计算物理 ›› 2010, Vol. 27 ›› Issue (3): 413-422.

• 研究论文 • 上一篇    下一篇

孔隙度数值反演计算

刘福平1,2, 曹跃祖1, 王安玲1, 杨长春2   

  1. 1. 北京印刷学院, 北京 102600;
    2. 中国科学院地质与地球物理研究所, 北京 100029
  • 收稿日期:2009-03-23 修回日期:2009-07-07 出版日期:2010-05-25 发布日期:2010-05-25
  • 作者简介:刘福平(1960-),男,山东莒县,教授,博士,主要从事油藏数值模拟、电磁测井理论及数值计算方面的研究和教学工作,北京印刷学院等离子体研究室102600.
  • 基金资助:
    北京市自然基金(1083011);北京市属市管高等学校人才强教计划资助项目

Numerical Inversion of Porosity

LIU Fuping1,2, CAO Yuezu1, WANG Anling1, YANG Changchun2   

  1. 1. Beijing Institute of Graphic Communication, Beijing 102600, China;
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2009-03-23 Revised:2009-07-07 Online:2010-05-25 Published:2010-05-25

摘要: 由渗流微分方程定解问题和Peaceman方程给出了网格压力、井底压力对网格孔隙度的导数,利用三维渗流方程压强数值解计算井底压力对网格孔隙度的导数;采用共轭梯度法实现孔隙度均匀(或分块均匀)分布油藏模型的反演计算.算例表明,经过8~10次迭代后反演结果与真值的最大相对误差在0.03%以内,反演收敛于真值.

关键词: 孔隙度反演, 数值计算, 最优化, 敏感系数, 收敛性

Abstract: Derivatives of well-bore and grid-block pressure to grid porosity are derived from initial boundary value problems of fluid equations in porous media and inner boundary condition.The derivatives are computed with numerical solution of 3D fluid equation in porous media.A inverse iterative equation is constructed by conjugate method.Numerical inversion of porosity distribution are realized for uniform or block uniform distribution reservoirs.It shows that the relative error of inverse porosity is less than three ten thousandths for a homogenous porosity reservoir with about 8-10 iterations.Relative error of inverse porosity is less than one thousandth for a block homogenous porosity reservoir.Computed porosity automatically approachs to the real value in a few iterations.

Key words: porosity inversion, numerical calculation, optimization, sensitivity coefficients, convergent property

中图分类号: