자원환경지질 (Economic and Environmental Geology)

  • 제45권5호
  • /
  • Pages.551-564
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  • 2012
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
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소라소분지 BP-1공의 층서연구

Stratigraphy of the BP-1 well from Sora Sub-basin

  • Oh, Jaeho (Korea Institute of Geosciece and Mineral Resources(KIGAM)) ;
  • Kim, Yongmi (Korea Institute of Geosciece and Mineral Resources(KIGAM)) ;
  • Yun, Hyesu (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Park, Eunju (Korea National Oil Corporation) ;
  • Yi, Songsuk (Korea National Oil Corporation) ;
  • Lee, Minwoo (Department of Geology and Earth Environmental Sciences, Chungnam National University)
  • 투고 : 2012.09.20
  • 심사 : 2012.10.20
  • 발행 : 2012.10.28
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초록

소라소분지에 위치한 BP-1공을 대상으로 유기질 미화석 분석 결과와 탄성파 자료를 비교 분석하여 연구지역의 지질시대를 구분하였고 고환경을 해석하였다. 소라소분지에서는 해침 해퇴의 반복과 해수면 변화에 따른 환경변화 및 생물군의 변화가 있었다. 표준화석과 생태층서 해석에 의하여 지질시대는 하부로부터 후기 에오세, 올리고세, 전기 마이오세로 구분하였다. 유기질 미화석군을 기초로 흑진주공의 생태층서를 상부부터 Ecozone III, Ecozone IV, Ecozone V, Ecozone VI 로 각각 4개의 생태층서대로 나누었다. 흑진주공과 기존 연구된 도미분지의 생층서 자료를 비교한 결과, 소라-1공과 인접한 BP-1공에서는 해성층의 미화석 군집의 다양도가 각각 다르게 나타났는데, 이는 각각의 분지 주변과 중앙에 위치한 지형적 차이로 인한 결과로 판단하였다. BP-1공의 층서 연구를 통해 기존의 시추공들과 층서대비를 할 수 있었고 도미분지의 표준층서를 확립하게 되었다.

This study carried out palynological analysis and seismic interpretation to establish a stratigraphic and environmental reconstruction mainly based on fossil palynomorphs and seismic reflection data correlated with the oil exploation well (BP-1) located in the Sora Sub-basin. There were frequent environmental and floral changes due to sea level change in the Sora Sub-basin. The palynomorph assemblages found in the well sediments enabled paleoecological zonation of the well sediment sequence resulting in 4 zones: Ecozone III, Ecozone IV, Ecozone V, Ecozone VI. Index fossils among palynomorphs indicate geological ages of the units within the well ranging from Eocene to Pleistocene, and paleoenvironment varies from freshwater to inner neritic marine. Previous studies suggest that the marine deposits were slightly different in stratigraphic range from well to well. It is considered the difference is credited to geomorphological setting. This study also shows stratigraphic correlation between existing wells and BP-1 well to establishes a standard stratigraphy of the Domi Basin.

키워드

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