A deposit has been discovered in a poorly explored area, the main part of sedimentary cover of which consists of Paleozoic and Mesozoic rock formations. During the exploration well drilling, the commercial oil content of three strata, including a Cenomanian carbonate formation, has been confirmed. While conducting a joint analysis of core data, well logging, and field studies, factors associated with geological heterogeneity and sedimentary cyclicity have been identified. The integration of well logging surveys and core research data made it possible to substantiate the prospects of productive formations of a poorly studied deposit located within the Arabian Plate. Four petroclasses have been identified, based on the size and type of void space. The petroclass unites rocks characterized by a ratio of porosity and permeability comparable to the conditions of sedimentation and processes of secondary transformations.The most prospective intervals for commercial oil production are those associated with petroclasses 1, 2, and 4, located in the upper portion of the targeted formation. The electric microimager allowed for a detailed intra-layer analysis, confirming the plane-parallel layering. A complex of nuclear magnetic logging, gamma-gamma lithodensity, acoustic and neutron logging allow for the identification of petroclasses within the section based on research data obtained from open holes and the use of various correlations to predict the permeability and productivity of carbonate formations.
References
1. Murris R.J., The Middle East: stratigraphic evolution and oil habitat, American Association of Petroleum Geologists Bulletin, 1980, V. 64, pp. 597–618, DOI: http://doi.org/10.1306/2F91980F-16CE-11D7-8645000102C1865D
2. Privalova O.R., Taygina M.E., Asylgareev I.N., Ispol'zovanie vysokotekhnologichnykh geofizicheskikh metodov issledovaniy skvazhin dlya otsenki potentsiala karbonatnoy pachki v usloviyakh nizkoy izuchennosti (na primere blizhnevostochnogo mestorozhdeniya) (Using high-tech geophysical well survey methods to assess the potential of a carbonate pack in conditions of low exploration (using a Middle East field as an example)), Proceedings of symposium “Novaya tekhnika i tekhnologii GIS dlya neftegazovoy promyshlennosti” (New equipment and technologies for geophysical well logging for the oil and gas industry), Ufa: Novtek Biznes Publ., 2023, pp. 81–92.
3. Metodicheskie rekomendatsii po podschetu zapasov nefti i gaza ob’emnym metodom. Otsenka kharaktera nasyshchennosti po dannym GIS (Guidelines for the calculation of reserves of oil and gas by volumetric method. Assessment of the nature of saturation according to well logging): edited by Petersil’e V.I., Poroskun V.I., Yatsenko G.G., Moscow – Tver: Publ. of VNIGNI, 2003, 261 p.
4. Suleymanov D.D., Rykus M.V., The depositional settings and the hydrocarbon potential of the Neotethys passive continental margin (In Russ.), Neftegazovoe delo, 2023, V. 21, no. 6, DOI: http://doi.org/10.17122/ngdelo-2023-6-27-42.
5. Coates G.R., Xiao L., Prammer M.G., NMR logging principles and applications, Houston: Hullibarton Energy Services, 1999.
6. Tiab D., Donaldson E C., Petrophysics: theory and practice of measuring reservoir rock and fluid transport, Elsevier Inc., 2004, 926 p.
7. Log interpretation charts, Houston: Schlumberger, 1997, 170 p.
