Modeling of Hydrocarbon Generation and Expulsion in the Tyee Basin, Oregon Coast Range, USA

미국 북서부 오레곤주 타이분지 내 탄화수소 생성과 배출에 대한 모델링 연구

  • Jang, Hee-Jeong (Department of Geology, Kyungpook National University) ;
  • Ryu, In-Chang (Department of Geology, Kyungpook National University)
  • Published : 2009.02.28


The timing of hydrocarbon generation and expulsion from source rocks can be evaluated by reconstructing the geohistory of the basin using petroleum system modeling. The Tyee basin is generally considered having a high hydrocarbon generation potential For the southern part of the basin, the basin evolution from a structural and stratigraphic points of view, the thermal history, and the burial history were reconstructed and simulated using numerical tools of basin modeling. An evaluation of organic geochemistry for the potential source rocks and the possible petroleum systems were analysed to improve the understanding of the hydrocarbon charge of the basin. Organic geochemical data indicate that the undifferentiated Umpqua Group, mudstones of the Klamath Mountains, and coals and carbonaceous mudstones in the Remote Member and the Coquille River Member are the most potential gas-prone source rocks in the basin. The relatively high maturity of the southern Tyee basin is related to deep burial resulting from loading by the Coos bay strata. And the heating by intrusion from the western Cascade arc also affects to the high maturity of the basin. The maturation of source rocks, the hydrocarbon generation and expulsion were evaluated by means of basin modeling. The modeling results reveal that the hydrocarbon was generated in all potential source rocks and an expulsion only occurred from the Remote Member.

근원암으로부터 탄화수소가 생성되고 배출되는 시기는 석유시스템 모델링을 이용하여 분지의 지사를 복원함으로써 평가할 수 있다. 미국 북서부 오레곤주에 위치한 타이분지는 탄화수소 생성 가능성이 높은 지역이다. 본 연구에서는 남부타이분지에 대한 구조 층서적 관점에서의 분지 진화와 열역사 및 매몰사를 석유시스템 모델링의 수치모델을 사용하여 복원, 시뮬레이션 하였다. 분지 내 탄화수소 생성과 배출을 이해하기 위해 잠재 근원암에 대한 유기 지화학적 평가와 가능한 석유시스템을 분석하였다. 유기 지화학 자료를 통해 미분화된 움콰 그룹, 클라마스산의 이암층, Remote Member와 Coquille River Member에 협재된 탄층과 탄질 이암이 분지 내 가스를 생성시킬 수 있는 잠재력이 큰 근원암임을 알 수 있다. 남부 타이분지의 상대적으로 높은 열적 성숙도가 쿠스베이 퇴적층의 하중 압력에 의한 매몰과 연관됨을 지시하여 준다. 서부 캐스케이드흐로부터 관입에 의한 열 유입 또한 분지의 높은 열적 성숙도에 영향을 미친다. 이러한 분석을 바탕으로 근원암의 성숙과 탄화수소 생성, 및 배출이 석유시스템 모델을 통해 평가되어졌다. 모델링 결과는 모든 잠재 근원암으로부터 탄화수소가 생성은 되었으나 오직 Remote Member에서만 배출이 일어났음을 알려준다.



  1. Allen, P.A. and Allen, J.R. (1990) Basin analysis: principles and applications. Blackwell Scientific Publications, London, 301p
  2. Amoco Production Company (1983) Source rock evaluation: Eocene cuttings, Florida Exploration No. 1-4 Harris well, Douglas County, Oregon. Amoco Production Company Internal Report
  3. Amoco Production Company (1985) Oil correlation evaluation: Drilling mud analysis, Amoco No. B-1 Weyerhaeuser well, Douglas County, Oregon. Amoco Production Company Internal Report
  4. Armentrout, J.M. and Suek, D.H. (1985) Hydrocarbon exploration in western Oregon and Washington. American Association of Petroleum Geologists Bulletin, v. 69, p. 627-643
  5. Baldwin, E.M. and Perttu, R.D. (1980) Paleogene stratigraphy and structure along the Klamath borderland, Oregon; in Oles, G.F., Johnson, J.G., Niem, A.R. and Niem, W.A., (eds.) Geologic field trips in western Oregon and southwestern Washington. Oregon Dept. of Geology and Mineral Industries Bulletin 101, p. 9-37
  6. Blackwell, D.D., Bowen, R.G., Hull, D.A. and Riccio, J. (1982) Heat flow, arc volcanism, and subduction in Northern Oregon. Journal of Geophysical Research, v. 87, no. B10, p. 8735-8754
  7. Blackwell, D.D. and Steele, J.L. (1992) Geothermal Map of North America: Decade of North American Geology, DNAG, Continent-Scale Map-006. Geological Society of America, Boulder, CO
  8. Browning, J.L. and Flanagan, T. (1980) Source rock study of the lower Tertiary formations of southwestern Oregon. Unpublished reports on file in offices of Oregon Department of Geology and Mineral Industries
  9. Brown and Ruth Laboratories Incorporation (1983) Regional petroleum geochemistry of the onshore and offshore sediments of Washington and Oregon: Geochemical reports on General Petroleum Long Bell No. 1, Sutherlin Unit No. 1, and Amoco Weyerhaeuser F-1 wells. Unpublished reports on file in offices of Oregon Department of Geology and Mineral Industries
  10. Chan, M.A. and Dott, R.H., Jr. (1983) Shelf and deep-sea sedimentation in Eocene forearc basin, western Oregon - fan or non-fan?. American Association of Petroleum Geologists Bulletin, v. 67, p. 2100-2116
  11. Dow, W.G. (1977) Kerogen studies and geological interpretation. Journal of Geochemical Exploration, v. 7, p. 77-99
  12. Falvey, D.A. and Middleton, M.F. (1981) Passive continental margins: Evidence for a prebreakup deep crustal metamorphic subsidence mechanism. Oceanologic Acta Special Publication, p. 103-114
  13. Heller, P.L. and Ryberg, P.T. (1983) Sedimentary record of subduction to forearc transition in the rotated Eocene basin of western Oregon. Geology, v. 11, p. 380-383<380:SROSTF>2.0.CO;2
  14. Law, B.E., Anders, D.E., Fouch, T.D., Pawlewicz, M.J., Lickus, M.R. and Molenaar, C.M. (1984) Petroleum source rock evaluation of outcrop samples from Oregon and northern California. Oregon Geology, v. 46, p. 77-81
  15. Lee, B.R. (2008) Petroleum system modeling of continental shelf area, southwestern margin of the Ulleung basin, East Sea. Master Thesis, University of Science and Technology, 75p
  16. Magoon, L.B. and Dow, W.G. (1994) The petroleum system from source to trap. American Association of Petroleum Geologists Memoir 60, p. 3-24
  17. Mobil Oil Corporation (1980) Source rock data on Map of southwest Oregon. Mobil internal report
  18. Molenaar, C.M. (1985) Depositional relations of Umpqua and Tyee Formations (Eocene), Southwestern Oregon. American Association of Petroleum Geologists Bulletin, v. 69, p. 1217-1229
  19. Newton, Jr. V.C. (1980) Prospects for oil and gas in the Coos basin, western Coos, Douglas, and Lane counties, Oregon. Oregon Department of Geology and Mineral Industries Oil and Gas Investigation 6
  20. Niem, A.R. and Niem, W.A. (1990) Geology and oil, gas, and coal resources, southern Tyee basin, southern Coast Range, Oregon. Oregon Department of Geology and Mineral Industries, Open-File Report O-89-3
  21. Niem, W.A., Niem, A.R. and Snavely, P.D., Jr. (1992) Early and Mid-Tertiary oceanic realm and continental Margin - western Washington-Oregon coastal sequence; in Burchfiel, B.C., Lipman, P.W., and Zoback, M.L., eds., The Cordilleran Orogen. Conterminous U.S.: Geological Society of America, v. G-3, p. 265-270
  22. Ryu, I.C., Niem, A.R. and Niem, W.A. (1992) Schematic fence diagram of the southern Tyee basin, Oregon Coast Range, showing stratigraphic relationshipsof exploration wells to surface measured sections. Oregon Department of Geology and Mineral Industries Oil and Gas Investigation 18, p. 28
  23. Ryu, I.C., Niem, A.R. and Niem, W.A. (1996) Oil and gas evaluation of the southern Tyee basin, Oregon Coast Range. Oregon Department of Geology and Mineral Industries Oil and Gas Investigation 19, p. 141
  24. Ryu, I.C. (2008) Source rock characterization and petroleum systems of Eocene Tyee basin, southern Oregon Coast Range, USA. Organic Geochemistry, v. 39, p. 75-90
  25. Snavely, P.D., Jr., Wagner, H.C. and MacLeod, N.S. (1964) Rhythmic-bedded eugeosynclinal deposits of the Tyee Formation, Oregon Coast Range. Kansas Geological Survey Bulletin, v. 169, p. 461-480
  26. Snavely, P.D., Jr., MacLeod, N.S. and Wagner, H.C. (1968) Tholeiitic and alkalic basalts of the Eocene Siletz River Volcanics, Oregon Coast Range. American Journal of Science, v. 266, p. 454-481
  27. Snavely, P.D., Jr. (1987) Tertiary geologic framework, neotectonics, and petroleum potential of the Oregon- Washington continental Margin; in Scholl, D.W., Grantz, A., and Vedder, F.G., (eds.) Geology and resource potential of the continental Margin of western north America and adjacent ocean basins - Beaufort Sea to Baja California. Circum-Pacific Council for Energy and Mineral Resources Earth Science Series, v. 6, p. 305-335
  28. Sweeney, J.J. and Burnham, A.D. (1990) Evaluation of a simple model of vitrinite reflectance based on chemical kinetics. American Association of Petroleum Geologists Bulletin, v. 74, p. 1559-1570
  29. Tissot, B.P. and Welte, D.H. (1978) Petroleum Formation and Occurrence. Springer, New York. 538p
  30. Walker, G.W. and MacLeod, M.S. (1991) Geologic map of Oregon. U.S. Geological Survey, scale 1:1,500,000
  31. Waples, D.W., Kamata, H. and Suizu, M. (1992) The art of maturity modeling, part 1: finding a satisfactory geologic model. American Association of Petroleum Geologists Bulletin, v. 76, p. 31-46
  32. Waples, D.W. and Marz, R.W. (1998) The universality of the relationship between vitrinite reflectance and transformation ratio. Organic Geochemistry, v. 28, p. 383-388
  33. Wells, R.E., Engebretson, D.C., Snavely, Jr., P.D. and Coe, R.S. (1984) Cenozoic plate motions and the volcanotectonic evolution of western Oregon and Washington. Tectonics, v. 3, p. 275-294
  34. Wells, R.E. and Heller, P.L. (1988) The relative contribution of accretion, shear, and extension to Cenozoic tectonic rotation in the Pacific northwest. Geological Society of America Bulletin, v. 100, p. 325-338<0325:TRCOAS>2.3.CO;2
  35. Welte, D.H. and Yalcin, M.N. (1987) Basin modelling - A new comprehensive method in petroleum geology. Advances in Organic Geochemistry, v. 13, p. 141-151