构造导向的深度偏移井震误差校正方法

doi:10.11720/wtyht.2025.1451

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Abstract

Log-seismic error correction serves as a primary method for determining Thomsen's compressional-wave anisotropic parameters of vertical transverse isotropy(VTI) media.This method is also an essential processing technique for obtaining accurate depth-migrated images.Conventional log-seismic error correction involves determining the log-seismic errors at well locations and then directly applying planar interpolation to correct the depths of seismic horizons.However,the conventional method can lead to structural distortions and anomalous values of anisotropic parameter δ in areas with significantly varying formation thicknesses.To address this issue,researchers typically manually edit and smooth the anisotropic parameter field and the anisotropic velocity field,consuming considerable manpower and time.Hence,this study proposed a structure-oriented log-seismic error correction method that incorporates the concept of log-seismic error coefficient.The proposed method utilizes formation thicknesses as constraints to perform planar interpolation for log-seismic errors.Moreover,it employs a strategy of sequential calculation and interpolation for log-seismic errors from shallow to deep formations.It yielded log-seismic error distribution values that better conform to formation thickness variations and more stable δ values,without anomalous values.Therefore,the proposed method effectively avoids structural distortions induced by log-seismic error correction while saving manpower and time in practical projects.

Key words： prestack depth migration log-seismic error correction anisotropy parameter δ structure-oriented

Received: 05 December 2024 Published: 07 August 2025

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	Articles by authors
	Bing-Gang WANG
	Cheng-Zhen DING
	Dan ZHANG
	Qing-Yu DONG
	Xin CHEN
	Ze WANG
	Yang YANG
	Rui-Qing XUAN

Cite this article:

Bing-Gang WANG,Cheng-Zhen DING,Dan ZHANG, et al. Structure-oriented log-seismic error correction in prestack depth migration[J]. Geophysical and Geochemical Exploration, 2025, 49(4): 838-845.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1451 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I4/838

Traditional workflow of well-tie correction methodology

Traditional well-tie correction method

Structure guided well-tie correction method

Work flow of structure guided well-tie correction methodology

Schematic of strike-slip fault

Formation thickness map and mistie value map calculated by traditional method and new method

Section of anisotropic parameter δ calculated by new method(a) and traditional method(b)

Pre-stack depth migration section after well-tie correction calculated by new method(a) and traditional method(b)

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