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Review

Petroleum Exploration Guide for the Southern Shelf of the Ulleung Back-Arc Basin, East Sea, Korea

동해 울릉 배호 분지 남부 대륙붕의 석유 탐사 가이드

고재홍 · 윤준일

Jaehong Ko and Junil Yoon

31 August 2016. pp. 364-376
PDF Citation
Abstract
The Ulleung Basin was formed as a result of extension in Miocene behind the island-arc with the Japan andYamato basins. The southern shelf of the basin was constructed by stacked prograding deltaic sequences over 10 km inthickness. Three depositional sequences, separated by unconformities of 12.5 and 6.3 Ma, portray the majortransgressive-regressive-transgressive cycles of the back-arc. Each cycle corresponds to opening and continuoussubsidence, destruction of back-arc due to compression, and post-closure regional subsidence, respectively. Source rockis not confirmed yet, but deep water facies and prodeltaic shales in the lower sequences are potential candidates.Sandstones of good porosity are widespread as delta front and plain sands of shelfal sequences. Deep water turbiditicsandstones also frequently have good reservoir quality. Transgressive and prodeltaic shales provide seal. Structural trapsare along NE-SW and N-S folds. Numerous geophysical anomalies indicative of hydrocarbon presence are common indeeper sections of the basin.
Keywords
Ulleung back-arc
Southern shelf basin
Petroleum geology
Geophysical amomalies
울릉 분지는 일본 분지, 야마토 분지와 더불어 마이오세 화산호 배후에서 확장에 의해 형성된 배호분지이다. 울릉 분지 남부 대륙붕은 전진 구축하는 삼각주 퇴적층이 해침․ 퇴로 겹겹이, 두께 10 km 이상으로쌓여 조성되었다. 층서는 12.5 Ma와 6.3 Ma 부정합면으로 구분되는 3개의 순차층군으로 구성된다. 하부 층군은동해가 열리고 지속적인 침강으로 해침 우세 환경에서 퇴적되고, 12.5 Ma 남부에 습곡-단층대를 형성시킨 압축구조 운동으로 해퇴 우세로 바뀌는 대변화가 일어났으며, 6.3 Ma 부정합면을 경계로 융기 지역들이 평탄화되고,침강하면서 해진 우세 환경으로 되돌아가게 된다. 근원암은 확실치 않으나 하부의 분지 퇴적상 및 전 삼각주셰일이 유력하다. 삼각주 전면 및 평원에서 퇴적된 공극률이 양호한 사암이 대륙붕 경사층형의 표면층으로 널리분포하여 저류암을 형성한다. 심해에서 퇴적된 저탁류에도 저류에 적합한 사암의 빈도가 높다. 덮개암은 해침성셰일과 전 삼각주 셰일이다. 탄화수소의 트랩은 북동-남서 및 남-북 방향의 습곡이 구성한다. 분지의 심부에서석유 부존을 지시하는 지구물리적 이상이 흔하게 관찰된다.
키워드
울릉 배호 분지
남부 대륙붕
석유 지질
지구물리적 이상
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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 : 53
  • No :4
  • Pages :364-376
  • DOI :https://doi.org/10.12972/ksmer.2016.53.4.364
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