东方1-1构造底辟模糊区OBN资料关键处理技术及应用

doi:10.11720/wtyht.2023.0006

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Abstract

The Dongfang 1-1 structure is situated in the northern part of the central mud diapir tectonic belt of the Yinggehai Basin on the northern continental shelf of the South China Sea.The Dongfang 1-1 gas field is the first uncompartmentalized shallow gas field discovered in the Yinggehai Basin.Despite abundant oil and gas reserves in this region, the imaging of the diapir fuzzy zone has been a critical factor restricting oil and gas exploration in this region.The original streamer-based seismic data,through multiple rounds of multi-company reprocessing,still failed to effectively image the diapir fuzzy zone.Therefore,the second acquisition of three-dimensional ocean bottom node(OBN) seismic data was conducted in this region.According to the geological conditions and the characteristics of OBN data in this region,this study proposed several critical processing techniques,including OBN preprocessing,multi-component joint shear-wave noise suppression,wavelet-domain dual-sensor summation,and full-waveform-inversion(FWI) high-precision velocity modeling.These techniques effectively improved the imaging of shallow fault structures and middle and deep diapir fuzzy zones,thus providing reliable fundamental data for the subsequent target evaluation.

Key words： Dongfang 1-1 structure diapir fuzzy zone OBN seismic data dual-sensor summation FWI high-precision velocity modeling

Received: 03 March 2023 Published: 23 January 2024

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	Articles by authors
	Min ZHANG
	Dun DENG
	San-Fu LI
	Wen-Ying SHI
	Xing-Yan ZHANG
	Ling ZHI

Cite this article:

Min ZHANG,Dun DENG,San-Fu LI, et al. Critical processing techniques for ocean bottom node data of the diapir fuzzy zone of the Dongfang 1-1 structure and their application[J]. Geophysical and Geochemical Exploration, 2023, 47(6): 1456-1466.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.0006 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I6/1456

Secondary 3D OBN acquisition parameters of Dongfang 1-1 structure

The Node secondary positioning quality control
a—statistical of node positioning position difference before and after cable laying;b—after linear correction of direct wave

Analysis of shear wave noise characteristics and effect of conventional suppression method
a—z component common receiver gathers;b—z component common shot gathers;c—the cross-spread arrangement schematic diagram;d—the cross-spread receiver gather;e—common receiver gathers before shear wave noise suppression;f—common receiver gathers after shear wave noise suppression;g—common shot gathers before shear wave noise suppression;h—common shot gathers after shear wave noise suppression

Effect analysis before and after pre-processing
a—linear NMO correction of direct wave before preprocessing;b—linear NMO correction of direct wave after preprocessing;c—stacked section before preprocessing;d—stacked section after preprocessing

Principle of shear wave noise suppression and predicted noise mode
a—far offset z component and x component left and right contrast diagram;b—far offset z component and y component left and right contrast diagram;c—near offset z component and x component left and right contrast diagram;d—near offset z component and y component left and right contrast diagram;e—z component common reciever gathers;f—the z component shear wave noise model predicted by this method

Analysis of transverse wave suppression effect
a—P component stack section;b—the stack section before z component shear wave noise suppression;c—z component conventional method superposition profile after shear wave noise suppression;d—z component superposition profile after shear wave noise suppression is used in this method;e—spectrum analysis curves before and after denoising with different methods;f—S/N ratio analysis curves before and after denoising by different methods

Schematic diagram of double check merging

Effect analysis of dual-sensor instrument response
a—hydrophone instrument response;b—geophone instrument response;c—the phase spectrum of hydrophone and geophone instrument response;d—the frequency spectrum of hydrophone instrument response;e—the frequency spectrum of geophone instrument response;f—the matching operator;g—the left and right comparison diagram of hydrophone and geophone before instrument response correction;h—the left and right comparison diagram of hydrophone and geophone after instrument response correction

Effect analysis of dual-sensor summation in Wavelet Domain
a—P component stacking profile before dual-sensor summaton;b—the primary wave superposition profile after dual-sensor summation;c—the receiver ghost wave stacking profile after dual-sensor summation;d—P component cdp gather before dual-sensor summation;e—the primary wave cdp gathers after cross-ghosting method;f—the primary wave cdp gathers after this method

The frequency spectrum of dual-sensor and the frequency spectrum of the different dual-sensor summation

Effect analysis of FWI velocity inversion and vertical velocity component and high precision grid tomography inversion
a—initial velocity model;b—the main frequency 4.5 Hz refracted wave FWI;c—the main frequency 6 Hz refracted wave FWI;d—the main frequency 8 Hz refracted wave FWI;e—the main frequency 10 Hz refracted wave FWI;f—the main frequency 12 Hz refracted wave FWI;g—initial velocity model;h—final velocity model

The effect analysis of new and old data imaging profile
a—towed cable old data prestack depth migration imaging profile;b—OBN new data prestack depth migration imaging profile

The effect analysis of variance body attribute
a—towed cable old data 1 300 m variance volume slice;b—OBN new data 1 300 m variance volume slice

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