全方位偏移成像技术在南马庄潜山构造带的应用

doi:10.11720/wtyht.2020.1042

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Abstract

With the deepening of the oil and gas exploration and development,geological object is becoming more and more complex.Due to the requirement of increasing the precision of seismic imaging,especially with the development of high-density and wide-azimuth and wide-band seismic exploration technology,the direction of anisotropy is more and more prominent in the seismic data processing.However,the conventional Kirchhoff prestack time and depth migration uses both offset gathers,the angle gathers information fails to be retained and therefore it is unable to meet the demand of the current seismic processing.By way of full wave field and multipath,full azimuth migration imaging applies all seismic data in a continuous manner in underground local angle domain and generates two complementary full azimuth direction angle gathers and full azimuth common refection angle gathers.Fairly good application effect has been achieved in the migration imaging of Nanmazhuang buried hill tectonic belt,as shown by the facts that the imaging accuracy is improved,the geological phenomena is clearer,and the prediction of fracture density and development direction is more reliable.

Key words： migration imaging anisotropic direction angle gathers common refection angle gathers

Received: 14 May 2019 Published: 03 March 2020

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	Articles by authors
	Hong-Wen ZHANG
	Xi-Heng LIU
	Xing-Hai ZHOU
	Liu-Wu LI
	Xi-Shan DU
	Cheng-Quan WANG

Cite this article:

Hong-Wen ZHANG,Xi-Heng LIU,Xing-Hai ZHOU, et al. The application of full azimuth migration imaging technology to Nanmazhuang buried hill tectonic belt[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 25-33.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1042 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/25

Spatial mapping of rays between the ground and underground

The development model of Nanmazhuang buried hill in Raoyang

Old profile of study area
a—profile of pre-stack time migration;b—profile of pre-stack depth migration(time domain)

Interference waves in study area

LIFT denosie

Comparison of deconvolution
a—profile and autocorrelation function before deconvolution;b—profile and autocorrelation function after deconvolution;c—frequency spectrum curve before deconvolution;d—frequency spectrum curve after deconvolution

Comparison of residual static correction
a—before residual static correction;b—after the residual static correction

CIP Gather and residual moveout
a—CIP gather;b—residual moveout

Kirchhoff prestack depth migration flow

RTM (Inverse-time migration) flow

Comparsion of sections before(a) and after(b) weighted superposition of mirror images

Comparsion of offset gather and angle gather
a—residual spectrum of common offset gather;b—residual spectrum of common reflection angle gather

Comparison of seismic imaging results
a—Kirchhoff pre-stack depth migration;b—reverse time migration;c—full azimuth migration

New(a) and old(b) profile comparsion

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