Crosshole seismic tomography with cross-firing geometry

Crosshole seismic tomography with cross-firing geometry
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具有交叉发射几何结构的跨孔地震层析成像

DOI:
10.1190/geo2015-0677.1
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发表时间:
2016-05
期刊:
影响因子:
3.3
通讯作者:
Wang JM
Wang JM
中科院分区:
地球科学2区
文献类型:
--
作者:
Rao Ying;Wang Yanghua;Chen SM;Wang JM

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摘要本文介绍了一个井间地震层析成像的实例研究,其中震源交替放置在两个垂直钻孔中,接收器阵列放置在另一个垂直钻孔中。常规意义上的井间地震数据集有两种。这两个数据集在地震层析成像中联合使用。由于当地沉积物以周期性的、平坦的薄层为主,因此在垂直和水平方向上存在不同速度的地震各向异性。反演过程中考虑了垂向横观各向同性各向异性的影响。首先,各向同性走时层析成像用于估计最大水平速度。然后,利用各向异性走时层析成像方法反演各向异性参数,即最大水平速度与最大垂直速度的归一化差值。最后实现了各向异性波形层析成像。
ABSTRACTWe have developed a case study of crosshole seismic tomography with a cross-firing geometry in which seismic sources were placed in two vertical boreholes alternatingly and receiver arrays were placed in another vertical borehole. There are two crosshole seismic data sets in a conventional sense. These two data sets are used jointly in seismic tomography. Because the local sediment is dominated by periodic, flat, thin layers, there is seismic anisotropy with different velocities in the vertical and horizontal directions. The vertical transverse isotropy anisotropic effect is taken into account in inversion processing, which consists of three stages in sequence. First, isotropic traveltime tomography is used for estimating the maximum horizontal velocity. Then, anisotropic traveltime tomography is used to invert for the anisotropic parameter, which is the normalized difference between the maximum horizontal velocity and the maximum vertical velocity. Finally, anisotropic waveform tomography is impl...
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