Methodological approaches to building a geological model of the Lower Cretaceous clinoform complex within Antipayutinskaya depression

UDK: 553.98
DOI: 10.24887/0028-2448-2021-10-32-37
Key words: regional study, conceptual model, seismic facies analysis, net reservoir estimate, licensing
Authors: Е.А. Potapova (Tyumen Petroleum Research Center LLC, RF, Tyumen), L.А. Dubrovina (Tyumen Petroleum Research Center LLC, RF, Tyumen), N.А. Medvedeva (Tyumen Petroleum Research Center LLC, RF, Tyumen), А.А. Snokhin (Kynsko-Chaselskoe Neftegaz LLC, RF, Tyumen), R.R. Shakirov (Kynsko-Chaselskoe Neftegaz LLC, RF, Tyumen), О.V. Bakuev (Rosneft Oil Company, RF, Moscow)

To build a unified exploration strategy for the license areas of Rosneft Oil Company within the Antipayutinskaya depression, specialists of Rosneft subsidiaries in the period of 2019-2020 built a geological model of the clinoform complex over an area of 12,267 km2 based on 11,270 lin. km of seismic lines, taking into account 16 wells for further exploration of promising targets and resource assessment. To achieve the main goal, a number of tasks were completed: collected, generalized, analyzed information quality and content, systematized geological and geophysical information; performed a comprehensive study of core and fluids; completed additional processing of 408 seismic lines; built a structural model of reference and target horizons based on drilling and seismic data; made a petrophysical interpretation of logging data.

When building the model, the methods of seismic facies analysis were applied to 2D seismic data, taking into account the regional scale. A conceptual model of the clinoform complex was developed, net reservoir zones were predicted, promising targets were identified, and the volumetrics and the fluid type within the region of study were analyzed. Recommendations were developed for exploration and appraisal drilling. The practical result of the work was a significant increase in the oil and gas potential of the region and an increase in the resource base within the area of Rosneft operation and in the unallocated subsoil fund. As a result Rosneft obtained the right to use subsoil for the purpose of geological exploration as well as exploration and production of hydrocarbons at the Severo-Kustarnikovy license area. Based on the results of the work performed, a new oil field, Novoognennoye, was geometrized and registered in the State Reserve Register. Application of the developed methodology over a large territory will allow to confirm the developed algorithms and potentially apply the methodology to similar reservoirs in Western Siberia. In the future, the methodology can be replicated in all subsidiaries of the Company, which will allow to interpret the prospects in a unified manner, determine the phase state, and evaluate resources, including within the unallocated subsoil fund.


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