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火山岩、风化壳白云岩等缝洞储层基质孔隙度计算是测井评价亟需解决的难题之一。本文首先将全直径流纹岩声波实验公式(2005年,李宁)与国内外常用的基质孔隙度计算公式进行了细致的对比;进而就该公式在中基性火山岩、风化壳白云岩等缝洞储层中的适用性进行了深入讨论,并以岩心分析资料为基础,详细给出了该公式与其它公式在计算上述储层基质孔隙度时的误差分布。误差统计结果表明该公式具有更高的精度。通过中国东部和西部三家油田70口井的实际应用验证,在孔隙度从1.5%到15%范围内,该公式不仅适用于酸性火山岩储层,而且适用于中基性火山岩、风化壳白云岩等缝洞储层基质孔隙度的评价。同时,该公式能够最大限度地减小扩径、岩石蚀变等复杂地质条件对计算结果的影响,实用性更强。
Volcanic rocks, weathering crust dolostones and other fracture-cave matrix porosity calculation is one of the problems to be solved urgently. In this paper, firstly, the full rhyolite rhyme experiment formula (Li Ning in 2005) is compared with the commonly used matrix porosity calculation formula both at home and abroad. Then, The applicability of the reservoir is discussed in depth. Based on the core analysis data, the error distribution of this formula and other formulas in calculating the porosity of the above reservoir matrix is given in detail. Error statistics show that the formula has higher accuracy. Through the practical application of 70 wells in three oil fields in eastern and western China, the formula is not only suitable for acidic volcanic reservoirs but also for medium-base volcanic rocks and weathered crust dolomites within the porosity range from 1.5% to 15% Evaluation of matrix porosity in fractured cave. At the same time, the formula can minimize the influence of complex geological conditions such as expanding diameter and rock alteration on the calculation results, and is more practical.