Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Stratigraphy and Paleoenvironment of Domi-1 and Sora-1 Wells, Domi Basin

도미분지 도미-1, 소라-1공의 층서와 고환경

  • Yun, Hye-Su (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Byun, Hyun-Suk (Natural History Reasearch Institute) ;
  • Oh, Jin-Yong (Research Institute of Natural Sciences, Chungnam National University) ;
  • Park, Myong-Ho (Korea National Oil Corporation) ;
  • Lee, Min-Woo (Department of Geology and Earth Environmental Sciences, Chungnam National University)
  • 윤혜수 (충남대학교 지질환경과학과) ;
  • 변현숙 ((주)자연사연구소) ;
  • 오진용 (충남대학교 자연과학연구소) ;
  • 박명호 (한국석유공사 석유개발연구원 CCS 전담반) ;
  • 이민우 (충남대학교 지질환경과학과)
  • Received : 2012.07.11
  • Accepted : 2012.08.15
  • Published : 2012.08.28
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Abstract

There has been much debates on the geologic age of the sediments of the Domi Basin, since age results varied after research methods and fossil groups. This study carried out palynological analysis and seismic interpretation to establish a stratigraphy and environmental reconstruction mainly based on fossil dinoflagellates and Seismic data from the Domi-1 and Sora-1 wells. The dinocyst assemblages found enabled zonation of the well sediment sequence resulting in 4 ecozones. Index fossils among dinocysts and palynomorphic substances indicate geologic age of the well ranges from Eocene to Pleistocene, and paleoenvironment varies from freshwater to inner-neritic marine. The fossil association also suggests strong relationship to Japanese Tertiary basins in Kyushu area in terms of stratigraphy and basin developmental history.

도미분지에 위치한 도미-1공과 소라-1공을 대상으로 와편모조류 미화석, 유기물상 분석 및 탄성파자료 해석을 통한 지층대비의 방법으로 연구지역의 층서와 고환경을 해석하고, 그 결과를 일본 북서 큐슈지역의 기존 연구결과와 비교하였다. 생물상변화를 토대로 상부에서부터 Ecozone A, Ecozone B(Barren zone), Ecozone C, Ecozone D(Barren zone)로 각각 4개의 생태층서대로 나누었다. 표준화석에 의한 지질시대는 2개 시추공 모두 하부로부터 에오세 - 올리고세, 마이오세, 플라이오세 - 플라이스토세 시기로 나타났다. 유기물상에 의한 고환경은 상부에서 시작하여 다음과 같이 5개로 나누었다; Association I(Inner neritic), Association II(Freshwater), Association III(Inner neritic), Association IV(Freshwater), Association V(Swamp). 두 개의 시추공 자료를 토대로 일본 측 생층서 자료와 비교 한 결과, Heteraluacacysta campanula, Tubiosphaera galatea 등의 에오세 - 올리고세 표준화석이 양측 연구 모두 동일하게 나타나고, 두 지역의 군집조성이 유사함을 확인하였다. 이는 도미분지와 일본의 북서 큐슈 지역의 고제3기층 발달사에 서로 연관성이 있음을 시사한다.

Keywords

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