Target-oriented curved-wave prestack depth migration by controlled illumination

Target-oriented curved-wave prestack depth migration by controlled illumination
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受控照明的目标导向弯曲波叠前深度偏移

DOI:
10.1190/1.3137018
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发表时间:
2009-06
期刊:
影响因子:
3.3
通讯作者:
Ma, Zaitian
Ma, Zaitian
中科院分区:
地球科学2区
文献类型:
--
作者:
Chen, Xiumei;Nie, Guohua;Wang, Huazhong;Ma, Zaitian

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传统的叠前深度偏移是基于全叠前数据进行的,需要进行大量的波场外推计算。面炮记录技术是一种有效的PSDM方法,因为它的合成过程大大减少了偏移所需的叠前数据量。构造其合成算子是影响面炮偏移记录成像质量的关键。弯曲波PSDM技术扩展了平面炮点偏移。它通过定义一个复变函数作为弯曲波场的基核乘以与射线参数相关的光照扰动因子来构造合成算子,然后合成用于偏移的弯曲波场。基于弯曲波偏移理论,提出了一种高效、精确的弯曲波可控照明偏移方法。我们利用波动理论,结合基核照明方向的旋转或扰动,构造了面向目标的综合算子。
Conventional prestack depth migration (PSDM) based on full prestack data involves many computations for wavefield extrapolation. Areal shot-record technology offers an attractive alternative for efficient PSDM because its synthesis process greatly decreases the amount of prestack data required for migration. Constructing its synthesis operator is key to the image quality of the migrated areal shot record. Curved-wave PSDM technology expands areal shot-record migration. It constructs synthesis operators by defining a complex function as a base kernel of curved wavefields multiplied by a factor of its illumination perturbation related to ray parameter and then synthesizes curved wavefields for migrations. Based on curved-wave-migration theory, we propose an efficient and accurate curved-wave, controlled-illumination method to migrate in a target-oriented way. We construct tar-get-oriented synthesis operators by wave theory, combined with rotation or perturbation of the illuminating direction of a base-kerne...
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