基于拉伸率的3DVSP道集切除技术及应用

doi:10.11720/wtyht.2022.2325

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Abstract

3DVSP common detection point gathers produce different tensile distortion effects at different offsets after conventional processing,especially at the shallow layer and large offset,which affects the imaging quality of the superimposed section.In view of such a situation,the author analyzed the stretch effect reason,deduced the stretch rate formula,and proposed a trace-set cutting method based on stretch rate:to calculate the stretch rate of each point in the trace set of common detection points point by point,determine the range of effective stretch rate,and cut the points with excessive stretch rate.The results of model analysis and actual data processing show that the method is correct and effective.

Key words： 3DVSP tensile rate gather cutting stacking profile imaging

Received: 23 October 2020 Published: 25 February 2022

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	Jie ZHANG

Cite this article:

Jie ZHANG. 3DVSP channel gather cutting technique based on tensile ratio and its application[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 169-174.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.2325 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/169

Diagram of the relationship between shot point and detection point of variable offset VSP

VSP imaging region of one detection point

The relationship between offset and tensile ratio at different receiving depth

The relationship between target depth and tensile ratio at different offset

The CDP gather with dynamic correction

CDP gather tensile ratio

Spectral comparison before and after excision

Containing 5% intensity random noise CDP channel set(a) and spectral comparison before and after excision(b)

Containing 10% intensity random noise CDP channel set(a) and spectral comparison before and after excision(b)

Containing 20% intensity random noise CDP channel set(a) and spectral comparison before and after excision(b)

Spectral comparison before and after the resection of the tensile ratio exceeding 1.0

Common receive gather before(a) and after(b) resection

3D VSP prestack time migration imaging profile

CDP image gather before (left) and after (right) resection

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