Abstract
The Upper Jurassic Diyab Formation is a highly argillaceous dolomitic limestone unit underlying one of the most prolific hydrocarbon reservoirs in the world: the Arab Formation. The Diyab is thought to be the primary source for the Arab in the United Arab Emirates. Thin sections from cores in offshore Abu Dhabi show the Diyab to contain dolomitized grainstones at the base with associated glauconitization and chertification grading upward to olive-green, argillaceous, organically-rich, dolomitic limestones in the upper third of the Diyab, creating a marly texture which persists through to the top of the section. Late diagenetic calcite (and subordinate anhydrite) cement, which include coarse spar as well as blocky and poikilotopic fabrics, occlude much of the secondary porosity and are interpreted to have occurred during burial diagenesis. Dolomite is in the form of euhedral rhombohedra which primarily replace the matrix of the limestones. Allochemical grains, which include peloids, intraclasts and bioclasts, have recrystallized to low Mg-calcite and are partially glauconitized in the lower part of the section. Pressure solution has caused fracturing and stylolitization, fractures being filled by sparry calcite and stylolites by a bituminous residue.
The source rock potential of the Diyab is fair-moderate, with TOC between 0.72 and 1.8%. In western Abu Dhabi the Diyab was a major source rock (TOC of 0.3 to 5.5%) for the Upper Jurassic Arab and Lower Cretaceous Thamama formations.
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References
ABU DHABI NATIONAL OIL COMPANY (ADNOC), 1984, Geochemical studies, source rock determination and migration of oil in the United Arab Emirates: paper presented at the OPEC seminar on source and habitat of petroleum in the Arab countries, Kuwait, p. 7–72.
ALSHARHAN, A. S., 1989, Petroleum geology of the United Arab Emirates:Journal of Petroleum Geology, v. 12, p. 253–288.
ALSHARHAN, A. S. and KENDALL, C. G. St. C., 1986, Precambrian to Jurassic rocks of the Arabian Gulf and adjacent areas: their facies, depositional setting and hydrocarbon habitat:American Association of Petroleum Geologists Bulletin, v. 70, no. 8, p. 977–1002.
ALSHARHAN, A. S. and NAIRN, A. E. M., 1994, Geology and hydrocarbon habitat in the Arabian Basin: the Mesozoic of the State of Qatar:Geologie en Mijnbouw, v. 72, p. 265–294.
ALSHARHAN, A. S. and WHITTLE, G. L., 1995a, Sedimentary-diagenetic interpretation and reservoir characteristics of the Middle Jurassic (Araej Formation) in the southern Arabian Gulf:Journal of Marine and Petroleum Geology, v. 12, p. 615–628.
ALSHARHAN, A. S. and WHITTLE, G. L., 1995b, Carbonate-evaporate sequences of the Late Jurassic, Southern and Southwestern Arabian Gulf:American Association of Petroleum Geologists Bulletin, v. 79, p. 1608–1630.
AYRES, M. G., BILAL, M., JONES, R. W., SLENTZ, L. W., TARTIR, M. and WILSON, A. O., 1982, Hydrocarbon habitat in main producing areas, Saudi Arabia:American Association of Petroleum Geologists Bulletin, v. 66, p. 1–9.
BATHURST, R G. C., 1964, The replacement of aragonite by calcite in the molluscan shell wall, in Imbrie, J. and Newell, N. D. (eds.), Approaches to paleoecology. Wiley, New York, p. 357–376.
BATHURST, R. G. C., 1966, Boring algae, micrite envelopes and lithification of molluscan biosparites:Geological Journal, v. 5, p. 15–32.
DEMATOS, J. E. and HULSTRAND, R. F., 1995, Regional characteristics and depositional sequences of the Oxfordian and Kimmeridgian, Abu Dhabi:Middle East Petroleum Geosciences (Geo ’94) Bahrain, v. 1, p. 346–356.
DROSTE, H., 1990, Depositional cycles and source rock development in an epeiric intra-platform basin: The Hanifa Formation of the Arabian Peninsula:Sedimentary Geology, v. 69, p. 281–296.
FREI, H.P., 1984, Mesozoic source rocks and accumulation in Qatar: OAPEC proceedings of conference on original and migration of Arab oils, Kuwait.
FRIEDMAN, G. M., 1964, Early diagenesis and lithification in carbonate sediments:Journal of Sedimentary Petrology, v. 34, p. 777–813.
FRIEDMAN, G. M., GEBELEIN, C. D. and SANDERS, J. E., 1971, Micrite envelopes of carbonate grains are not exclusively of photosynthetic algal origin:Sedimentology, v. 16, p. 89–96.
HASSAN, T. M. and AZER, S., 1985, The occurrence and origin of oil in offshore Abu Dhabi: Fourth Middle East Oil Show, SPE, Bahrain, p. 143–157.
HESSE, R., 1989, Silica diagenesis: Origin of inorganic and replacement cherts:Earth Science Reviews, v. 26, p. 253–284.
JAMES, N. P. and CHOQUETTE, P. W., 1990, Limestones — the sea floor diagenetic environment, in McIlreath, I.A. and Morrow, D.W. (eds.), Diagenesis, Geoscience Canada Reprint Series No. 4, The Runge Press, Ltd., Ottawa, Ontario, p. 75–112.
KENDALL, C. G. ST. C. and SKIPWITH, P. A., 1969a, Holocene Shallow Water Carbonate and evaporite sediments of Khor Al Bazam, Abu Dhabi, Southwest Persian Gulf:American Association of Petroleum Geologists Bulletin, v. 53, p. 841–869.
KENDALL, C. G. ST. C. and SKIPWITH, P. A., 1969b, Geomorphology of a Recent shallow water carbonate province: Khor al Bazam, Trucial Coast, southwest Persian Gulf:Geological Society America Bulletin, v. 80, p. 865–891.
KENDALL, C. G. ST. C. and SCHLAGER W., 1981, Carbonates and relative changes in sea level:Marine Geology, v. 44, p. 181–212.
KINSMAN, D. J. J., 1964, Recent carbonate sedimentation near Abu Dhabi, Trucial Coast, Persian Gulf: Unpublished Ph.D. Thesis, University of London.
LASCHET, C., 1984, On the origin of cherts:Facies, v. 10, p. 257–290.
LOUTFI, G. and ELBISHLAWY, S., 1986, Habitat of hydrocarbon in Abu Dhabi, U.A.E: Symposium on Hydrocarbon Potential of Intense Thrust Zones, Abu Dhabi, U.A.E. Proceedings, v. II, p. 63–124.
MALIVA, R. G. AND SIEVERS, R., 1989, Cheritification histories of some Late Mesozoic and Middle Paleozoic platform carbonates:Sedimentology, v. 36, p. 907–926.
MURRIS, R. J., 1980, Middle East stratigraphy evolution and oil habitat:American Association of Petroleum Geologists Bulletin, v. 64, p. 597–618.
POWERS, R. W., 1968, Saudi Arabia — Lexique Stratigraphique International: Center Nat. Rch. Scientifique, v. 3, Asie, part 10b, 180 p.
SCHLUMBERGER, 1981, U.A.E. and Qatar: Schlumberger Well Evaluation Conference, 271 p.
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Whittle, G.L., Alsharhan, A.S. Diagenetic history and source rock potential of the Upper Jurassic Diyab Formation, offshore Abu Dhabi, United Arab Emirates. Carbonates Evaporites 11, 145–154 (1996). https://doi.org/10.1007/BF03175632
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DOI: https://doi.org/10.1007/BF03175632