Microfacies and Depositional Environment of Mishrif Formation, North Rumaila Oilfield, Southren Iraq (original) (raw)

Abstract

Mishrif Formation is the most significant carbonate reservoir unit in Iraq, it includes up to 30% of total Iraqi oil reserves (Aqrawi et al., 2010). The formation is composed of thick carbonates of middle Cenomanianearly Turonian age (Chatton and Hart, 1961), that deposited on a basin-wide shallow water platform, accommodation space was supplied by a major eustatic seal-level rise in the middle Cenomanian (Haq et al., 1987; Gale et al., 2008). The Mishrif and underlying Rumaila formations were originally described in southern Iraq in well Zb-3 in Zubair oilfield (Aqrawi et al., 2010). The contact between the Mishrif and Rumaila Formations is gradational, the Mishrif Formation is unconformably overlain by the Khasib Formation (Aqrawi 1995). The microfacies of Mishrif Formation were classified based on Folk's (1962) and Dunham's (1962), adjusted by Embry and Klovan (1972) and revised by Wright (1992), this classification is depending on the mud-or grainsupported textural types. 1.1. Study Area North Rumaila oilfield is a giant oil field located in southern Iraq which is approximately 32 Km from Kuwait border and about 50 kilometer west of Basra city, between coordinate 47°16'46''-47°26'14'' Easting and 38°28'34''-38°42'30.8'' Northing. The longitudinal axis of the North Rumaila oilfield is 30 km, while the width is 20 km. It is covered an area about 600 km 2. Zubair, Tuba oilfields located at the east, while West Qurna oilfield located at the north and Ratawi oil field in the west of North Rumaila oilfield, it is consists of subsurface anticlines which are trending N-S (Karim, 1992), it is separated by saddle form south Rumaila oilfield subsurface anticlines (Fig. 1).

Loading...

Loading Preview

Sorry, preview is currently unavailable. You can download the paper by clicking the button above.

References (11)

  1. Al-Ameri, T. K., Pitman, J., Naser, M. E., Zumberge, J., & Al-Haydari, H. A. (2011). Programed oil generation of the Zubair Formation, Southern Iraq oil fields: results from Petromod software modeling and geochemical analysis. Arabian Journal of Geosciences, Vol.4(7-8), pp.1239-1259.
  2. Al-Dabbas, M., Al-Jassim, J., & Al-Jumaily, S. (2010), Depositional environments and porosity distribution in regressive limestone reservoirs of the Mishrif Formation, Southern Iraq, Arabian Journal of Geosciences, vol.3(1), pp. 67-78.
  3. Aqrawi AAM (1995) Brackish-water and evaporitic Ca-Mg carbonates in the Holocene Lacustrine/deltaic deposits of southern Mesopotamia. J Geol Soc Lond 152:259-268.
  4. Aqrawi, A. A., Goff, J. C., Horbury, A. D., & Sadooni, F. N. (2010). The petroleum geology of Iraq. Scientific Press.
  5. Chatton M, Hart E (1961) Review of the Cenomanian to Maastrichtian stratigraphy in Iraq. Manuscript report No. 2/141, INOC Library, Baghdad.
  6. Dunham RJ (1962) Classification of carbonate rocks according to depositional texture. In: Ham WE (ed) Classification of carbonate rocks: American Association of Petroleum Geologists Memoir, pp 108-121.
  7. Embry, A. F., & Klovan, J. E. (1972). Absolute water depth limits of Late Devonian paleoecological zones. Geologische Rundschau, vol.61(2), pp 672-686.
  8. Flugel, E. (2010). Microfacies of carbonate rocks: analysis, interpretation and application. Springer Science & Business Media, Perlin, 984p.
  9. Folk RL (1962) Spectral subdivision of limestone types. In: Ham WE (ed) Classification of Carbonate Rocks-A Symposium:American Association of Petroleum Geologists Memoir 1, pp 62-84.
  10. Karim, H. H. (1992). Structural nature of lower Mesopotamian region from geophysical observations. In Proceeding of 3rd symposium on Oceanography of Khour Al-Zubair, Marine Science Center Basrah, pp. 15-25.
  11. Wright, V. P. (1992). A revised classification of limestones. Sedimentary Geology, vol.76 (3-4), pp 177- 185. Citation: Muslim M. Al-Ali, et.al, (2019)" Microfacies and Depositional Environment of Mishrif Formation, North Rumaila Oilfield, Southren Iraq", Southeast Cameroon, International Journal of Mining Science (IJMS), 5(3), pp.1-10, DOI: http://dx.doi.org/10.20431/2454-9460.0503001