西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (3): 13-15.DOI: 10.3863/j.issn.1674-5086.2009.03.003

• 地质勘探 • 上一篇    下一篇

双相介质中储层波场特征数值模拟研究

李勇1a,1b 肖富森2 马廷虎2 李义明2 谭勇2   

  1. 1.成都理工大学:a.“地球探测与信息技术”教育部重点实验室,b.信息工程学院,四川 成都 610059;2.中国石油西南油气田分公司川东开发公司,重庆 400021
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-06-20 发布日期:2009-06-20

RESERVOIR WAVE FIELD CHARACTERISTIC NUMERICAL SIMULATION IN TWO-PHASE MEDIA

LI Yong1a,1b XIAO Fu-sen2 MA Ting-hu2 LI Yi-ming2 TAN Yong2   

  1. 1.Chengdu University of Technology:a.Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education,b.College of Information Engineering,Chengdu Sichuan 610059,China;2.Development Company of PetroChina Southwest Oil/gas Field Chuandong,Chongqing 400021,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-06-20 Published:2009-06-20

摘要:

根据双相介质弹性波方程,并对弹性波方程进行分离得到了膨胀波方程。利用高阶差分对膨胀波方程进行数值模拟,边界处理采用完全匹配层的吸收边界条件,算法实现了任意高阶差分和自动加载边界条件的纵波方程正演模拟。计算结果表明,在双相各向同性介质中存在快纵波、慢纵波,两种纵波有明显的区别,快纵波的速度远大于慢纵波的速度。在分界面上,快纵波要产生透射快纵波、透射转换慢纵波,反射快纵波、反射转换慢纵波。慢纵波具有很强的衰减性,耗散系数越小,慢纵波越明显,反之亦然。该算法的高阶差分形式可以显著地降低数值频散,有效提高地震波正演计算的精度,适应性好,操作简便灵活。

关键词: 双相介质, 波动方程, 波场特征, 有限差分, 数值模拟

Abstract:

Based on the equation of elastic wave propagation in two-phase media and by separating the equation of elastic wave,the dilatational wave equation in two-phase in media is derived.The higher finite-difference (FD) and the perfectly matched layer boundary conditions are used to numerical simulation.The numerical simulation of the any higher-order difference and automatic loading boundary conditions is realized.The results of the calculation show that in the two-phase media,there are the fast dilatational wave and slow dilatational wave and they are different obviously.The velocity of the fast P wave is higher.On the interface,incident fast P- wave will generate two kinds of transmission and two kinds of reflection waves.The slow P-wave has intensive attenuation.The dissipation modulus is smaller,then the slow P-wave is more obvious,vice versa.The high-order FD pattern of this method can reduce the numerical dispersion markedly,and improve the accuracy of numerical simulation effectively and with good adaptability.The operation is convenient and flexible.

Key words: two-phase media, wave equation, wave field characteristic, finite difference, numerical simulation

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