1887
Volume 30, Issue 1
  • ISSN: 1354-0793
  • E-ISSN:

Abstract

More than 20 pinnacle reefs have been discovered in the SE of the Ajdabiya Trough within Paleocene carbonate sediments, most of which are oil-bearing. However, detailed reservoir characterization and conditions governing oil fill-up in this reef have remained unresolved. The major faults provide paths for significant vertical movement of fluids at the edges of the Intisar reef reservoirs. At the same time, the ongoing karst solution collapse also creates vertical zones for fluid encroachment both outside of and within the productive area of the Intisar reef reservoirs. The seismic data show numerous karst-collapse features up to 300 m in diameter that developed shortly after the final drowning of the Intisar ‘B’ and ‘C’ reefs. These karst-collapse features may be the main contributing factor in the escape of hydrocarbons within these reefs, which could explain the high water cuts in the Intisar ‘B’ and ‘C’ reefs. However, the porosity of the southeastern part of the Intisar ‘A’ reef has been significantly improved by fracturing and dissolution, as faults associated with fractures are very common in this part of this reef.

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2024-04-24
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References

  1. Aboaba, O. and Liner, C.2020. Interpretation of Paleozoic paleokarst features in the Arkoma Basin of Oklahoma using 3D seismic and well logs. Interpretation, 8, T421–T440, https://doi.org/10.1190/INT-2019-0155.1
    [Google Scholar]
  2. Ambrose, G.2000. The geology and hydrocarbon habitat of the Sarir Sandstone, SE Sirt Basin, Libya. Journal of Petroleum Geology, 23, 165–191, https://doi.org/10.1111/j.1747-5457.2000.tb00489.x
    [Google Scholar]
  3. Archie, G.E.1942. The electrical resistivity log as an aid in determining some reservoir characteristics. Transactions of the AIME, 146, 54–62, https://doi.org/10.2118/942054-G
    [Google Scholar]
  4. Asheibi, A.M.2023. Seismic-based paleoenvironmental analysis of the Paleocene carbonate shelf in Ajdabiya Trough, north-central of Libya. Bulletin of Canadian Energy Geoscience, 70, 21–52, https://doi.org/10.35767/gscpgbull.70.1.21
    [Google Scholar]
  5. Banerjee, S.1980. Stratigraphic Lexicon of Libya. Department of Geological Research and Mining, Industrial Research of Centre, Tripoli.
    [Google Scholar]
  6. Barr, F.T. and Weegar, A.A.1972. Stratigraphic Nomenclature of the Sirte Basin, Libya. Petroleum Exploration Society of Libya, Tripoli.
    [Google Scholar]
  7. Bögli, A.2012. Karst Hydrology and Physical Speleology. Springer, Berlin.
    [Google Scholar]
  8. Brady, T.J., Campbell, N.D.J. and Maher, C.E.1980. Intisar ‘D’ oil field, Libya. AAPG Memoirs, 30, 543–564.
    [Google Scholar]
  9. Burberry, C.M., Jackson, C.A.-L. and Chandler, S.R.2016. Seismic reflection imaging of karst in the Persian Gulf: implications for the characterization of carbonate reservoirs. AAPG Bulletin, 100, 1561–1584, https://doi.org/10.1306/04151615115
    [Google Scholar]
  10. Burgess, P.M., Winefield, P., Minzoni, M. and Elders, C.2013. Methods for identification of isolated carbonate buildups from seismic reflection data. AAPG Bulletin, 97, 1071–1098, https://doi.org/10.1306/12051212011
    [Google Scholar]
  11. Burk, K. and Dewey, J.F.1974. Two plates in Africa during the Cretaceous?Nature, 249, 313–316, https://doi.org/10.1038/249313a0
    [Google Scholar]
  12. Burwood, R., Cope, M. and Redfern, J.2000. Petroleum system of the Eastern Sirte Basin, Libya. In: Symposium on Petroleum Systems and Evolving Technologies in African Exploration and Production, Abstracts of Meeting of 16–18 May 2000. Petroleum Exploration Society of Great Britain/Geological Society, London, 50–51.
    [Google Scholar]
  13. Cerepi, A., Barde, J.-P. and Labat, N.2003. High-resolution characterization and integrated study of a reservoir formation: the Danian carbonate platform in the Aquitaine Basin (France). Marine and Petroleum Geology, 20, 1161–1183, https://doi.org/10.1016/j.marpetgeo.2003.09.005
    [Google Scholar]
  14. Chi, C.-Y., Mendel, J.M. and Hampson, D.1984. A computationally fast approach to maximum-likelihood deconvolution. Geophysics, 49, 550–565, https://doi.org/10.1190/1.1441690
    [Google Scholar]
  15. Chopra, S. and Marfurt, K.J.2007. Seismic Attributes for Prospect Identification and Reservoir Characterization. SEG Geophysical Developments Series, 11, https://doi.org/10.1190/1.9781560801900.fm
    [Google Scholar]
  16. Conant, L.C. and Goudarzi, G.H.1967. Stratigraphic and tectonic framework of Libya. AAPG Bulletin, 51, 719–730, https://doi.org/10.1306/5D25C0C9-16C1-11D7-8645000102C1865D
    [Google Scholar]
  17. Cooke, D.A. and Schneider, W.A.1983. Generalized linear inversion of reflection seismic data. Geophysics, 48, 665–676, https://doi.org/10.1190/1.1441497
    [Google Scholar]
  18. Culshaw, M.G. and Waltham, A.C.1987. Natural and artificial cavities as ground engineering hazards. Quarterly Journal of Engineering Geology and Hydrology, 20, 139–150, https://doi.org/10.1144/GSL.QJEG.1987.020.02.04
    [Google Scholar]
  19. Davies, G.R. and Smith, L.B., Jr2006. Structurally controlled hydrothermal dolomite reservoir facies: an overview. AAPG Bulletin, 90, 1641–1690, https://doi.org/10.1306/05220605164
    [Google Scholar]
  20. Debeye, H.W.J. and Riel, V.P.1990. Lp-norm deconvolution. Geophysical Prospecting, 38, 381–403, https://doi.org/10.1111/j.1365-2478.1990.tb01852.x
    [Google Scholar]
  21. Dembicki, E.A. and Machel, H.G.1996. Recognition and delineation of paleokarst zones by the use of wireline logs in the bitumen-saturated Upper Devonian Grosmont Formation of northeastern Alberta, Canada. AAPG Bulletin, 80, 695–712, https://doi.org/10.1306/64ED8886-1724-11D7-8645000102C1865D
    [Google Scholar]
  22. Elag, M., Vur, C.T., Sefunc, A. and Sharif, A.2014. Application of seismic attributes and facies modeling to analyze the reservoir characterization in Intisar ‘103A’ Field, Sirt Basin, Libya. Search and Discovery Article #90194, International Conference & Exhibition, 14–17 September 2014, Istanbul, Turkey.
    [Google Scholar]
  23. Finetti, I.1982. Structure, stratigraphy and evolution of central Mediterranean. Bollettino di Geofisica Teorica e Applicata, 14, 247–312.
    [Google Scholar]
  24. Fontaine, J.M., Cussey, R., Lacaze, J., Lanaud, R. and Yapaudjian, L.1987. Seismic interpretation of carbonate depositional environments. AAPG Bulletin, 71, 281–297, https://doi.org/10.1306/94886E7F-1704-11D7-8645000102C1865D
    [Google Scholar]
  25. Ford, D.C.2006. Karst geomorphology, caves and cave deposits: A review of North American contributions during the past half century. Geological Society of America Special Papers, 404, 1–13, https://doi.org/10.1130/2006.2404(01)
    [Google Scholar]
  26. Frumkin, A.2013. Treatise on Geomorphology. Academic Press, San Diego, CA.
    [Google Scholar]
  27. Galloway, E., Hauck, T., Corlett, H., Pană, D. and Schultz, R.2018. Faults and associated karst collapse suggest conduits for fluid flow that influence hydraulic fracturing-induced seismicity. Proceedings of the National Academy of Sciences of the United Staes of America, 115, E10003–E10012, https://doi.org/10.1073/pnas.1807549115
    [Google Scholar]
  28. Gardner, G.H.F., Gardner, L.W. and Gregory, A.R.1974. Formation velocity and density – the diagnostic basics for stratigraphic traps. Geophysics, 39, 770–780, https://doi.org/10.1190/1.1440465
    [Google Scholar]
  29. Gong, F.H. and Liu, X.P.2003. Controlling effects of faults over palaeokarst in west Lungu region, Tarim Basin. Carsologica Sinica, 22, 313–317.
    [Google Scholar]
  30. Gumati, Y.D. and Kanes, W.H.1985. Early Tertiary subsidence and sedimentary facies – northern Sirte Basin, Libya. AAPG Bulletin, 69, 39–52, https://doi.org/10.1306/AD461B83-16F7-11D7-8645000102C1865D
    [Google Scholar]
  31. Hallett, D.2002. Petroleum Geology of Libya. Elsevier, Amsterdam.
    [Google Scholar]
  32. Hallett, D. and Clark-Lowes, D.2016. Petroleum Geology of Libya. 2nd edn. Elsevier, Amsterdam.
    [Google Scholar]
  33. Hallett, D. and El Ghoul, A.1996. Oil and gas potential of the deep trough area in the Sirt Basin, Libya. In: Salem, M.J., El-Hawat, A.S. and Sbeta, A.M. (eds) The Geology of Sirt Basin. Elsevier, Amsterdam, 97–118.
    [Google Scholar]
  34. Harding, T.P.1984. Graben hydrocarbon occurrences and structural style. AAPG Bulletin, 68, 333–362, https://doi.org/10.1306/AD460A21-16F7-11D7-8645000102C1865D
    [Google Scholar]
  35. Hurley, N.F. and Budros, R.1990. Albion–Scipio and Stoney Point fields – USA, Michigan Basin. In: Beaumont, E.A. and Foster, N.H. (eds) Stratigraphic Traps I: Treatise of Petroleum Geology Atlas of Oil and Gas Fields. American Association of Petroleum Geologists (AAPG), Tulsa, OK, 1–37.
    [Google Scholar]
  36. Khatiwada, M., Keller, G.R. and Marfurt, K.J.2013. A window into the Proterozoic: Integrating 3D seismic, gravity, and magnetic data to image subbasement structures in the southeast Fort Worth basin. Interpretation, 1, T125–T141, https://doi.org/10.1190/INT-2013-0041.1
    [Google Scholar]
  37. Klimchouk, A.2009a. Principal features of hypogene speleogenesis. In:Klimchouk, A.B. and Ford, D.C. (eds) Hypogene Speleogenesis and Karst Hydrogeology of Artesian Basins. Ukrainian Institute of Speleology and Karstology, Simferopol, Ukraine, 7–16.
    [Google Scholar]
  38. Klimchouk, A.2009b. Morphogenesis of hypogenic caves. Geomorphology, 106, 100–117, https://doi.org/10.1016/j.geomorph.2008.09.013
    [Google Scholar]
  39. Laubscher, H. and Bernoulli, D.1977. Mediterranean and Tethys. In:Nairn, E.M., Kanes, W.H. and Stehli, F.G. (eds) The Ocean Basins and Margins, Volume 4A. Plenum Press, New York, 1–28.
    [Google Scholar]
  40. Loucks, R.G.1999. Paleocave carbonate reservoirs: Origins, burial-depth modifications, spatial complexity, and reservoir implications. AAPG Bulletin, 83, 1795–1834, https://doi.org/10.1306/E4FD426F-1732-11D7-8645000102C1865D
    [Google Scholar]
  41. Loucks, R.G. and Handford, C.R.1996. Origin and Recognition of Fractures, Breccias and Sediment Fills in Paleocave–Reservoir Networks. West Texas Geological Society Publications, 207–220.
    [Google Scholar]
  42. Loucks, R.G. and Mescher, P.K.2002. Paleocave facies classification and associated pore types. In: Proceedings of the American Association of Petroleum Geologists, Southwest Section, Annual Meeting, Dallas, Texas. American Association of Petroleum Geologists (AAPG), Tulsa, OK, 18.
  43. Mousavi, S.M.A., Shadizadeh, S.R. and Riahi, M.A.2015. NMR log prediction from seismic attributes: Using multiple linear regression and neural network methods. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 37, 781–789, https://doi.org/10.1080/15567036.2011.592914
    [Google Scholar]
  44. Oldenburg, D.W., Scheuer, T. and Levy, S.1983. Recovery of the acoustic impedance from reflection seismograms. Geophysics, 48, 1318–1337, https://doi.org/10.1190/1.1441413
    [Google Scholar]
  45. Palmer, A.N.1991. Origin and morphology of limestone caves. Geological Society of America Bulletin, 103, 1–21, https://doi.org/10.1130/0016-7606(1991)103<0001:OAMOLC>2.3.CO;2
    [Google Scholar]
  46. Pickett, G.R.1973. Pattern recognition as a means of formation evaluation. The Log Analyst, 14, 3–11.
    [Google Scholar]
  47. Pitman, W.C., III and Talwani, M.1972. Sea-floor spreading in the North Atlantic. Geological Society of America Bulletin, 83, 619–646, https://doi.org/10.1130/0016-7606(1972)83[619:SSITNA]2.0.CO;2
    [Google Scholar]
  48. Purdy, E.G. and Waltham, D.1999. Reservoir implications of modern karst topography. AAPG Bulletin, 83, 1774–1793, https://doi.org/10.1306/E4FD4265-1732-11D7-8645000102C1865D
    [Google Scholar]
  49. Rosleff-Soerensen, B., Reuning, L., Back, S. and Kukla, P.2012. Seismic geomorphology and growth architecture of a Miocene barrier reef, Browse Basin, NW-Australia. Marine and Petroleum Geology, 29, 233–254, https://doi.org/10.1016/j.marpetgeo.2010.11.001
    [Google Scholar]
  50. Russell, B. and Toksöz, M.N.1991. 1991 SEG Annual Meeting. Society of Exploration Geophysicists, Houston, TX.
    [Google Scholar]
  51. Simms, M.J.2014. Karst and Paleokarst. In: Reference Module in Earth Systems and Environmental Sciences. Elsevier, Amsterdam, https://doi.org/10.1016/B978-0-12-409548-9.09370-2
    [Google Scholar]
  52. Smith, L.B., Jr2006. Origin and reservoir characteristics of Upper Ordovician Trenton–Black River hydrothermal dolomite reservoirs in New York. AAPG Bulletin, 90, 1691–1718, https://doi.org/10.1306/04260605078
    [Google Scholar]
  53. Spring, D. and Hansen, O.P.1998. The influence of platform morphology and sea level on the development of a carbonate sequence: the Harash Formation, Eastern Sirt Basin, Libya. Geological Society, London, Special Publications, 132, 335–353, https://doi.org/10.1144/GSL.SP.1998.132.01.19
    [Google Scholar]
  54. Story, C., Peng, P., Heubeck, C., Sullivan, C. and Lin, J.D.2000. Liuhua 11-1 Field, South China Sea: A shallow carbonate reservoir developed using ultrahigh-resolution 3-D seismic, inversion, and attribute-based reservoir modeling. The Leading Edge, 19, 834–844, https://doi.org/10.1190/1.1438721
    [Google Scholar]
  55. Taylor, H.L., Banks, S.C. and McCoy, J.F.1979. Deconvolution with the ℓ1 norm. Geophysics, 44, 39–52, https://doi.org/10.1190/1.1440921
    [Google Scholar]
  56. Teillet, T., Fournier, F., Borgomano, J. and Hong, F.2020. Origin of seismic reflections in a carbonate gas field, Lower Miocene, offshore Myanmar. Marine and Petroleum Geology, 113, 104110, https://doi.org/10.1016/j.marpetgeo.2019.104110
    [Google Scholar]
  57. Vahrenkamp, V.C., David, F., Duijndam, P., Newall, M. and Crevello, P.2004. Growth architecture, faulting, and karstification of a middle Miocene carbonate platform, Luconia Province, offshore Sarawak, Malaysia. AAPG Memoirs, 81, 329–350.
  58. Van Houten, F.B.1983. Sirte Basin, north-central Libya: Cretaceous rifting above a fixed mantle hotspot?Geology, 11, 115–118, https://doi.org/10.1130/0091-7613(1983)11<115:SBNLCR>2.0.CO;2
    [Google Scholar]
  59. Veeken, P.C., Priezzhev, I.I., Shmaryan, L.E., Shteyn, Y.I., Barkov, A.Y. and Ampilov, Y.P.2009. Nonlinear multitrace genetic inversion applied on seismic data across the Shtokman field, offshore northern Russia. Geophysics, 74, WCD49–WCD59, https://doi.org/10.1190/1.3223314
    [Google Scholar]
  60. White, R.1997. 1997 SEG Annual Meeting. Society of Exploration Geophysicists, Houston, TX.
    [Google Scholar]
  61. White, R.E. and Hu, T.1998. How accurate can a well tie be?The Leading Edge, 17, 1065–1071, https://doi.org/10.1190/1.1438091
    [Google Scholar]
  62. Wu, X., Yan, S., Qi, J. and Zeng, H.2020. Deep learning for characterizing paleokarst collapse features in 3-D seismic images. Journal of Geophysical Research: Solid Earth, 125, e2020JB019685, https://doi.org/10.1029/2020JB019685
    [Google Scholar]
  63. Yu, J., Li, Z., Yang, L. and Han, Y.2018. Model identification and control of development of deeply buried paleokarst reservoir in the central Tarim Basin, northwest China. Journal of Geophysics and Engineering, 15, 576–592, https://doi.org/10.1088/1742-2140/aa9c00
    [Google Scholar]
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