The Pores Types, Genesis and Its Relationship with Reservoir Characteristics of Carbonate: Examples from Cretaceous Mishrif Formation Carbonate of West Qurna Oilfiled, Iraq

  • Hangyu LiuEmail author
  • Zhongyuan Tian
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)


To classify pores and analyze pores genesis, make sense of the relationship between pore types and reservoir characteristics of carbonate. This study takes the Cretaceous Mishrif formation carbonate in West Qurna oilfield, Iraq, as examples. By means of thin section, physical properties, and mercury injection test of 421 samples, pores are classified as intraparticle, moldic, residual moldic, interparticle, micropore, and intercrystalline pore. According to dominated pore types, samples can be classified into six classes. They are classes of residual moldic, intraparticle, micropore, moldic, mixed pore, and interparticle pore. The pores genesis is controlled by sedimentary environment and diagenesis. Pore types are determined by lime mud contents, bioclastic textures, types and abundance, and the latter were controlled by sedimentary environments. The pores generation is mainly dominated by dissolution, which is influenced by mineralogy composition of bioclastic. Besides, pores were altered by micritization, cementation, and compaction. It is found that the dominated pore types are closely related to reservoir characteristics. Each class of samples corresponds to two or more rock types and bioclastic types, while the physical properties and pore structure are similar, respectively, which reveal that pore types are a key factor of strong heterogeneity.


West Qurna oilfield Mishrif formation Carbonate reservoir Pore types Pore structure Pores genesis 



Funding from the special and significant project of national science and technology “Key technology research and application of water-flooding development of giant bioclastic limestone reservoirs in Iraq” (No. 2017ZX05030-001) is gratefully acknowledged.


  1. 1.
    Ahr WM (2011) Geology of carbonate reservoirs. Wiley Press, pp 277–278Google Scholar
  2. 2.
    Jia C (2012) Petroleum geology of carbonate reservoir. Springer, Berlin, pp 2–5Google Scholar
  3. 3.
    Flügel E, Munnecke A (2004) Microfacies of carbonate rocks: analysis, interpretation and application. Springer, Berlin, pp 843–859CrossRefGoogle Scholar
  4. 4.
    Moore CH, Wade WJ (2013) Carbonate reservoirs: porosity and diagenesis in a sequence stratigraphic framework. Elsevier Press, Amsterdam, pp 214–224Google Scholar
  5. 5.
    James NP, Jones B (2016) Origin of carbonate sedimentary rocks. Wiley, Chichester, p 446Google Scholar
  6. 6.
    Choquette PA, Pray LC (1970) Geologic nomenclature and classification of porosity in sedimentary carbonate. AAPG Bull 54(2):207–250Google Scholar
  7. 7.
    Archie GE (1952) Classification of carbonate reservoir rocks and petrophysical considerations. AAPG Bull 36(2):278–298Google Scholar
  8. 8.
    Lucia FJ (1983) Petrophysical parameters estimated from visual descriptions of carbonate rocks: a field classification of carbonate pore space. J Petrol Technol 35(3):629–637CrossRefGoogle Scholar
  9. 9.
    Lucia FJ (1995) Rock-fabric/petrophysical classification of carbonate pore space for reservoir characterization. AAPG Bull 79(9):1275–1300Google Scholar
  10. 10.
    Lucia FJ (2007) Carbonate reservoir characterization. Springer, Berlin, pp 32–54Google Scholar
  11. 11.
    Lønøy A (2006) Making sense of carbonate pore systems. AAPG Bull 90(9):1381–1405CrossRefGoogle Scholar
  12. 12.
    Sadooni FN, Alsharhan AS (2003) Stratigraphy, microfacies, and petroleum potential of the Mauddud Formation (Albian–Cenomanian) in the Arabian Gulf basin. AAPG Bull 87(10):1653–1680CrossRefGoogle Scholar
  13. 13.
    Aqrawi AAM, Thehni GA, Sherwani GH, Kareem BMA (1998) Mid-Cretaceous rudist-bearing carbonates of the Mishrif formation: an important reservoir sequence in the Mesopotamian basin, Iraq. J Pet Geol 21(1):57–82CrossRefGoogle Scholar
  14. 14.
    Aqrawi AAM, Goff JC, Horbury AD, Sadooni FN (2010) The petroleum geology of Iraq. Scientific Press, BeaconsfieldGoogle Scholar
  15. 15.
    Alsharhan AS (1995) Facies variation, diagenesis, and exploration potential of the Cretaceous rudist-bearing carbonates of the Arabian Gulf. AAPG Bull 79(4):531–550Google Scholar
  16. 16.
    Davies RB, Casey DM, Horbury AD, Sharland PM, Simmons MD (2002) Early to Mid-Cretaceous mixed carbonate-clastic shelfal systems: examples, issues and models from the Arabian Plate. Geoarabia-Manama- 3:541–598Google Scholar
  17. 17.
    Rahman MH, Pierson BJ, Wan IWY (2011) Classification of microporosity in carbonates: examples from miocene carbonate reservoirs of Central Luconia, Offshore Sarawak, Malaysia. Paper presented at the international petroleum technology conference, 2011Google Scholar
  18. 18.
    Scholle PA, Ulmer-Scholle DS (2003) A color guide to the petrography of carbonate rocks: grains, textures, porosity, diagenesis. AAPG Memoir 77(77):1–486Google Scholar
  19. 19.
    Dunham RJ (1962) Classification of carbonate rocks according to depositional textures. AAPG Memoir 1(1):108–121MathSciNetGoogle Scholar
  20. 20.
    Embry AF III, Klovan JE (1971) A late Devonian reef tract on northeastern Banks Island, NWT. Bull Can Pet Geol 19(4):730–781Google Scholar

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© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Research Institute of Petroleum Exploration and DevelopmentPetroChinaBeijingChina

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