An approach for velocity determination from merging Archie and Raymer-Hunt-Gardner transform in reservoir of clean nature

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• 作者：Karter H. Makar ; ^{khm_abed@yahoo.com} ; Mostafa H. Kamel
• 关键词：Archie&ndash ; Raymer relationship ; compressional velocity ; shear velocity ; resistivity&ndash ; velocity relationship ; quick-look approach
• 刊名：Journal of Petroleum Science and Engineering
• 出版年：2012
• 期刊代码：33_09204105
• 类别：pw
• 出版时间：May, 2012
• 卷：86-87
• 期：Complete
• 页码：297-301
• 文件大小：242 K

摘要

This paper introduces an empirical equation to approximately quantify the P-wave velocity especially in the absence of many logs and core usually used instantaneously to evaluate such parameter. Further, using the proposed equation with the help of Poisson's ratio, the S-wave velocity can be easily evaluated.

The proposed equation is based mainly on merging the well-known Archie equation (1942) with the Raymer-Hunt-Gardner equation (1980). This equation takes into account the effects of both matrix and fluid transit times (螖_tma, 螖_tf - with known type of lithology; sandstone, limestone and/or dolomite) as well as the formation water resistivity (R_W), resistivity of fully saturated (R₀), formation factor coefficients in terms of tortuosity factor (a), and cementation exponent (m). Further mathematical treatment for finding the V_P/V_S ratio from Anderson et al. (1973) of Poisson's ratio, the S-wave velocity could then be estimated.

Comparison is made and agreement within an error not exceeding 卤 4 between predicted and actual values is reached. Successfulness of applying the proposed approach is restricted with the accuracy of finding R_W and good selection of R₀.

Field examples from USA and the Gulf of Suez Basin of Egypt are illustrated to indicate the potentiality and validity of the suggested approach.