面向高陡构造的棱柱波地震干涉成像方法

doi:10.11720/wtyht.2025.0138

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Abstract

Conventional migration imaging,which only considers primary reflected waves,fails to effectively image subsurface high-steep geobodies.Compared to primary reflected waves,prismatic waves travel an additional path, enabling the imaging of high-steep structures.However,the additional travel path increases the computational load.Seismic interferometry can shift the surface observation system downward to an artificially selected subsurface calibration plane.Consequently,subsequent calculations only need to be performed on the model below the subsurface calibration plane,there by improving computational efficiency.Hence,this study proposed a novel imaging method integrating prismatic waves and seismic interferometry.In the proposed method,the acoustic wave equation was replaced by the prismatic wave equation.Virtual records were generated through cross-correlations between data from the surface and subsurface reference planes.These records were combined with reverse time migration(RTM) for imaging.The proposed method was verified using the horizontal layered, L-shaped, and salt dome models.Specifically,the horizontal layered model exhibited consistent imaging results with those below the global reference plane;the L-shaped model outperformed conventional methods in imaging steep structures;the salt dome model displayed enhanced pre-salt imaging resolution.Due to the downward shift of the surface observation system,the following imaging process entailed a reduced vertical depth and a shorter shot record time.The proposed method reduced the computational cost to 26.6% of that using the conventional RTM imaging.Overall,through the downward shift of the observation system and the utilization of multiples,the proposed method achieved both satisfactory accuracy and efficiency,overcoming the limitations of traditional interferometry and providing a novel solution for exploring high-steep structures.Notably,there still exist discrepancies between the simplified models and the actual heterogeneity,requiring further optimization of the computational cost.

Key words： seismic interferometry prism waves cross-correlation reverse time migration(RTM) high-steep structures

Received: 24 April 2025 Published: 30 December 2025

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	Articles by authors
	Yu-Chen LUO
	Zhang-Qing LUO
	Sheng LIU
	Cheng-Hua OU
	Ze-Yu WANG
	Chang LIU

Cite this article:

Yu-Chen LUO,Zhang-Qing LUO,Sheng LIU, et al. An imaging method integrating prismatic waves and seismic interferometry for high-steep structures[J]. Geophysical and Geochemical Exploration, 2025, 49(6): 1372-1379.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.0138 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I6/1372

Schematic of the double Green’s function interferometry method based on the cross-correlation principle

Intermediate steps of datum downward shift

Algorithm flow

Two-layer horizontal model

figure 4
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Input shot records under the model in figure 4

Comparison of interference effect shot records of the two-layer horizontal model

Comparison of reverse time migration of interference effect for the two-layer horizontal model

L model

Single shot record of the L model

Comparison of imaging effects of the L model

Salt dome model

Input shot records of the salt dome model

Comparison of interference effect shot records of the salt dome model

Comparison of reverse time migration of interference effect for the salt dome model

Conventional interferometric imaging effect

Comparison of computational costs

Actual data from an eastern work area in China

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