Thickness Estimates from Instantaneous Phase Spectrum of Poststack Seismic Data

CAI Han-peng,LONG Hao，HE Zhen-hua,LI Ya-lin，DENG Ji-gang，HE Guang-ming，ZOU Wen

doi:10.11764/j.issn.1672-1926.2014.04.574

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 4: 574 - 581

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.04.574

Thickness Estimates from Instantaneous Phase Spectrum of Poststack Seismic Data

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1.Geophysical Exploration Company,Chuanqing Drilling Engineering Co.Ltd.,CNPC,Chengdu 610213,China;
2.Key Lab of Earth Exploration and Information Techniques of Ministry of Education,Chengdu University of
Technology,Chengdu 610059,China;3.College of Geophysics,Chengdu University of Technology,Chengdu 610059,China

Received date: 2013-07-20

Revised date: 2013-08-23

Online published: 2014-04-10

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Abstract

Thickness estimates using instantaneous phase spectrum of post-stack seismic data was explored to estimate bed thickness that is less than tuning thickness.Objective function for thickness estimates,in this method,was constructed on the basis of the instantaneous phase spectrum in the available seismic frequency band,in which magnitude and polarity of seismic reflectivity and the dominant frequency of seismic wavelet were not need to be considered.Synthetic data test showed that on the premise of seismic data without noise,bed thickness of less than and greater than tuning thickness is estimated accurately,and bed thickness estimates using the proposed method is not affected by the frequency bandwidth of seismic data and magnitude and polarity of seismic reflectivity,but thickness estimates is contaminated seriously by noise.Real seismic data examples was evaluated to demonstrate that when SNR of seismic data within the effective frequency band is very high,estimation error employing this method,compared with well logging and interpretation data,is less than 10%,providing the basis for drilling deployment of petroleum reservoir exploration and development.

Key words： Tuning thickness; Thickness estimates; Instantaneous phase spectrum; Travel time; Spectral decomposition

Cite this article

CAI Han-peng,LONG Hao，HE Zhen-hua,LI Ya-lin，DENG Ji-gang，HE Guang-ming，ZOU Wen . Thickness Estimates from Instantaneous Phase Spectrum of Poststack Seismic Data[J]. Natural Gas Geoscience, 2014 , 25(4) : 574 -581 . DOI: 10.11764/j.issn.1672-1926.2014.04.574

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