地球物理学进展 ›› 2017, Vol. 32 ›› Issue (4): 1574-1583.doi: 10.6038/pg20170422

• 应用地球物理学Ⅰ • 上一篇    下一篇

泥质砂岩在干燥与饱和流体状态下纵波速度之间的关系

李东庆1,2,3, 魏建新1,2,3, 狄帮让1,2,3, 王贸1,2,3, 张超4   

  1. 1. 中国石油大学(北京)地球物理与信息工程学院, 北京 102249;
    2. 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249;
    3. 中国石油大学(北京)CNPC物探重点实验室, 北京 102249;
    4. 大庆钻探工程公司地球物理勘探一公司, 大庆 163357
  • 收稿日期:2016-12-13 修回日期:2017-05-28 出版日期:2017-08-20 发布日期:2017-08-20
  • 通讯作者: 魏建新,男,1958年生,教授,博导,主要从事地震物理模型研究.(E-mail:weijx@cup.edu.cn) E-mail:weijx@cup.edu.cn
  • 作者简介:李东庆,男,1988年生,博士研究生,从事岩石物理和地震物理模拟方面的研究.(E-mail:lidongqing555@126.com)
  • 基金资助:

    国家科技重大专项(2016ZX05007-006)和国家自然科学基金(41474112)联合资助.

Corrections between the saturated and dry P-wave velocity of argillaceous sandstone

LI Dong-qing1,2,3, WEI Jian-xin1,2,3, DI Bang-rang1,2,3, WANG Mao1,2,3, ZHANG Chao4   

  1. 1. College of Geophysics and Information Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum(Beijing), Beijing 102249, China;
    4. NO.1 Geophysical Exploration Company of Daqing Drilling & Exploration Engineering Company CNPC, Daqing 163357, China
  • Received:2016-12-13 Revised:2017-05-28 Online:2017-08-20 Published:2017-08-20

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.

Abstract:

Rocks from the dry state to saturated fluid changes in P-wave 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 P-wave 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.

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