K.Yu. Chuchalina, G.V. Kazancev, D.A. Zunde
Prediction of continental facies distribution by the example of J2–4 Jurassic reservoir (Malyshevsky Formation, West Siberian basin)
Key words: continental sediments; facies; core; pseudo-sandiness; seismic facies analysis; integrated interpretation; quantitative estimation; cutoff values.
For citation: Chuchalina K.Yu., Kazancev G.V., Zunde D.A. Prediction of continental facies distribution by the example of J2–4 Jurassic reservoir (Malyshevsky Formation, West Siberian basin). Geologiya nefti i gaza. 2021;(6):73–82. DOI: 10.31087/0016-7894-2021-6-73-82. In Russ.
In the initial stage pf a field development, the comprehensive analysis of all the available geological and geophysical data is of critical importance. Particular attention should be paid to well and 3D seismic data integration, which allows predicting facies distribution in the space between the wells and determining reservoir intervals having the best reservoir properties. In order to obtain a high-quality spatial forecast from seismic data, the proper handling of amplitude cube in required, for example, conversion into cubes of acoustic impedance, elastic parameters or pseudo-sandiness, as well as analysis of slices of various seismic attributes in the target interval. Attribute analysis includes not only qualitative, but also quantitative estimation of seismic record kinematic and dynamic parameters, which allows more detailed zoning of the territory. Today, 3D seismic data are the key information for building 3D field geological models. The authors research aims to: explore the possibilities of seismic exploration in analysing spatial facies variability together with well data interpretation; use of seismic inversion cube to construct a conceptual geological model; and develop an approach to integrated interpretation of 2D and 3D seismic data. The paper presents an example of geological and geophysical data integration with the purpose to create seismic facies model of J2-4 reservoirs in one of the oil and gas condensate fields. The field is situated in the Yamal-Nenets Autonomous Okrug — in the northern part of the Gydan Peninsula and partially in the waters of the Ob Bay. Exploration maturity of the study area is low — four deep wells are drilled here, and only two of them are cored.