S1P/S2P波分离及SVP横波分裂校正

doi:10.13810/j.cnki.issn.1000-7210.2023.06.009

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Abstract For shear（S）-wave source seismic exploration， extracting fracture information from the data and performing fast/slow S-wave separation and S-wave splitting correction are of great significance for S-wave seismic data imaging with azimuthal anisotropy. The difference between SP converted wave （P-wave converted from S-wave） in S-wave source exploration data and PS converted wave （S-wave converted from P-wave） is that the S-wave splitting occurs in the process of downgoing wave or upgoing wave propagation. Therefore， the S-wave splitting characteristics of the SP wave are similar to those of the PS wave. In this paper， the tangent energy minimization method of PS wave is applied to the S-wave splitting analysis of SP wave to find the direction of underground cracks. In the application of 3D nine-component （3D9C） actual data， a technical process is formed based on the preprocessing of SP wave seismic data including common conversion point （CCP） gather extraction and NMO correction， and the corresponding crack direction of CCP is obtained by azimuthal superposition. In addition， the fast and slow converted （S1P and S2P） wave separation is carried out. At the same time， a strategy is proposed to obtain the time difference by picking up the horizon on the fast and slow wave superimposed profile. After the time difference is applied to the S-wave splitting correction， SVP without the S-wave splitting effect is obtained， and the image quality of the profile is improved. The application results of synthetic data and actual data show that the imaging profiles of S1P and S2P waves are significantly improved compared with those before separation， and the SVP reflection energy is improved after S-wave splitting correction， which verifies the feasibility of the proposed method for fast and slow wave separation and S-wave splitting correction in actual SP wave seismic data.

Key words： shear wave splitting fast/slow shear wave separation shear wave source S1P wave S2P wave SVP wave

Received: 01 December 2022

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P631

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	Articles by authors
	YUE Yuanyuan
	QIAN Zhongping
	NIE Hongmei
	SUN Pengyuan
	DENG Zhiwen
	LI Jianfeng

Cite this article:

YUE Yuanyuan,QIAN Zhongping,NIE Hongmei等. S1P/S2P wave separation and shear wave splitting correction for SVP data[J]. OGP, 2023, 58(6): 1374-1381.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.06.009 OR http://www.ogp-cn.com/EN/Y2023/V58/I6/1374

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