CAJ | 학술논문

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筹分布.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.
화산암、풍화각백운암등봉동저층기질공극도계산시측정평개극수해결적난제지일.본문수선장전직경류문암성파실험공식(2005년,리저)여국내외상용적기질공극도계산공식진행료세치적대비;진이취해공식재중기성화산암、풍화각백운암등봉동저층중적괄용성진행료심입토론,병이암심분석자료위기출,상세급출료해공식여기타공식재계산상술저층기질공극도시적오주분포.오차통계결과표명해공식구유경고적정도.통과중국동부화서부삼가유전70구정적실제응용험증,재공극도종1.5%도15%범위내,해공식불부괄용우산성화산암저층,이차괄용우중기성화산암、풍화각백운암등봉동저층기질공극도적평개.동시,해공식능구최대한도지감소확경、암석식변등복잡지질조건대계산결과적영향,실용성경강.
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 voicanics 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.