An Estimation Method of Pore Structure and Mineral Moduli Based on Kuster-Toksöz (KT) Model and Biot’s Coefficient

IF 2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Da Peng, Cheng Yin, Hu Zhao, Wei Liu
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引用次数: 3

Abstract

Pore structure and mineral matrix elastic moduli are indispensable in rock physics models. We propose an estimation method of pore structure and mineral moduli based on Kuster-Toksöz model and Biot’s coefficient. In this technique, pore aspect ratios of five different scales from 100 to 10−4 are considered, Biot’s coefficient is used to determine bounds of mineral moduli, and an estimation procedure combined with simulated annealing (SA) algorithm to handle real logs or laboratory measurements is developed. The proposed method is applied to parameter estimations on 28 sandstone samples, the properties of which have been measured in lab. The water saturated data are used for estimating pore structure and mineral moduli, and the oil saturated data are used for testing these estimated parameters through fluid substitution in Kuster-Toksöz model. We then compare fluid substitution results with lab measurements and find that relative errors of P-wave and S-wave velocities are all less than 5%, which indicates that the estimation results are accurate.
基于Kuster-Toksöz (KT)模型和Biot系数的孔隙结构和矿物模量估算方法
孔隙结构和矿物基质弹性模量在岩石物理模型中是不可缺少的。提出了一种基于Kuster-Toksöz模型和Biot系数的孔隙结构和矿物模量估算方法。在该技术中,考虑了从100到10−4的五种不同尺度的孔隙纵横比,Biot系数用于确定矿物模量的界限,并开发了一种结合模拟退火(SA)算法的估计程序来处理实际日志或实验室测量。将该方法应用于28个砂岩样品的参数估计,并对其进行了室内实测。饱和水数据用于估算孔隙结构和矿物模量,饱和油数据通过Kuster-Toksöz模型流体替换对这些估算参数进行检验。然后将流体替代结果与实验室测量结果进行比较,发现纵波和横波速度的相对误差均小于5%,表明估算结果是准确的。
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来源期刊
Acta Geophysica
Acta Geophysica 地学-地球化学与地球物理
CiteScore
3.90
自引率
13.00%
发文量
251
审稿时长
5.3 months
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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