面向高陡构造的黏声棱柱波逆时偏移

doi:10.13810/j.cnki.issn.1000-7210.2020.04.011

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Abstract Prismatic waves carry more information about steeply dipped structures which primaries can not reflect. Therefore,prismatic waves are separately used in some migration methods to improve the illumination and imaging effect of steeply dipped structures. However,attenuation leads to amplitude loss and phase distortion of seismic waves,which seriously affects the accurate imaging of prismatic waves. A viscoacoustic RTM (reverse time migration) of prismatic waves is proposed for imaging steeply dipped structures. First a Q-compensated forward-propagating operator and a back-propagating adjoint operator are derived,and then Q attenuation is compensated along the propagating path of prismatic waves. Application on two typical steeply dipped structural models has proved that:①viscoacoustic RTM of prismatic wave can produce better images of steeply dipped structures with higher signal-to-noise ratio,higher resolution and more balanced amplitude than conventional viscoacoustic RTM and acoustic RTM of prismactic wave,but losses some resolution of less dipped structures,therefore underground structures should be interpreted on viscoacoustic RTM and acoustic RTM of prismatic wave;②the time used for viscoacoustic RTM of prismatic wave is about 2 times that of viscoacoustic RTM,so the former needs a larger memory to save wavefields because it cannot reconstruct multiple wavefields at the same time.

Key words： viscoelasticity attenuation compensation prismatic wave reverse time migration (RTM) adjoint operator steeply dipped structure

Received: 30 October 2019

PACS:

P631

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	QU Yingming
	WEI Zhefeng
	LIU Chang
	LI Zhenchun
	XU Kai
	LI Runze

Cite this article:

QU Yingming,WEI Zhefeng,LIU Chang等. Viscoacoustic reverse time migration of prismatic wave for steeply dipped structures[J]. OGP, 2020, 55(4): 793-803.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2020.04.011 OR http://www.ogp-cn.com/EN/Y2020/V55/I4/793

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