Advertisement

Carbonates and Evaporites

, Volume 9, Issue 1, pp 42–57 | Cite as

Dolomitization and H2S generation in the Permian Khuff Formation, Offshore Dubai, U.A.E.

  • Patricia E. Videtich
Article

Abstract

Dolomite in the Permian Khuff Formation from the T-1 well (Fateh field, offshore Dubai, United Arab Emirates) formed during the Miocene from a dense brine at a depth of approximately 15,500 ft (4,724 m), as indicated by fluid inclusion data. As the majority of the porosity is intercrystalline, most of the porosity formed at the same time. Fluid inclusion data, together with petrography, luminescence, and oxygen and carbon stable isotopes, indicate the diagenetic history was extremely complex with multiple episodes of precipitation of cements (calcite, saddle dolomite, anhydrite, fluorite), but fluid inclusion geothermometry data indicate that the majority of cementation occurred from the Eocene to the Miocene at depths of at least 12,300 ft (3,749 m). The matrix dolomite, anhydrite nodules, and calcite and fluorite cements have higher87Sr/86Sr ratios (0.70780 to 0.71084) than expected for late Permian seawater, which supports a non marine (burial) origin. Anhydrite with higher than expected δ34S (16.5 to 20.2o/oo CDT) for late Permian seawater gives supporting evidence for this interpretation.

Gas from the T-1 well contains 38% H2S. As suggested by the great depth (almost 15,000 ft or 4,572 m) and calculated temperature of the Khuff reservoir, the H2S probably formed by a thermochemical reaction involving the reduction of some of the abundant anhydrite by methane to various products including H2S and calcite. δ13S of calcite cements as light as_-28.5o/oo PDB support this interpretation.

Keywords

Calcite Dolomite Fluid Inclusion Anhydrite 87Sr 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. ALSHARHAN, A.S., and KENDALL, C.G.ST., 1986, Precambrian to Jurassic rocks of Arabian Gulf and adjacent areas: their facies, depositional setting, and hydrocarbon habitat: Am. Assoc. Petrol. Geol. Bull., v. 70, p. 977–1002.Google Scholar
  2. BANNER, J.L., HANSON, G.N., and MEYERS, W.J., 1988, Determination of initial Sr isotopic compositions of dolostones from the Burlington Keokuk Formation (Mississippian): constraints from cathodoluminescence, glauconite paragenesis and analytical methods: Jour. Sedimentary Petrology, v. 58, p. 673–687.CrossRefGoogle Scholar
  3. BERNER, R.A., 1981, Authigenic mineral formation resulting from organic matter decomposition in modern sediments: Fortschr. Miner., v. 59, p. 117–135.Google Scholar
  4. BLAKE, D.F., PEACOR, D.R., and WILKINSON, B.H., 1982, The sequence and mechanism of low-temperature dolomite formation: calcian dolomites in a Pennsylvanian echinoderm: Jour. Sedimentary Petrology, v. 52, p. 59–70.Google Scholar
  5. BURKE, W.H., DENISON, R.E., HETHERINGTON, E.A., KOEPNICK, R.B., NELSON, H.F., and OTTO, J.B., 1982, Variation of seawater87Sr/86Sr throughout Phanerozoic time: Geology, v. 10, p. 516–519.CrossRefGoogle Scholar
  6. BUTLER G.P., KROUSE, R.H., and MITCHELL, R., 1973, Sulphur-isotope geochemistry of an arid supratidal evaporite environment, Trucial Coast, in Purser, B.H., ed., The Persian Gulf, Holocene Carbonate Sedimentation and Diagenesis in a Shallow Epicontinental Sea. Springer-Verlag, New York, p. 453–471.Google Scholar
  7. CIE, 1931, International Commission on Illumination: Proceedings of the Eighth Session, Cambridge, England, Bureau Central de la CIE, Paris.Google Scholar
  8. CLAYPOOL, G.E., HOLSER, W.T., KAPLAN, I.R., SAKAI, H., and ZAK, I., 1980, The age curves of sulfur and oxygen isotopes in marine sulfate and their mutual interpretation: Chemical Geology, v. 28, p. 199–260.CrossRefGoogle Scholar
  9. CRAIG, H., 1957, Isotopic standards for carbon and oxygen and correction factors for mass spectrometric analyses of carbon dioxide: Geochim. Cosmochim. Acta, v. 12, p. 133–149.CrossRefGoogle Scholar
  10. DAWSON, W.C., and CAROZZI, A.V., 1993, Experimental deep burial, fabric selective dissolution in Pennsylvanian phylloid algal limestones: Carbonates and Evaporites, v. 8, p. 71–81.CrossRefGoogle Scholar
  11. DINUR, D., SPIRO, B., and AIZENSHTAT, Z., 1980, The distribution and isotopic composition of sulfur in organic-rich sedimentary rocks: Chemical Geology, v. 31, p. 37–51.CrossRefGoogle Scholar
  12. DONATH, F.A., CAROZZI, A.V., FRUTH, L.S., Jr., and RICH, D.W., 1980, Oomoldic porosity experimentally developed in Mississippian oolitic limestone: Jour. Sedimentary Petrology, v. 50, p. 1249–1260.Google Scholar
  13. DONOVAN, T.J., FRIEDMAN, I., and GLEASON, J.D., 1974, Recognition of petroleum-bearing traps by unusual isotopic compositions of carbonate-cemented surface rocks: Geology, v. 2, p. 351–354.CrossRefGoogle Scholar
  14. DRUCKMAN, Y., and MOORE, C.H., 1985, Late subsurface secondary porosity in a Jurassic grainstone reservoir, Smackover Formation, Mt. Vernon field, southern Arkansas, in Roehl, P.O., and Choquette, P.W., eds., Carbonate Petroleum Reservoirs. Springer-Verlag, New York, p. 369–383.CrossRefGoogle Scholar
  15. FEELY, H.W., and KULP, J.L., 1957, Origin of Gulf Coast salt-dome sulphur deposits: Am. Assoc. Petrol. Geol. Bull., v. 41, p. 1802–1853.Google Scholar
  16. GAINES, A.M., 1977, Protodolomite redefined: Jour. Sedimentary Petrology, v. 47, p. 543–546.Google Scholar
  17. GOLDSMITH, J.R., and GRAF, D.L., 1958, Structural and compositonal variations in some natural dolomites: Jour. Geology, v. 66, p. 678–693.CrossRefGoogle Scholar
  18. HEMMING, N.G., MEYERS, W.J., and GRAMS, J.C., 1989, Cathodoluminescence in diagenetic calcites: the roles of Fe and Mn as deduced from electron probe and spectrophotometric measurements: Jour. Sedimentary Petrology, v. 59, p. 404–411.Google Scholar
  19. JARDINE, D., ANDREWS, D.P., WISHART, J.W., and TORING, J.W., 1977, Distribution and continuity of carbonate reservoirs: Jour. Petroleum Technology, v. 29, p. 873–885.CrossRefGoogle Scholar
  20. JENSEN, M.L., and NAKAI, N., 1962, Sulfur isotope meteorite standards, results and recommendations, in Jensen, M.L., ed., Biogeochemistry of Sulfur Isotopes, Proceedings of a National Science Foundation Symposium, April 12–14, Yale University, p. 30–35.Google Scholar
  21. KIRTLAND, D.W., and EVANS, R., 1976, Origin of limestone buttes, Gypsum Plain, Culberson County, Texas: Am. Assoc. Petrol. Geol. Bull., v. 60, p. 2005–2018.Google Scholar
  22. KROUSE, H.R., 1977, Sulfur isotope studies and their role in petroleum exploration: Jour. Geochemical Exploration, v. 7, p. 189–211.CrossRefGoogle Scholar
  23. MACHEL, H.-G., 1987a, Saddle dolomite as a by-product of chemical compaction and theromchemical sulfate reduction: Geology, v. 15, p. 936–940.CrossRefGoogle Scholar
  24. MACHEL, H.-G., 1987b, Some aspects of diagenetic sulphate-hydrocarbon redox reactions, in Marshall, J.D., ed., Diagenesis of Sedimentary Sequences, Geological Society Special Publication, No. 36, p. 15–28.Google Scholar
  25. MCLIMANS, R.K., 1987, The application of fluid inclusions to migration of oil and diagenesis in petroleum reservoirs: Applied Geochemistry, v. 2, p. 585–603.CrossRefGoogle Scholar
  26. MURRAY, R.C., 1960, Origin of porosity in carbonate rocks: Jour. Sedimentary Petrology, v. 30, p. 59–84.Google Scholar
  27. OHMOTO, H., and RYE, R.O., 1979, Isotopes of sulfur and carbon, in Barnes, H.L., ed., Geochemistry of Hydrothermal Ore Deposits. John Wiley & Sons, New York, p. 509–567.Google Scholar
  28. ORR, W.L., 1974, Changes in sulfur content and isotopic ratios of sulfur during petroleum maturation—study of Big Horn Basin Paleozoic oils: Am. Assoc. Petrol. Geol. Bull., v. 58, p. 2295–2318.Google Scholar
  29. ORR, W.L., 1975, Geologic and geochemical controls on the distribution of hydrogen sulfide in natural gas, in Campos, R. and Goni, J., eds., Advances in Organic Geochemistry, Proceedings of the 7th International Meeting on Organic Geochemistry, Madrid, Spain, p. 571–597.Google Scholar
  30. PIERRE, C., 1988, Applications of stable isotope geochemistry to the study of evaporites, in Schreiber, B.C., ed., Evaporites and Hydrocarbons. Columbia University Press, New York, p. 300–344.CrossRefGoogle Scholar
  31. POPP, B.N., PODOSEK, F.A., BRANNON, J.C., ANDERSON, T.F., and PIER, J., 1986,87Sr/86Sr ratios in Permo-Carboniferous sea water from the analyses of well-preserved brachiopod shells: Geochim. Cosmochim. Acta, v. 50, p. 1321–1328.CrossRefGoogle Scholar
  32. RADKE, B.M., and MATHIS, R.L., 1980, On the formation and occurrence of saddle dolomite: Jour. Sedimentary Petrology, v. 50, p. 1149–1168.Google Scholar
  33. ROEDDER, E., 1984, Fluid Inclusions: Reviews in Mineralogy, v. 12, Chelsea, MI, Bookcrafters, Inc., 644 p.CrossRefGoogle Scholar
  34. SAMHOURI, F.A., and AL-CHALABI, A.M., 1985, ADCO improves deep Khuff drilling: Oil and Gas Jour., v. 83, January 7, p. 73–78.Google Scholar
  35. SCHMOKER, J.W., and HALLEY, R.B., 1982, Carbonate porosity versus depth: a predictable relation for South Florida: Am. Assoc. Petrol. Geol. Bull., v. 66, p. 2561–2570.Google Scholar
  36. SCHMOKER, J.W., KRYSTINIK, K.B., and HALLEY, R.B., 1985, Selected characteristics of limestones and dolomite reservoirs in the United States: Am. Assoc. Petrol. Geol. Bull., v. 69, p. 733–741.Google Scholar
  37. SIEBERT, R.M., 1985, The origin of hydrogen sulfide, elemental sulfur, carbon dioxide, and nitrogen in reservoirs, in Timing of Siliciclastic Diagenesis: Relationship to Hydrocarbon Migration. Sixth Annual Research Conference, Gulf Coast Section, Society of Economic Paleontologists and Mineralogist Foundation, Program and Abstracts, p. 30–31.Google Scholar
  38. TRUDINGER, P.A., CHAMBERS, L.A., and SMITH, J.W., 1985, Low-temperature sulphate reduction: biological versus abiological: Can. Jour. Earth Sci., v. 22, p. 1910–1918.CrossRefGoogle Scholar
  39. VEIZER, J., and COMPSTON, W., 1974,87Sr/86Sr composition of seawater during the Phenerozoic: Geochim. Cosmochim. Acta, v. 38, p. 1461–1484.CrossRefGoogle Scholar

Copyright information

© Springer 1994

Authors and Affiliations

  • Patricia E. Videtich
    • 1
  1. 1.Department of GeologyGrand Valley State UniversityAllendale

Personalised recommendations