泥质致密气砂岩芯饱和水饱和度分析的实用进展

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摘要

New core analysis methods are presented for R_w, formation water resistivity, and Q_v, cation exchange capacity per unit pore volume. Accurate R_w values are needed for all resistivity-based water saturation models. Representative values of the rock property Q_v are necessary for Q_v-based shaly sand models such as Waxman-Smits-Thomas and Dual-Water. Traditional core analysis methods for R_w and Q_v in shaly tight gas sands are limited and tend to be inaccurate or impractical due to the clay-bound water, extensive cementation, and very low permeability that characterize these formations. The new methods address the influence of clay-bound water on results and include its quantification by nuclear magnetic resonance techniques. They are designed to overcome the limitations and inaccuracies of the traditional methods, particularly with respect to tight gas sands, and result in practical approaches for R_w and Q_v. Additionally, an improved and unifying equation is presented for the shaly sand parameter B, the counter-ion conductance term found in the Waxman-Smits-Thomas model. Effective use of this model includes application of representative B values for both the laboratory and reservoir environments. Standard sources of B for each environment are identified and standard values arc compared to those provided from published equations. The poor and biased comparisons lead to development of a single equation with results that compare more favorably with the reservoir-environment standard and exactly with the laboratory-environment standard.
机译：提出了新的岩心分析方法，用于R_w，地层水电阻率和Q_v，每单位孔体积的阳离子交换容量。所有基于电阻率的水饱和度模型都需要准确的R_w值。对于基于Q_v的页岩砂模型（例如Waxman-Smits-Thomas和Dual-Water），岩石属性Q_v的代表值是必需的。对于泥质致密气砂，R_w和Q_v的传统岩心分析方法是有限的，并且由于黏土结合水，广泛的胶结作用和非常低的渗透性（这些特征是特征）而往往不准确或不切实际。新方法解决了黏土结合水对结果的影响，包括通过核磁共振技术对其定量。设计它们的目的是克服传统方法的局限性和不准确性，尤其是在致密气砂方面，并提出了R_w和Q_v的实用方法。此外，针对页岩砂参数B（在Waxman-Smits-Thomas模型中发现的抗衡离子电导项），提出了一个改进的统一方程。有效使用此模型包括在实验室和水库环境中应用代表性的B值。确定每种环境中B的标准来源，并将标准值与已发布的方程式提供的标准值进行比较。较差且有偏颇的比较导致开发了一个方程式，其结果与储层环境标准以及实验室环境标准相比更有利。

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