There are two objects currently being developed at the Srednebotuobinskoye field: the clastic Botuobinsky Horizon and the carbonate Osinsky Horizon. The Osinsky Horizon was brought into production in 2018 based on the results of 3D common midpoint (CMP) seismic after identification of ring-shaped anomalies. The seismic sweet-spot analysis made it possible to assess the distribution of zones with better reservoir properties. At the same time, in order to reduce risks of production drilling, it was necessary to find the most productive zones. For this purpose, a comprehensive analysis of data on the Osinsky horizon was carried out. This article provides key points of the complex interpretation of such data. The accumulation and diagenetic alterations of carbonate rocks were established. It was concluded that the pore structure was complex and the reservoir properties of the Osinsky Horizon varied due to initial lithological heterogeneity. Well logging data interpretation is also provided. The essential set of methods for obtaining reliable values for the porosity and net thicknesses were proposed. An approach to a quantitative assessment of the linear capacity parameter was provided. Moreover, an assessment of the reliability and accuracy of the prediction was carried out. Drilling technical support with a new approach applied was implemented for two wells. Drilling results were used to validate the geological model.
References
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