3D diffraction imaging with Kirchhoff time migration using vertical traveltime difference gathers
3D diffraction imaging with Kirchhoff time migration using vertical traveltime difference gathers
复制标题
使用垂直走时差道集进行基尔霍夫时间偏移的 3D 衍射成像
DOI:
10.1190/geo2018-0630.1
复制
发表时间:
2019-11
期刊:
影响因子:
3.3
通讯作者:
Jianfeng Zhang
中科院分区:
文献类型:
--
作者:
Zhengwei Li;Jianfeng Zhang
We have built a vertical traveltime difference (VTD) gather to image diffractions in the 3D time domain. This significantly improves detection of small-scale faults and heterogeneities in 3D seismic data. The VTD gather is obtained using 3D Kirchhoff prestack time migration based on the traveltime-related inline and crossline dip angles, which is closely related to the 2D dip-angle gather. In VTD gathers, diffraction events exhibit flattening, whereas reflection events have convex upward-sloping shapes. Different from the 2D dip-angle gather, Fresnel zone-related specular reflections are precisely focused on the given regions over all offsets and azimuths, thus leaving more diffraction energy after muting. To image linear diffractors, such as faults in three dimensions, the VTD gather can be extended into two dimensions by adding a dip-azimuth dimension. This makes it possible to correct phases of edge diffractions and detect the orientations of the linear diffractors. The memory requirement of the VTD or VTD plus azimuth gathers is much less than that of the 2D dip-angle gathers. We can store the gathers at each lateral position and then correct the phase and enhance the weak diffractions in 3D cases. Synthetic and field data tests demonstrate the effectiveness of our 3D diffraction imaging method.
登录
查看更多内容
DOI:
10.1007/bf02846778
发表时间:
1991-12
期刊:
Pramana
影响因子:
--
作者:
P. B. S. Kumar;G. Ranganath
通讯作者:
P. B. S. Kumar;G. Ranganath
DOI:
10.1049/pbew037e
发表时间:
1994-06
期刊:
--
影响因子:
--
作者:
V. Borovikov;B. Kinber
通讯作者:
V. Borovikov;B. Kinber
影响因子:
2.6
作者:
Faisal Alonaizi;R. Pevzner;A. Bona;V. Shulakova;B. Gurevich
通讯作者:
Faisal Alonaizi;R. Pevzner;A. Bona;V. Shulakova;B. Gurevich
DOI:
10.1190/1.9781560802617
发表时间:
1994
期刊:
--
影响因子:
--
作者:
K. Klem-Musatov;F. Hron;L. Lines
通讯作者:
K. Klem-Musatov;F. Hron;L. Lines
影响因子:
3.3
作者:
Xiaosan Zhu;R. Wu
通讯作者:
Xiaosan Zhu;R. Wu