INVESTIGATION OF UNCONVENTIONAL RESERVOIRS OF THE UPPER CRETACEOUS SOURCE ROCKS IN THE HAMEIMAT TROUGH SOUTH EAST SIRTE BASIN, LIBYA
Keywords:
Unconventional reservoirs, Organic geochemistry, Sirte basin, shale oil and gasAbstract
Study area situated in the center of the Hameimat trough which is located in the southeast of the Sirte basin. The Hameimat trough contains two of the largest oil fields in Libya, Gialo and Abu-Attifel fields. The Upper Cretaceous Rachmat, Tagrifet, and Sirte Formations are considered as the main source rock in Sirte Basin,Organic geochemical study of the Upper Cretaceous Rachmat, Tagrifet and Sirte Formations show these Formations have total organic carbon content values of 0.53% to 3.35% fair to excellent as source rock. The Kerogen types are type II and III mixed continental and marine organic matter. The thermal maturity of these formations indicates a mature stage in oil window,Oil saturation index (OSI: S1*100/TOC) shows that Sirte and Rachamt formations have low oil saturation, while the Tagrifet formation has good potential, where OSI exceeds 140 mg HC/g TOC in the most samples of the formation. The Tagrifet formation considers a good unconventional reservoir for shale oil, where the Sirte and Rachmat formations consider possible for shale oil with high risk.
References
D. M. Jarvie, R. J. Hill, T. E. Ruble, and R. M. Pollastro, “Unconventional shale-gas systems: the Mississippian Barnett shale of North-central Texas as one model for thermogenic shale-gas assessment.” The American Association of Petroleum Geologists, vol. 91, no. 4, pp.475-499, 2007.
D. M. Jarvie, “Shale resource systems for oil and gas: part 2 shale-oil resource systems.” The American Association of Petroleum Geologists Memoir 67, pp.89-119, 2012.
K. Dadi, R. Ahmadi, and J. A. Ouali, “ Organic geochemical assessment and shale gas potential of lower Silurian organic rich shale in the Ghadames basin, North Africa.” Estonian Academy Publishers, vol. 36, no. 2, pp.337-352, 2019.
M. El-Alami, “ Habitat of oil in Abu Attiffel area, Sirt Basin, Libya. The geology of the Sirt Basin.” vol. 2, pp. 337-347. Amsterdam: Elsevier, 1996.
R. Burwood, J. Redfern, and M. J. Cope, “ Geochemical evaluation of east Sirte basin (Libya) petroleum systems and oil provenance.” The Geological Society of London, vol. 207, pp.203-240, 2003.
D. Hallett, “ Petroleum Geology of Libya.” Amsterdam: Elsevier, 2002.
D. Hallett, D. C. Lowes, “ Petroleum Geology of Libya.” Amsterdam: Elsevier, 2016.
T. S. Ahlbrandt, “The Sirte Basin Province of Libya—Sirte Zelten Total Petroleum System.” US Department of the Interior. US Geological Survey Bulletin, 2001.
T. Pawellek, “A field guidebook to the geology of sirte basin, Libya.” RWE Dea North Africa / Middle East GmbH, 2007.
A. M. Abadi, J. D. Van Wees, P. M. Van Dijk, and S. A. P. L. Cloetingh, “Tectonics and subsidence evolution of the Sirt Basin, Libya.” The American Association of Petroleum Geologists, vol. 92, no. 8, pp.993-1027, 2008.
A. A. Albaghdady, “Organic geochemical characterization of source rocks (sirt shale) and crude oils from central sirt basin, Libya,” PHD Thesis. University of Oklahoma, Norman, USA, 2013.
Waha Oil Company, Unpublished study. 2005.
K. E. Peters, and M. R. Cassa, “Applied source rock geochemistry. In "The Petroleum System—from source to trap" (L. B. Magoon and W. G. Dow, eds.).” American Association of Petroleum Geologists Memoir 60, 1994.
K. E. Peters, C. C. Walters, and J. M. Moldowan, “The Biomarker Guide, Second edition.” Cambridge University Press. Cambridge, 2005.
R. M. Slatt, “Stratigraphic Reservoir Characterization for Petroleum Geologists, Geophysicists, and Engineers Origin, Recognition, Initiation, and Reservoir Quality.” Amsterdam: Elsevier, 2013.
Z. Jiang, W. Zhang, C. Liang, Y. Wang, H. Liu, and X. Chen, “Basic characteristics and evaluation of shale oil reservoirs.” Chinese Petroleum Society, vol. 2, no. 2016, pp.149-163, 2017.
K. E. Peters, “Guidelines for evaluating petroleum source rock using programmed pyrolysis.” American Association of Petroleum Geologists Bulletin 70, 318-329, 1986.
L. Shuangfang, H. Wenbiao, C. Fangwen, L. Jijun, W. Min, X. Haitao, W. Weiming, and C. Xiyuan, “Classification and evaluation criteria of shale oil and gas resources: Discussion and application.” Research Institute of Petroleum Exploration and Development, PetroChina. Elsevier BV, 2012.
Downloads
Published
Issue
Section
License
Copyright (c) 2024 Journal of Basic Sciences
This work is licensed under a Creative Commons Attribution 4.0 International License.
