Palynomorph and palynofacies studies on the lower Miocene succession in the eastern margin of the central trough of Nam Con Son basin

  • Mai Hoang Dam Vietnam Petroleum Institute
  • Nguyen Thi Tham Vietnam Petroleum Institute
  • Nguyen Quang Tuan Vietnam Petroleum Institute
Keywords: Palynomorph, palynofacies, hydrocarbon potential, source rock, Lower Miocene, Nam Con Son basin

Abstract

Palynofacies study in palynology analysis is an interdisciplinary method of research combining stratigraphy, sedimentology and organic geochemistry to determine the depositional environment and assess the source rock potential. This study was caried out on rock samples collected from the Lower Miocene sediments of the CS1 and CS2 wells at the eastern margin of the central trough of the Nam Con Son basin. The aim of the study is (1) to clarify the sedimentary deposition environment in relation to the physicochemical conditions of the organic matter, (2) to evaluate the thermal maturity of the organic matter, and (3) to assess the source rock potential.

The studied results show that three palynofacies were identified, corresponding to four environmental assemblages belonging to shelf marine sediments; the thermal maturity level of organic matter from immature to mature, in which the thermal maturity level of the CS2 well is higher than that of CS1; the hydrocarbon potential of the source rock is oil prone in palynofacies 1 and gas prone in palynofacies 2 and 3.

Palynofacies study is important in the exploratory phase, providing necessary data to evaluate the hydrocarbon potential of the source rock, in addition to the information obtained from the biostratigraphy and sedimentary petrology analysis.

References

Tập đoàn Dầu khí Việt Nam, Địa chất và tài nguyên dầu khí Việt Nam. Nhà xuất bản Khoa học và Kỹ thuật, Hà Nội, 2019.

Mai Hoàng Đảm, Bùi Thị Ngọc Phương, Trương Tuấn Anh, Nguyễn Thị Thanh Ngà, Trần Đức Ninh, Vũ Thị Tuyền, Cao Quốc Hiệp, Nguyễn Văn Sử, Nguyễn Thị Thắm, và Phan Văn Thắng, “Đặc điểm trầm tích Oligocene khu vực Lô 05-1 (a) bể Nam Côn Sơn”, Tạp chí Dầu khí, Số 2, trang 4 - 14, 2021. DOI: 10.47800/PVJ.2021.02-01.

Alfred Traverse, Paleopalynology. Springer, 2007. DOI: 10.1007/978-1-4020-5610-9.

M.F. Whitaker, “Usage of palynostratigraphy and palynofacies in definition of Troll field geology”, Offshore Northern Seas Conference, Stavanger, Norway, 21 August 1984.

Richard V. Tyson, “Palynofacies analysis”, Applied Micropalaeontology, pp. 153 - 191, 1993. DOI: 10.1007/978- 94-017-0763-3_5.

Richard V. Tyson, Sedimentary organic matter: Organic facies and palynofacies analysis. Chapman and Hall, 1995.

M.J. Fisher, P.C. Barnard, and B.S. Cooper, “Organic maturation and hydrocarbon generation in the Mesozoic sediments of the Sverdrup basin, Arctic Canada”, 4th International Palynological Conference, 1980.

D.J. Batten, “Palynofacies, palaeoenvironments and petroleum”, Journal of Micropalaeontology, Vol. 1, pp. 107 - 114, 1982. DOI: 10.1144/jm.1.1.107.

D.L. Pearson, Pollen/spore color “standard”. Phillips Petroleum Company, 1984.

J.E.A. Marshall, “Determination of thermal maturity”, Palaeobiology - A synthesis. Blackwell Scientific Publications, UK, pp. 511 - 515, 1990.

C.J. Van der Zwan, “Palynostratigraphy and palynofacies reconstruction of the Upper Jurassic to lowermost Cretaceous of the Draugen field, offshore Mid Norway”, Review Palaeobotany Palynology, Vol. 62, No. 1 - 2, pp. 157 - 186, 1990. DOI: 10.1016/0034-6667(90)90021-a.

John Utting and Anthony P. Hamblin, “Thermal maturity of the lower carboniferous Horton group, Nova Scotia”, International Journal of Coal Geology, Vol. 19, No. 1 - 4, pp. 439 - 456, 1991. DOI: 10.1016/0166-5162(91)90029-I.

David J. Batten, “Palynofacies and petroleum potential”, Palynology: Principles and Applications, American Association of Stratigraphic Palynologists Foundatio, Dallas, pp. 1065 - 1084, 1996.

Christoph Hartkopf-Fröder, Peter Königshof, Ralf Littke, and Jan Schwarzbauer, “Optical thermal maturity parameters and organic geochemical alteration at low grade diagenesis to anchimetamorphism: A review”, International Journal of Coal Geology, Vol. 150 - 151, pp. 74 - 119, 2015. DOI: 10.1016/j.coal.2015.06.005.

Lisa A. Levin, “Oxygen minimum zone benthos: Adaptation and community response to hypoxia”, Oceanography and Marine Biology: An annual review 2, Vol .41, pp. 1 - 45, 2003.

Viện Dầu khí Việt Nam, “Báo cáo sinh địa tầng giếng khoan CS1 và CS2 bể Nam Côn Sơn”.

Wallace G. Dow, “Kerogen studies and geological interpretations”, Journal of Geochemical Exploration, Vol. 7, pp. 79 - 99, 1977. DOI: 10.1016/0375-6742(77)90078-4.

D.A. Leckie, W.D. Kalkreuth, and L.R. Snowdon, “Source rock potential and thermal maturity of Lower Cretaceous strata: Monkman Pass area, British Columbia”, AAPG Bulletin, Vol. 7, No. 7, pp. 820 - 838, 1988. DOI: 10.1306/703C8F38-1707-11D7-8645000102C1865D.

Nguyễn Thị Oanh Vũ, Nguyễn Thị Tuyết Lan, Phan Văn Thắng, và Nguyễn Thị Thanh Ngà, “Đặc điểm địa hóa đá mẹ khu vực các giếng nước sâu bể Nam Côn Sơn và Tư Chính - Vũng Mây”, Tạp chí Dầu khí, Số 8, trang 26 - 33, 2020

Published
2021-09-30
How to Cite
Hoang Dam, M., Thi Tham, N., & Quang Tuan, N. (2021). Palynomorph and palynofacies studies on the lower Miocene succession in the eastern margin of the central trough of Nam Con Son basin. Petrovietnam Journal, 9, 4-12. https://doi.org/10.47800/PVJ.2021.09-01
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Articles