Отправлено: 29.10.10 09:35. Заголовок: Matrix porosity calculation in volcanic and dolomite reservoirs and its application

Applied Geophysics
Volume 6, Number 3, 287-298, DOI: 10.1007/s11770-009-0030-1

Technical Papers
Matrix porosity calculation in volcanic and dolomite reservoirs and its application

Ning Li, Hongliang Wu, Qingfu Feng, Kewen Wang, Yujiang Shi, Qingfeng Li and Xinping Luo


Abstract
Matrix porosity calculations of fractured and vuggy reservoirs, such as volcanics and weathered dolomite, are one of the problems urgently needed to solve in well-log evaluation. In this paper, we first compare the an empirical formula for porosity calculation from full diameter rhyolite core experiments with the matrix porosity formulas commonly used. We discuss the applicability of the empirical formula in fractured and vuggy reservoirs, such as intermediate-basic volcanics and weathered dolomite. Based on core analysis data, the error distribution of the calculated porosity of our empirical formula and the other porosity formulas in these reservoirs are given. The statistical error analysis indicates that the our empirical formula provides a higher precision than the other porosity formulas. When the porosity is between 1.5% and 15%, the acoustic experiment formula can be used not only for acidic volcanics but also in other fractured and vuggy reservoirs, such as intermediate-basic volcanics and weathered dolomite. Moreover, the formula can reduce the effects of borehole enlargement and rock alteration on porosity computation.

Keywords porosity - acoustic slowness - volcanics - carbonates
This research was sponsored by the Science Research and Technology Development Project of Petrochina Company Limited “Well Logging Interpretation and Integrative Evaluation of the Complex Lithology”(Grant No.2008A-2705).
Li Ning, see biography and photo in APPLIED GEOPHYSICS December 2004 issue, p, 129.


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