不同方位各向异性反演技术对比和总结

doi:10.11720/wtyht.2024.1251

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Abstract

The progress in seismic acquisition techniques characterized by wide azimuths,wide frequency bands,and high densities has greatly promoted the application of the prestack P-wave fracture inversion technique based on the azimuthal anisotropy theory.Azimuthal anisotropy-based inversion can yield the azimuths and intensities of fractures.However,different inversion techniques yield different parameters for fracture intensity characterization,resulting in inconsistent inversion results.Consequently,the azimuthal anisotropy-based inversion results of fractures are non-unique,leading to confusion about accurate results.Based on the Thomsen anisotropy theory,as well as the interrelationships between fracture models(the Hudson coin model and the Schoenberg linear sliding model),this study established the connections of anisotropic parameters between different fracture inversion techniques(VVAZ,Ruger's approximation,and Fourier series),presenting the real meanings and mathematical expressions of results from different azimuthal anisotropy-based fracture inversion techniques.Additionally,this study summarized the relationships of parameters between different inversion techniques and fracture models,further deepening the research on azimuthal anisotropy-based fracture inversion.This study lays solid theoretical and technical foundations for large-scale fracture detection based on the seismic data obtained using the seismic acquisition techniques featuring wide azimuths,wide frequency bands, and high densities.

Key words： azimuthal anisotropy fracture inversion VVAZ Ruger's approximation Fourier series

Received: 19 June 2023 Published: 16 April 2024

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	Zhi-Qiang LIANG
	Hong LI

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Zhi-Qiang LIANG,Hong LI. Comparison and summary of different azimuthal anisotropy-based inversion techniques[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 443-450.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1251 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/443

HTI media model

Hudson’s penny-shaped crack model

Linear-slip model

Comparison of frequency spectrum results between VVAZ and AVAZ inversion results

The technical process of AVAZ fracture prediction

Comparison of Ruger style(a) and Fourier coefficients algorithm(b)

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Comparison of Ruger style and Fourier coefficients for shale gas applications(revised from Downton^[12])

技术类型属性参数		时差类	振幅类
技术类型属性参数		VVAZ	Ruger近似	傅立叶级数
数据		旅行时	振幅	振幅
属性类型		层间	界面	界面
各向异性方位 (裂缝方位)		明确的	90°误差	明确的
各向异性结果 (裂缝强度)		$V p_f a s t - V p_s l o w V p_f a s t$	B_ani	B_ani、Δ_T、Δ_N
参数关系	Thomsen	-δ	Δε、Δ_T、Δ_N	Δε、Δ_T、Δ_N
	线性滑动模型	Δ_T、Δ_N 的加权和	Δ_T、Δ_N 的加权差分	Δ_T、Δ_N
	薄币模型	ε和Ω	Δε和ΔΩ	Δε和ΔΩ
分辨率		较低	较高	高

Summary of comparison of azimuthally anisotropic fracture inversion techniques

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