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

作者：Makar Karter H^*; Kamel Mostafa H

来源：Journal of Petroleum Science and Engineering, 2012, 86-87: 297-301.

DOI：10.1016/j.petrol.2012.03.030

• Archie-Raymer relationship
• compressional velocity
• shear velocity
• resistivity-velocity relationship
• quick-look approach

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%26apos;s ratio, the S-wave velocity can be easily evaluated. %26lt;br%26gt;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 (Delta(tma), Delta(tf) - with known type of lithology; sandstone, limestone and/or dolomite) as well as the formation water resistivity (R-W), resistivity of fully saturated (R-0), 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%26apos;s ratio, the S-wave velocity could then be estimated. %26lt;br%26gt;Comparison is made and agreement within an error not exceeding +/- 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 R-0. %26lt;br%26gt;Field examples from USA and the Gulf of Suez Basin of Egypt are illustrated to indicate the potentiality and validity of the suggested approach.

• 出版日期2012-5