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首页> 外文期刊>Arabian Journal for Science and Engineering >A Modified Approach for Volumetric Evaluation of Shaly Sand Formations from ConventionalWell Logs: A Case Study from the Talhar Shale, Pakistan
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A Modified Approach for Volumetric Evaluation of Shaly Sand Formations from ConventionalWell Logs: A Case Study from the Talhar Shale, Pakistan

机译：从常规测井资料评估泥质砂岩地层体积的一种改进方法：以巴基斯坦塔尔页岩为例

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摘要

In potential shale-gas basins, due to limited data availability, volumetric evaluation of shaly sand formations is a challenging task for researchers, as well as for exploration and production companies, with the use of conventional well logs. This paper is intended to provide a better understanding of volumetric evaluation in unconventional shaly sand formations. Petrophysical parameters derived from conventional well logs play a significant role in the volumetric estimation of shale. The assessment was performed using numerical equations, well log indexes, and cross-plot analysis. Deep and shallow resistivity logs overlap with each other; this phenomenon indicates that the Talhar Shale in Pakistan can be considered to be an unconventional formation. The average values of shale volume, total porosity, effective porosity, and matrix volume are 29, 16, 12, and 59%, respectively. The Talhar Shale is dominantly characterized by intergranular porosity. It has been observed that at low shale volumes (10-20%), porosities (total and effective), and resistivity measurements (deep, shallow, and microlaterolog), well log signatures have close contents with the shale volume. In contrast, for the remainder of the shale volume, there is significant separation of log signatures. Well log indexes indicate significant responses in 10-20% shale volume zones.
机译：在潜在的页岩气盆地中，由于数据可用性有限，利用常规测井技术对研究人员以及勘探和生产公司的泥质砂岩地层进行体积评估是一项艰巨的任务。本文旨在提供对非常规泥质砂岩地层体积评估的更好理解。来自常规测井的岩石物理参数在页岩的体积估计中起着重要作用。使用数值方程式，测井指数和交叉图分析进行评估。深层和浅层电阻率测井曲线相互重叠；这种现象表明，巴基斯坦的Talhar页岩可被认为是非常规地层。页岩体积，总孔隙度，有效孔隙度和基质体积的平均值分别为29％，16％，12％和59％。塔哈尔页岩的主要特征是粒间孔隙度。已经观察到，在低页岩量（10％至20％），孔隙率（总有效量）和电阻率测量值（深，浅和微岩层）下，测井曲线特征与页岩量具有密切的关系。相反，在其余的页岩体积中，测井特征明显分离。测井指数表明在10％至20％的页岩量区域有明显的响应。

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