Abstract

The main uncertainty for building 3D geologic and process models is distribution of properties in the inter-well space. The fields comprised of carbonate reservoirs are characterized by the complex porous space structure: availability of secondary porosity, cavern or fracture components. The objective of this paper is to increase the accuracy of the prediction of lithology and permeability and porosity of complex carbonate reservoirs applying the method of petroelastic modelling using the example of one of the Central Khoreyver Uplift (CKU) fields. Obtaining 3D geological and process models capable of quality implementation of representation of the fields’ geological peculiarities is necessary for the purpose of the development tasks: decreasing the uncertainties and reducing the development drilling risks.

The paper proposes a method for predicting reservoir properties of carbonate deposits of Famennian strata of Timano-Pechora petroleum province on the basis of petroelastic modelling. The basis of the method is the principle of complexing different scale geological and geophysical surveys. The lithological division of rocks and identification of reservoir types were performed for the reviewed carbonate deposits. The detailed volumetric lithological and petrophysical models with subsequent tying the obtained results with the core material lithological survey data were developed under results of the complex well logging survey interpretations. An efficient environment model was selected for the reviewed carbonate deposits and petroelastic modelling was carried out. The criteria for predicting the reservoir properties using the seismic data with application of the amplitude inversion method were formulated under results of the petroelastic connections analysis.

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