南海南部深水区低品质地震资料处理关键技术

doi:10.11720/wtyht.2019.1007

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Abstract

The prospect of exploration in southern South China Sea is widest,but the seismic data are very rare and the quality is low.The deepwater block seismic data in southern South China Sea are constrained by low quality seismic data acquired in the 1970s,characterized by no navigation text,time uncertainty of record about seabed,serious lack of traces and very short cable,which results in unique seismic processing results with serious multiples,low signal-to-noise ratio and illegibility of stratigraphic structure record on paper.To solve these problems,the authors use and develop a set of key technologies that are suitable for seismic data processing in this area,such as using navigation reconstruction technique to solve the problem of lack of navigation text,using self-correlation technique to solve the problem of seabed records uncertainty,using the frequency limited F-K domain interpolation technique to solve the problem of lack of traces,using combination multiples suppression technique to solve the problem of multiples suppression caused by short cable.The final results show that the applications of key technologies make the seismic data achieve expected effect in this area.These technological achievements not only provide reliable seismic data for deepwater oil and gas exploration in southern South China Sea but also provide some ideas and techniques for similar low-quality seismic data processing.

Key words： South China Sea deepwater exploration low-quality seismic data navigation processing trace interpolation

Received: 05 January 2018 Published: 31 May 2019

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	Articles by authors
	Zhi-Zhong ZHANG
	Lan XIE
	Hua CHEN
	Dian-Min QIN
	Qiu-Han HE
	Min ZHAO
	Kun CHANG

Cite this article:

Zhi-Zhong ZHANG,Lan XIE,Hua CHEN, et al. The key technologies for the processing of low-quality deepwater block seismic data in southern South China Sea[J]. Geophysical and Geochemical Exploration, 2019, 43(3): 576-583.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1007 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I3/576

Steps of navigation data reconstruction method
a—reference line base map;b—initial navigation line map;c—navigation line map after excluding outliers;d—final navigation line map

Seismic processing section closure diagrams after reconstruction of navigation information

Comparison of stack sections before and after reflection time correction of sea bottom interface
a—Stack section before reflection time correction of sea bottom interface;b—Stack section after reflection time correction of sea bottom interface by autocorrelation

Near-channel autocorrelation profile of seismic data

The effects of different channel interpolation methods
a—Initial shot gathers;b—Shot gathers after interpolation in F-X domain;c—Shot gathers after interpolation in F-K domain

SRME combined with improved SWMA for multiple suppression
a—Stack section(left)、CDP(mid)、velocity spectrum(right) before multiple waves suppression;b—Stack section(left)、CDP(mid)、velocity spectrum(right) after multiple waves suppression by the SRME;c—Stack section(left)、CDP(mid)、velocity spectrum(right) after multiple waves suppression by the SRME combined with improved SWMA

Comparison of new(b) and old(a) stack sections

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