泥岩裂隙的正演模拟方法研究
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摘要
由于地震波波长远大于泥岩裂隙的尺度,因此只用Hudson散射理论建立泥岩裂隙的正演模型是不合适 的。根据Schoenberg的线性滑动理论、Hudson理论和HTI各向异性介质理论,将每条泥岩裂隙宏观上看作地 层中的一个柔性面,并用法向柔量和切向柔量来表示,柔量符合线性滑动边界条件,不同方向裂隙的切向柔量和 法向柔量可以进行矢量叠加。依据法向柔量和切向柔量与地层层速度的关系,讨论了利用线性滑动理论和 Hudson裂隙理论对泥岩裂隙进行描述的正演模拟问题,并对若干简单模型进行了计算,用成像测井资料对该模 型进行了验证。结果表明,用Schoenberg线性滑动理论和Hudson理论相结合建立起来的泥岩裂隙模型是正确 的。
For seismic wavelength are more larger than the size of sandstone fractures and seismic wavelength are 100 to 10000 times larger than mudstone fracture, the method that only using Hudson dispersion theory to set up mud-stone fracture forward model might be not appropriate. According to linear slippery theory, Hudson theory and HTI anisotropy theory, each mudstone fracture can be considered as a flexible plane, which can be expressed by normal flexible component and tangential flexible component. Flexible components fit the boundary conditions of linear slippery theory, and normal and tangential flexible components of different directional fractures had been iterated. According to the relationship of normal and tangential flexible components with formation interval velocity, we have discussed the forward modeling issues of describing mudstone fractures used by linear slippery theory and Hudson frac- ture theory, and have calculated some simple models, finally we have verified the models by imaging logging data. The results show that the models set up by combining Schoenberg linear slippery theory with Hudson theory are correct.
For seismic wavelength are more larger than the size of sandstone fractures and seismic wavelength are 100 to 10000 times larger than mudstone fracture, the method that only using Hudson dispersion theory to set up mud-stone fracture forward model might be not appropriate. According to linear slippery theory, Hudson theory and HTI anisotropy theory, each mudstone fracture can be considered as a flexible plane, which can be expressed by normal flexible component and tangential flexible component. Flexible components fit the boundary conditions of linear slippery theory, and normal and tangential flexible components of different directional fractures had been iterated. According to the relationship of normal and tangential flexible components with formation interval velocity, we have discussed the forward modeling issues of describing mudstone fractures used by linear slippery theory and Hudson frac- ture theory, and have calculated some simple models, finally we have verified the models by imaging logging data. The results show that the models set up by combining Schoenberg linear slippery theory with Hudson theory are correct.
引文
1何樵登,张中杰.横向各向同性介质中地震波及其数值 模拟[M].吉林长春:吉林大学出版社,1996.232
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3 Bakulin A, Grechka V, Tsvankin L. Estimation of fracture parameters from reflection seismic data - Part Ⅱ: Fractured models with orthorhombic symmetry [J]. Geophysics, 2000, 65(6) :1 803-1 817
4 Bakulin A, Grechka V, Tsvankin L. Estimation of fracture parameters from reflection seismic data-Part Ⅲ: Fractured models with monoclinic symmetry[J]. Geophysics, 2000, 65(6) :1818-1830
5周辉,何樵登.横向各向同性介质走时反演[J].石油物 探,1995,34(3):46～50
6范国章,牟永光.裂隙各向异性介质中纵波速度的变化 及其对共中心点道集叠加的影响[J].石油物探,2002, 41(1):49～55
7 Thomsen L. Weak elastic anisotropy[J]. Geophysics, 1986,51(10):1954-1966
2 Bakulin A, Grechka V, Tsvankin L. Estimation of fracture parameters from reflection seismic data - Part I : HTI model due to a single fracture set[J]. Geophysics,2000, 65(6): 1788-1 802
3 Bakulin A, Grechka V, Tsvankin L. Estimation of fracture parameters from reflection seismic data - Part Ⅱ: Fractured models with orthorhombic symmetry [J]. Geophysics, 2000, 65(6) :1 803-1 817
4 Bakulin A, Grechka V, Tsvankin L. Estimation of fracture parameters from reflection seismic data-Part Ⅲ: Fractured models with monoclinic symmetry[J]. Geophysics, 2000, 65(6) :1818-1830
5周辉,何樵登.横向各向同性介质走时反演[J].石油物 探,1995,34(3):46～50
6范国章,牟永光.裂隙各向异性介质中纵波速度的变化 及其对共中心点道集叠加的影响[J].石油物探,2002, 41(1):49～55
7 Thomsen L. Weak elastic anisotropy[J]. Geophysics, 1986,51(10):1954-1966
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