Microfaunal Assemblage of the Sui Main Limestone from Sui Gas Field, Pakistan


Sui main limestone, eocene (Ypresian), reservoir, sui gas field, microfauna, foramiifera, paleoenvironment.

How to Cite

Rafi, S., Khursheed, S., & Mohsin, S. I. (2012). Microfaunal Assemblage of the Sui Main Limestone from Sui Gas Field, Pakistan. Journal of Basic & Applied Sciences, 8(1), 85–90. https://doi.org/10.6000/1927‐5129.2012.08.01.12


Sui Main Limestone (SML) is the best reservoir in the Middle Indus Basin of Pakistan. It is an important reservoir that has produced gas for the last fifty (50) years and continues to produce 600 MMCF per day. The characteristic microfossil assemblages within the SML have been studied from fifty two thin sections of the reservoir rock from four Sui wells for understanding the reservoir architecture and quality. There are two distinctive fossil assemblages within SML Formation. The major lower part (>300m) is a carbonate facies of massive fossiliferous limestone dominated by Nummulites along with Alveolina, Discocyclina and Miliolids. The upper part (20m) consists of argillaceous fossiliferous limestone interbedded with calcareous shale layers, making a transition to the overlying Ghazij shales. Assilina is the characteristic fossil with its associated assemblage



Siddiqui NK. Sui Main Limestone: Regional geology and the analysis of original pressures of a closed system reservoir in central Pakistan. AAPG Bulletin 2004; 88: No.7, July 2004. http://dx.doi.org/10.1306/012004200150

Kadri IB, Petroleum Geology of Pakistan. Pakistan Petroleum Ltd 1995; 275 p.

Kazmi, A.H. and Abbasi, I.A., Stratigraphy and historical geology of Pakistan. Graphic publishers, Karachi, Pakistan 2008; 524p.

Cushman JA. Foraminifera, their classification and economic use. Cambridge, Harvard University Press 1959; 605p.

Moore CR, Lallicker. GC, Fischer GA. Invertebrate Fossils. McGraw Hill Book Company Inc 1952; 750 p.

Moore RC (ed.), Treatise on Invertebrate Paleontology. Part C, vol.1&2, Part H and Part I.pages C900. The Geological Society of America and The University of Kansas Press 1962.

Brasier MD. Microfossils. George Allen & Unwin London. 1980; 193p.

Flǜgel E. Microfacies of Carbonate rocks, analysis, interpretation and applications. Springer, Germany 2004; 976p.

Haq BU, Boersma A. Introduction to marine micropaleontology. Elsevier, New York 1980; 374p.

Roohi G, Baqri SRH. The importance of nummulites and assilina in the coorelation of middle and upper Eocene rocks. In: 19th Himalaya-Karakoram-Tibet workshop, 2004, Niseko, Japan. Himalayan Journal of Science, 2004; 2: issue 4 (special issue).

Mehr MK, Abadi MH. Application of large benthonic foraminifera as a tool for interpretation of paleoclimate and water depth, in the Ziyarat Formation, Alborz, Iran. Geophysical Research Abstracts, 2009; 11: EGU General Assembly

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.