Shallow Gas Discrimination of Multicomponent Seismic Data Using Seismic Physical Modeling

Daechul Kim; Sungryul Shin; Wookeen Chung; Kyoungmin Lim

doi:10.32390/ksmer.2022.59.6.634

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2022 Vol.59, Issue 6 Preview Page Next Page

Research Paper

Shallow Gas Discrimination of Multicomponent Seismic Data Using Seismic Physical Modeling 탄성파 축소모형 실험을 활용한 다성분 탄성파 자료의 천부가스 판별

31 December 2022. pp. 634-643

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Abstract

In this study, multicomponent seismic physical modeling was performed by injecting air with similar shallow gas density and velocity into a geological model with a fault and a channel, and seismic sections and time slices were acquired. To discriminate the shallow gas in the model, a direct hydrocarbon indicator was used and seismic attribute analysis was conducted using the acquired data. The results of the analysis showed a bright spot and seismic wipeout. Through S-wave seismic exploration, shallow gas could be identified from the seismic wipeout, which did not appear in the P-wave seismic data. Moreover, the shape of the channel was confirmed based on the seismic wipeout. In addition, in the complex seismic trace analysis, the maximum amplitude increased in the air-injected channel, and a low-frequency shadow occurred due to the attenuation of high-frequency energy due to the shallow gas.

Keywords

Multicomponent seismic exploration

Seismic physical modeling

Shallow gas discrimination

Direct hydrocarbon indicator

Seismic attribute analysis

이 연구에서는 단층과 채널을 모사한 지층모델에 천부가스와 밀도 및 속도가 유사한 공기를 주입하여 다성분 탄성파 축소모형 실험을 수행하였으며, 탄성파 단면과 시간 경과 탄성파 단면도(time slice)를 생성하였다. 취득한 자료에서 천부가스 판별을 수행하기 위하여 탄화수소 직접 지시자와 탄성파 속성분석을 수행하였고 천부가스 부존지역에서 탄화수소 직접 지시자인 명점, 탄성파 공백대를 확인하였다. S파 탐사를 통해서 P파에서 확인하기 어려운 탄성파 공백대를 통하여 천부가스를 판별하였으며, 추가적으로 탄성파 공백대를 통하여 채널의 형상을 확인하였다. 탄성파 복소 분석을 활용하여 최대 진폭 값을 분석하였을 때, 공기가 부존하는 채널 부근에서 진폭 값이 증가하는 것을 확인하였으며, 천부가스로 인한 고주파수 에너지 감쇠로 발생한 저주파수 음영대가 나타났다.

키워드

다성분 탄성파 탐사

탄성파 축소모형 실험

천부가스 판별

탄화수소 직접 지시자

탄성파 속성 분석

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 59
No :6
Pages :634-643
Received Date : 2022-10-04
Revised Date : 2022-10-31
Accepted Date : 2022-12-27
DOI :https://doi.org/10.32390/ksmer.2022.59.6.634

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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