摘要
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.
矩阵孔计算断裂并且 vuggy 水库例如 volcanics 和捱过的白云石，是着急地需要在记载得好的评估解决的问题之一。在这篇论文，我们首先比较为从有矩阵孔公式的完整的直径流纹岩核心实验的孔计算的一个实验公式通常使用了。我们讨论实验公式的适用性在断裂并且 vuggy 水库，例如中介基本的 volcanics 和捱过的白云石。基于核心分析数据，我们的实验公式的计算的孔的错误分发和在这些水库的公式被给的另外的孔。统计错误分析显示我们的实验公式比另外的孔公式提供更高的精确。当孔在 1.5% 和 15% 之间时，声学的实验公式能不仅为酸的 volcanics 而且在折断的其它和 vuggy 水库被使用，例如中介基本的 volcanics 并且捱过白云石。而且，公式能在孔计算上减少地上凿穿增大和岩石改变的效果。
基金
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)
