북극해 척치해저고원 남서부 대륙사면에서의 가스하이드레이트 탐사
Exploration of the Gas Hydrates on the Southwestern Continental Slope of the Chukchi Plateau in the Arctic Ocean
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2016년 실물 가스하이드레이트가 최초로 채취되었던 북극 척치해저고원 남서부 대륙사면 해저산군집지역을 중심으로 그 주변에 대한 가스하이드레이트 분포를 규명하기 위한 단일채널 탄성파 탐사가 수행되었다. 탄성파 단면에서는 대륙사면 지역에 나타나는 반전된 위상을 가진 강한 반사 신호를 확인할 수 있었다. 해저 지열류량과 해저면 수온을 기반으로 계산한 가스하이드레이트 안정영역 하부경계와의 비교를 통해 탄성파 단면상에 나타나는 반전된 위상을 가진 강한 반사 신호가 가스하이드레이트 부존에 따른 해저면 모방 반사면임을 확인하였다. 이는 북극 척치해저고원 남서부 대륙사면 지역에 대한 가스하이드레이트 분포를 지구물리학적 자료를 기반으로 최초로 제시한결과이다. 제안된 가스하이드레이트 부존을 지시하는 해저면 모방 반사면 분포도는 향후 해당 지역 가스하이드레이트 탐사 및 연구에 중요한 기초 참고자료로 활용될 수 있을 것으로 기대하고 있다.
Abstract
A single-channel sparker seismic survey was conducted to investigate the distribution of gas hydrates around a sea mound cluster on the southwestern slope of the Chukchi Plateau, where the gas hydrates were first recovered by gravity coring in 2016. Reflections with reversed polarity were discovered on the continental slope of the acquired seismic sections. The depths of the lower bound of the gas hydrate stability zone calculated from the heat flow data and the water temperature at the seafloor were used to confirm that these reflections were gas hydrate related bottom simulating reflections (BSRs). This implies that the regional distribution of gas hydrates in the southwestern continental slope of the Chukchi Plateau is being reported for the first time based on geophysical data. The proposed distribution map of the BSRs related to the gas hydrates is expected to be used as significant information for future gas hydrate surveys in the Chukchi Sea.
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