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泥质砂岩在干燥与饱和流体状态下纵波速度之间的关系 被引量:1

Corrections between the saturated and dry P-wave velocity of argillaceous sandstone
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摘要 岩石从干燥状态下到饱和流体后纵波速度的变化情况对于地震速度预测、AVO分析以及流体识别具有重要意义,而有关泥质砂岩在干燥与饱和流体状态下纵波速度之间关系的研究甚少.因此本文利用三组实验数据研究了泥质砂岩在干燥与饱和流体状态下纵波速度之间关系的影响因素,并通过多元线性回归分析方法建立泥质砂岩饱和流体后的纵波速度与干燥状态下的纵波速度、孔隙度以及黏土含量之间的关系.研究表明:泥质砂岩在干燥与饱和流体状态下纵波速度之间的简单线性关系容易受到固结程度、孔隙流体性质以及围压的影响,而多元线性回归分析与简单线性分析相比,其拟合结果的判定系数明显提高,标准误差明显减小.此外,本文首次提出黏土含量与孔隙度比的概念(CPR),发现CPR与泥质砂岩饱和流体前后纵波速度差之间有很好的正相关性,随着CPR的增加,纵波速度差也表现出增大的趋势,CPR的提出为解释流体替换过程中岩石物理属性的变化情况提供了新的思路. Rocks from the dry state to saturated fluid changes in Pwave velocity is important for seismic velocity prediction,AVO analysis and reservoir fluid identification.However,few studies have looked into the corrections between the saturated and dry Pwave velocity of argillaceous sandstone,to fill this gap,in this study three sets of data were studied by simple linear regression and multiple regression analysis.Studies have shown that the corrections between the saturated and dry P-wave velocity of argillaceous sandstone is easily affected by consolidation degree,pore fluid property and confining pressure,and the correlation coefficient obtained by multiple regression is higher than that of simple linear regression,the standard error is obviously reduced.In addition,there is a good correlation between the P-wave velocity difference of the argillaceous sandstone and the Clay Porosity Ratio(CPR).With the increase of CPR,the P-wave velocity difference also showed an increasing trend.Therefore,CPR provides a new way to explain the change of petrophysical properties of rock in the process of fluid substitution.
出处 《地球物理学进展》 CSCD 北大核心 2017年第4期1574-1583,共10页 Progress in Geophysics
基金 国家科技重大专项(2016ZX05007-006) 国家自然科学基金(41474112)联合资助
关键词 泥质砂岩 纵波速度 回归分析 黏土含量与孔隙度比 argillaceous sandstone P-wave velocity regression analysis clay porosity ratio
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