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2011 Vol.48, Issue 3 Preview Page
30 June 2011. pp. 371-382
Abstract
Marcellus Shale is an unconventional resources and is distributed over 140,000 km2 in the Appalachian Basin. This shale contains about 300∼1,500 TCF of natural gas in place. The Appalachian Basin is a foreland basin, and is characterized by alternating deposits of shale and siltstone resulting from fluctuation of sediment supply and water depth according to intermittent crustal loading. The shale was deposited by turbidity currents or by settling of suspended mud when sediment supply was scant due to disturbance of the drainage system by crustal loading. Increasing pore-water pressure and generation of gas with subsidence make fractures parallel to tectonic stress associated with collision between Gondwana and Laurentia plates. Horizontal drilling is recommended to produce gas from the shale than vertical one, because it can crosscut many pre-existing fractures. Water demand for the horizontal drilling and the hydrofracturing is increasing with the increase in gas production. Water is available from development of ground water, use of recycled water, and purification of waste water. To mitigate environmental pollutions, construction of waste water purification system and drilling of horizontal well are necessary.
마르셀러스 셰일은 신석유가스자원으로서, 미국 북동부 애팔래치아 분지 내 140,000 km2 면적에 걸쳐 분포하며 원시부존량이 약 300∼1,500 TCF에 달한다. 애팔래치아 분지는 융기대 전면분지로, 간헐적인 스러스트 하중에 의한 퇴적물 공급량 및 수심의 변화로 흑색셰일 및 실트가 교호하는 것이 특징이다. 셰일은 스러스트 하중에 의한 하천의 교란으로 인해 퇴적물의 공급량이 적을 때, 저탁류 또는 부유퇴적물의 침전에 의해 퇴적되었다. 퇴적 후 분지의 침강에 따라 형성된 가스와 공극수압으로 인해 균열이 형성되었고, 이는 로렌시아-곤드와나판의 충돌에 따른 응력배열에 평행하게 발달하였다. 셰일로부터 가스를 회수하기 위해서는 이러한 균열을 많이 횡절할 수 있는 수평시추가 유리하다. 마르셀러스 셰일에 대한 생산이 늘어남에 따라 수평시추 및 수압파쇄에 사용되는 용수의 수요가 증가한다. 지하수의 개발과 용수재처리, 인접광산의 폐수처리 등을 통해 수평시추 및 수압파쇄를 위한 용수를 확보할 수 있다. 또한 가스 생산과 관련된 여러 환경오염에 의한 피해를 줄이기 위해 수평시추 및 폐수 처리시설 건설이 필요하다.
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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 for Geosystem Engineering
  • Journal Title(Ko) :한국지구시스템공학회지
  • Volume : 48
  • No :3
  • Pages :371-382