基于宽频资料的扩展弹性阻抗反演方法在陆丰22洼陷低勘探区古近系岩性预测中的应用

doi:10.11720/wtyht.2022.1135

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Abstract

Areas at a low exploration level have drawn increasing attention as future contributors to reserves growth.However,they are facing many geophysical challenges.Lufeng 22 subsag is such an area due to few drilled wells and insufficient geological data.In this case,it is difficult to build an accurate low-frequency inversion model using traditional logging data or stacking velocity.Moreover,affected by ghost reflections,low- and high-frequency waves in marine seismic data are suppressed.As a result,the bandwidth of seismic data is decreased,thus reducing the authenticity and accuracy of inversion results.To address these problems,this paper firstly obtained seismic data with broader bandwidth using broadband processing technology.Then,it built a low-frequency model for areas without well control using colored inversion combined with a high-precision velocity field obtained through tomographic imaging.Based on this,this paper predicted the distribution of source rocks and reservoirs using the extended elastic impedance inversion method.This technology was applied to the Lufeng 22 subsag,enabling the successful prediction of the distribution of high-quality source rocks and favorable reservoir areas.Thick layers of middle-deep lacustrine-facies source rocks as well as oil and gas have been discovered during the drilling of the first exploration well in the subsag,which started the exploration in the new area.This study indicates that this technology effectively improves the reliability of seismic inversion of middle-deep layers using broadband data and can well identify lithology utilizing low-frequency information,thus serving as an effective technology for the lithology prediction of areas at a low exploration level.

Key words： Paleogene broadband seismic low-frequency model extended elastic impendence inversion

Received: 12 March 2021 Published: 28 June 2022

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	Articles by authors
	Zhang-Bo XIAO
	Yong-Chang LEI
	Jun-Qing YU
	Qiong-Ling WU
	Chao-Qun YANG

Cite this article:

Zhang-Bo XIAO,Yong-Chang LEI,Jun-Qing YU, et al. Application of broadband data-based extended elastic impedance inversion method in Paleogene lithology prediction of areas at a low exploration level in Lufeng 22 subsag[J]. Geophysical and Geochemical Exploration, 2022, 46(2): 392-401.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1135 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I2/392

Technical flowchart of well-free broadband seismic inversion

Comparison of seismic section processed by conventional(a) and broadband processing(b) methods

Comparison between amplitude spectrum of conventional seismic data and broadband seismic data

Comparison of seismic data inversion section processed by conventional(a) and broadband(b) processing methods

Construction flowchart of low frequency constraint model
a—initial low frequency constraint model;b—relative low frequency constraint model;c—final low frequency constraint model

Analysis of the correlation between EEI and TOC,porosity at different rotation angles

Comparison of EEI curve,TOC curve and porosity curve with different rotation angles

Extended elastic impedance EEI corresponding to TOC(a) and porosity(b)

Geochemical parameters of source rocks in WC4 of Lufeng sag

Extended elastic impedance EEI(25°) inversion section

Geochemical logging map of LF-H well

Distrbution map of source rock in WC3+WC4
a—source rock thickness map of WC3+WC4;b—TOC content distribution of source rocks in WC3+WC4

Extended elastic impedance EEI(40°) inversion section

Plane distribution characteristics of sandstone
a—the root mean square attribute of sandstone;b—plane distribution of sandstone porosity

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