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2014 Vol.51, Issue 5 Preview Page

Review

31 October 2014. pp. 729-749
Abstract
Brief review of the Brown Dense shale oil/gas system of the U.S. is provided. Brown Dense is informally named for organic-rich, brown and dense, cryptocrystalline carbonate that comprises the lower part of the Smackover Formation. It is well known as the principal source rock of the Gulf Coast. In north Louisiana, it lies at depths of 2,438~3,353 m, and is 91~168 m thick. The mean total organic content is only about 0.5%, because much of the original organic matter has converted to oil and gas. Oils show characteristics indicative of marine algal-hypersaline-anoxic-carbonate sourced nature. Thermal maturity of the Brown Dense shale in northeast Louisiana is relatively low due to the Monroe uplift, and oil and gas generation through thermal cracking of kerogen is minimal. Thus, oil and gas being produced in this area might have migrated from elsewhere with better thermal maturation. The Brown Dense shale oil/gas system in north Louisiana appears to be a tight play rather than a resource play.
최근 미국에서 새롭게 부상한 비재래, 브라운 덴스 셰일 오일/가스 시스템에 대해 고찰하였다. 브라운 덴스는 스맥오버 층 하부의 유기물이 풍부한 갈색의 치밀한 은미정질 탄산염암으로, 걸프 연안에서 생산된 석유・가스의 주 근원암이다. 루이지애나 주 북부에서 브라운 덴스 멤버는 2,438~3,353 m 깊이에 분포하며, 두께는 91~168 m이다. 유기물은 조류 기원-고염수-무산소-탄산염암 근원의 특성을 보이며, 평균 함량이 0.5%로 낮은데. 이는 상당 부분이 이미 석유와 가스로 변환되어 소진되었기 때문이다. 루이지애나 주 북동부의 유기물은 먼로 융기의 영향을 받아 낮은 성숙 단계에 머물고 있으며, 석유・가스로의 전환도 미미하다. 따라서, 이 지역에서 산출되는 석유・가스의 대부분은 유기물 속성 단계가 높은 다른 지역으로부터 이동해 왔을 것으로 추정되며, 탐사・개발도 근원암으로보다는 치밀암 개념으로 접근해야 할 것으로 보인다.
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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 : 51
  • No :5
  • Pages :729-749