An improved fast converted-wave imaging method

Wu Xiao; Liu Yang; Wang Yong; Xu Shi-Gang; Jia Wan-Li

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An improved fast converted-wave imaging method

机译：一种改进的快速转换波成像方法

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The conventional fast converted-wave imaging method directly uses backward P-and converted S-wavefield to produce joint images. However, this image is accompanied by strong background noises, because the wavefields in all propagation directions contribute to it. Given this issue, we improve the conventional imaging method in the two aspects. First, the amplitude-preserved P- and S-wavefield are obtained by using an improved space-domain wavefield separation scheme to decouple the original elastic wavefield. Second, a converted-wave imaging condition is constructed based on the directional-wavefield separation and only the wavefields propagating in the same directions used for cross-correlation imaging, resulting in effectively eliminating the imaging artifacts of the wavefields with different directions; Complex-wavefield extrapolation is adopted to decompose the decoupled P- and S-wavefield into directional-wavefields during backward propagation, this improves the efficiency of the directional-wavefield separation. Experiments on synthetic data show that the improved method generates more accurate converted-wave images than the conventional one. Moreover, the improved method has application potential in micro-seismic and passive-source exploration due to its source-independent characteristic.

机译：常规的快速转换波成像方法直接使用后向P波和转换S波场来产生联合图像。但是，此图像伴随着强烈的背景噪声，因为所有传播方向上的波场都对其造成了影响。鉴于此问题，我们在两个方面改进了常规成像方法。首先，通过使用改进的空间域波场分离方案来解耦原始弹性波场，获得了保振幅的P和S波场。其次，基于方向波场的分离构造转换波成像条件，并且仅将在相同方向上传播的波场用于互相关成像，从而有效地消除了不同方向的波场的成像伪影;通过复波场外推法将解耦后的P，S波场在反向传播过程中分解为定向波场，提高了定向波场分离的效率。对合成数据进行的实验表明，与传统方法相比，该改进方法可生成更准确的转换波图像。此外，由于其独立于源的特点，该改进方法在微震和被动源勘探中具有应用潜力。

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来源
《应用地球物理（英文版）》 |2019年第2期|171-184|共14页
作者
Wu Xiao; Liu Yang; Wang Yong; Xu Shi-Gang; Jia Wan-Li;
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作者单位

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

Faculty of Petroleum, Karamay Campus of China University of Petroleum (Beijing), Karamay, Xinjiang 834000, China;

CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

Sinopec Geophysical Exploration Institute of Jiangsu Oilfield, Jiangsu, 210046, China;

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;

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An improved fast converted-wave imaging method

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