地震正演技术在深反射地震剖面探测中的应用

doi:10.11720/wtyht.2021.1122

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Abstract

Seismic wave forward modeling technology is widely used in shallow exploration.This method can combine geological model and seismic model organically to verify and guide the acquisition,processing and interpretation of seismic data.The deep reflection seismic profile detection technology based on the oil reflection seismic technology has been very mature after decades of development and application.But up to now,the application of seismic wave forward modeling in deep reflection seismic profile is very insufficient.In this paper,the deep reflection seismic profile across Sichuan Basin was used to carry out forward modeling.By comparing and fitting the horizon of forward simulation data and actual seismic data,the parameters such as velocity and horizon were constantly modified,and the final depth domain geological model was established,which provides more accurate stratigraphic information such as crustal thickness and Moho depth for structural profile.Through the geological model in depth domain,it is revealed that the angle of Neoproterozoic paleosubduction in the northwest margin of Yangtze plate was about 30 °,and the depth of subduction reached 60 km.

Key words： forward modeling deep reflection seismic geological model ray tracing Moho

Received: 02 April 2020 Published: 20 August 2021

ZTFLH:

P631.4

Corresponding Authors: WANG Hai-Yan E-mail: 1175712161@qq.com;hyanwhy@126.com

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	Guang-Wen WANG
	Hai-Yan WANG
	Hong-Qiang LI
	Wen-Hui LI
	Yong-Xiang PANG

Cite this article:

Guang-Wen WANG,Hai-Yan WANG,Hong-Qiang LI, et al. Research and application of seismic forward simulation technology in deep reflection seismic profile detection[J]. Geophysical and Geochemical Exploration, 2021, 45(4): 970-980.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1122 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I4/970

Location of deep seismic reflection profile

Data acquisition parameters of deep reflection seismic profiles across Sichuan Basin

Initial geological model

Crustal thickness-velocity of Sichuan Basin

Crustal velocity structure of Sichuan Basin

Initial velocity model horizon velocitym/s

Spectrum analysis of original single-shot

Wavelet spectrum
a—real time;b—amplitude spectrum;c—quadrature time;d—phase spectrum

Ray tracing routing
a—zero offset seismic record;b—common shot gather record

Comparison of common shot point gather records
base map—original single shot record;overlay map—simulate single shot record;a1、a2—100km comparison of ray tracing forward simulation before and after single shot correction;b1、b2—200km comparison of ray tracing forward simulation before and after single shot correction;c1、c2—280km comparison of ray tracing forward simulation before and after single shot correction;d1、d2—280km comparison of wave equation forward modeling before and after single shot correction

Iteration velocities offorward simulation horizonskm/s

10])
">

Migration stack profile(revised according to reference [10])

Contrasting map between simulation data and seismic stack data
base map—deep reflection stacked profile;overlay map—zero offset simulation profile;a1、a2—comparison before and after iterative correction of the first layer;b1、b2—comparison before and after iterative correction of the second layer;c1、c2—comparison before and after iterative correction of the third layer;d1、d2—comparison of the fourth layer and the fifth layer before and after iterative correction

Final geological model of Sichuan Basin

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