By of Rosneft Oil Company in the last 10 years a significant number of hydrocarbon fields were being discovered in lithologic and combined traps connected with local zones of highly productive reservoirs («Sweet Areas») under the condition of monoclinal bedding within the area of Nepa-Botuoba anteclise.
The absence of anticlinal traps and non-uniformity of reservoir properties make standard approaches of estimation of resources and geological risks for this area improper. Therefore, there has been developed an internal method of estimation of resources and risks in which a classification of prospects is based on their exploration maturity and place in oil and gas exploration cycle. Also the process of estimation of a large number of similar prospects has been simplified due to selection of a common set of volumetric data.
This article discusses in detail the methodology for method of estimation of resources in accordance with the categorization proposed by the authors and approaches to the search for highly productive objects, and also highlights the main features of the structure of potential hydrocarbon deposits. Approaches to the assessment of geological risks, including practical examples, are described separately. Due to the extensive experience of Rosneft Oil Company in this area, a large database was collected in order to develop special approaches and methods described in the article, which made it possible to further check the resource assessment methods offered by the authors.
This method was evaluated on a series of exploration assets of Rosneft and is successfully used for rapid assessment of prospect of potential projects.
References
1. Gordeev YA.I., Gayduk A.V., Mityukov A.V., Filichev A.A., The results of exploration of Rosneft''s license areas in the Irkutsk region for 10 years (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 11, pp. 15–17.
2. Gayduk A.V., Fomin A.E., Tverdokhlebov D.N. et al., Oil and gas prospective facilities identification in the subsalt carbonate complex of Nepa-Botuoba anteclise as a result of historical 2D seismic data reprocessing and reinterpretation (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneftʹ”, 2016, no. 3, pp. 44–48.
3. Gayduk A.V., Kashirina E.G., Redʹkin N.A. et al., Regularities of development of perspective objects in carbonate Vendian-Cambrian sedimentary cover of the southern Siberian platform (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneftʹ”, 2016, no. 3, pp. 28–31.
