基于近似真地表浮动面叠前深度偏移成像技术应用研究

doi:10.11720/wtyht.2022.2463

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Abstract

The conventional CMP floating datum processing method based on horizontal surface assumption is not suitable for the imaging of the complex tectonic area in the Southern Junggar Thrust Belt.This paper selects the floating datum of approximate true surface as the processing datum in both the time domain and the depth domain.The pre-stack time-domain preprocessing includes selecting optimal the near-surface bottom boundary,the static correction for surface consistency of approximate true surface,surface-consistent DSR NMO velocity analysis,and residual static correction,in order to maintain the consistency of the process and parameters from the time-domain preprocessing to pre-stack depth migration (PSDM).The selection of the floating datum makes the wavefield travel time closer to the actual travel path and realizes higher imaging precision and accurate geological structure.

Key words： complex structure approximate true surface DSR NMO surface consistency PSDM

Received: 29 December 2020 Published: 28 June 2022

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	Articles by authors
	Qiang-Feng DOU
	Yong LUO
	Xiao-Hai YANG
	Jia TAN

Cite this article:

Qiang-Feng DOU,Yong LUO,Xiao-Hai YANG, et al. Application of PSDM imaging technology based on floating datum of approximate true surface[J]. Geophysical and Geochemical Exploration, 2022, 46(2): 444-450.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.2463 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I2/444

The flow diagram of PSDM on rugged topography

The schematic diagram of different floating datum and surface bottom in depth domain

The schematic diagram of rugged topography statics

The comparation among different statics CMP gathers
a—CMP gather before statics;b—CMP gather after rugged topography statics;c—CMP gather after conventional statics

The schematic diagram of DSR NMO

The comparation between different NMO CMP gathers
a—CMP gather after SSR NMO;b—CMP gather after DSR NMO

The comparation between different NMO CMP gathers and stacks
a—CMP gather and stack after SSR NMO from rugged topography;b—CMP gather and stack after DSR NMO from ruged topography

The comparation between PSDM stack velocity overlays on different topography
a—PSDM on RG topography;b—PSDM on rugged topography

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