井中地震粘声逆时偏移成像影响因素分析

doi:10.11720/wtyht.2022.1307

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Abstract

At present,the targets of oil and gas exploration have transformed from simple structural oil and gas reservoirs into deep complex structural oil and gas reservoirs.The small thickness,wide distribution,and hidden occurrence state of the reservoirs pose great challenges to seismic migration imaging technology.Compared with ground seismic,the seismic sources of the borehole seismic are located in wells and close to target layers.Meanwhile,the times that wave field induced by the borehole seismic passes through the low-velocity zone reduce by one.Therefore,the borehole seismic has the advantages of high signal-to-noise ratio (SNR) of data and strong reservoir identification in theory and thus can serve the purpose of the fine imaging of the reservoirs around wells.However,the special observation method makes it difficult to directly apply mature ground seismic imaging technology to the borehole seismic.In addition,due to the weak source energy of the borehole seismic,the formation absorption attenuation effect produces stronger impacts on the borehole seismic than on the ground seismic.Therefore,it is necessary to develop a targeted migration imaging method for borehole seismic.This study applied the visco-acoustic reverse-time migration imaging method to the borehole seismic and discussed the influence of various factors on the migration imaging effect of borehole seismic through model calculation,aiming to provide theoretical and technical support for the practical application of borehole seismic technology.

Key words： borehole seismic fractional visco-acoustic wave equation absorption compensation visco-acoustic reverse time migration

Received: 13 August 2021 Published: 17 August 2022

ZTFLH:

P631.4

Corresponding Authors: WANG Ji-Chuan

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	Hong-Wei YANG
	Ji-Chuan WANG
	Qing-Feng KONG
	Bing-Luo GU
	Wei-Guo SUN
	Zhen-Chun LI

Cite this article:

Hong-Wei YANG,Ji-Chuan WANG,Qing-Feng KONG, et al. An analysis of influencing factors of visco-acoustic reverse time migration imaging in borehole seismic[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 877-886.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1307 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/877

Schematic diagram of 2D borehole seismic observation system

Schematic diagram of 3D borehole seismic observation system

Principles of wavefield propagation and reverse time migration in boreholes seismic

Schematic diagram of wavefield propagation in visco-acoustic reverse time migration

Schematic diagram of the source wave field and the receiver wave field in visco-acoustic reverse time migration

BP gas chimney model

The visco-acoustic reverse time migration results of the BP model with different shot spacing

The visco-acoustic reverse time migration results of the BP model with different shot number

The visco-acoustic reverse time migration results of the well at different positions relative to the target layer

Seismic ray path and coverage map in well

Comparisons of visco-acoustic reverse time migration images for BP model

Local comparison diagram of seismic visco-acoustic reverse-time migration profile and surface seismic profile in well

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