The carbonate lithofacies of the Nganzi Exploratory Block located in the Lukula Territory in the Central Kongo Province were described in the field, sampled and subjected to microscopic, mineralogical, physico-chemical and petrophysical analyses. The aim is to increase the probability of discovery of deposits following the drilling of exploration wells in the most appropriate structures. These carbonates, limestones (white, greyish and greenish) and dolomites (massive and platelets) are presented in packstone, grainstone and wackestone textures. In addition to the essential minerals of these rocks, calcite and dolomite, we find quartz, plagioclase and kaolinite. With a porosity between 11% and 19% and a permeability of 138 to 155 mD, the Nganzi carbonates, which contain up to 23% oil, constitute good oil reservoirs. The characterization of the detrital facies and the acquisition of a seismic survey of the wells is essential to have a more detailed knowledge of the oil resources of the Nganzi Block.
References
[1]
DR Congo (2015) Law No. 15/012 of August 1, 2015 on the General Hydrocarbons Regime. Official Journal of the DR Congo, 56th Year, 1st Part, Special Issue, Kinshasa, 48 p.
[2]
Sanda, O., Mabrouk, D., Tabod, T., Marcel, J., Essi, J. and Ngos III, S. (2020) The Integrated Approach of Seismic Attributes for the Lithological Characterization of Reservoirs: Case of Block F3, North Sea-Netherlands Sector. Open Journal of Earthquake Research, 9, 273-288. https://doi.org/10.4236/ojer.2020.93016
[3]
Arbab, B., Jahani, D. and Movahed, B. (2017) Characterization of Carbonate Reservoirs in Low Resistivity Peasant Areas in the Buwaib Formation, Persian Gulf. Open Journal of Geology, 7, 1441-1451. https://doi.org/10.4236/ojg.2017.79096
[4]
Dunham, J. (1970) Reef Stratigraphy versus Reef Ecology. American Association of Petroleum Geologists Bulletin, 54, 1931-1932.
[5]
Folkl (1980) Petrology of Sedimentary Rocks. Hemphills, Austin, 182.
[6]
Wetshondo Osomba, D. (2012) Characterization and valuation of clay materials in the Province of Kinshasa (DR Congo). Doctoral Thesis, Applied Sciences, University of Liège/Wallonia-Europe University Academy, Liège, 340.
[7]
Thorez, J. (1976) Practical Identification of Clay Minerals. Ed. G. Lelotte, Dison, 90 p.
[8]
Brown, G. and Brindley, G.W. (1980) X-Ray Diffraction Procedures for Clay Mineral Identification. In: Brindley, G.W. and Brown, G. Eds., Crystal Structures of Clay Minerals and Their X-Ray Identification, Mineralogical Society of Great Britain and Ireland, London, 305-359. https://doi.org/10.1180/mono-5.5
[9]
Cook, H.E., Johnson, P.D., Matti, J.C. and Zemmels, I. (1975) Methods of Sample Prepration and X-Ray Diffraction Analysis in X-Ray Mineralogy Laboratory, Deep Sea Drilling Project, University of California, Riverside. In: Kaneps, A.G., et al. (Eds.), Initial Reports of the Deep Sea Drilling Project XXVIII, Printing Office, Washington DC, 999-1007. https://www.semanticscholar.org/paper/Methods-of-Sample-Preparation-and-X-Ray-Diffraction-Cook-Johnson/0e78699f3c5f17b50ea71c79dfd058f84a76b448
[10]
Boulvain, F. (2017) Elements of Sedimentology and Sedimentary Petrology. Lab. Sedimentary Petrology, University of Liège, Liège, 29 p
[11]
Lucia, J. (2007) Carbonate Reservoir Characterization. The University of Texas at Austin, Bureau of Economic Geology, Geological Circular, Austin, 342 p.
[12]
Perrodon, A. (1985) Petroleum Geodynamics: Genesis and Distribution of Hydrocarbon Deposits. Second Edition (Revised and Supplemented), Masson-Elf Aquitaine, Paris, 385 p.
[13]
Cossé, R. (1988) The Deposit. Technip and French Institute of Petroleum, Paris, 352 p.
[14]
Huc, A.Y. (2006) Petroleum Geochemistry. Course Notes, French Petroleum Institute (IFP), Paris, 115 p.
[15]
Espitalie, J., Laporte, J.l., Madec, M., Marquis, F., Leplat, P., Paulet, J. and Boutefeu, A. (1977) Rapid Method for Source Rocks Characterization and for Determination of Petroleum Potential and Degree of Evolution. Revue de l’Institut Francais du Petrole, 32, 23-42. https://doi.org/10.2516/ogst:1977002 https://ogst.ifpenergiesnouvelles.fr/articles/ogst/abs/1977/01/vol32n1p23/vol32n1p23.html
[16]
Reyre, D. (1984) Petroleum Characteristics and Geological Evolution of a Passive Margin. The Case of the Bas-Congo-Gabon Basin. Bulletin des Centres de Recherches. Exploration—Production Elf Aquitaine, 8, 303-332. https://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=8939675
[17]
Hamm, P.H. and Hochstrasser, L.M. (1998) Structure of the Amide I Band of Peptides Measured by Femtosecond Nonlinear-Infrared Spectroscopy. The Journal of Physical Chemistry B, 102, 6123-6138. https://doi.org/10.1021/jp9813286
