For some complex Visean oil-saturated intervals of the fields of the Perm Krai, a high electrical resistance has been established. This can be explained by the hydrophobicity and bitumen content of the reservoirs. The assessment of these parameters was carried out analysing a petrophysical and geophysical data for a number of large oilfields. X-ray tomography was used to assess the wettability of the core samples, which was compared with lateral log data. Comparison of core X-ray tomography results with electrical logging data shows that at resistivity over 200 ohm∙m the rocks are hydrophobic, and at a resistivity over 600 ohm∙m they practically do not take water. The bituminisation of the reservoirs was analysed from the core material, taking into account the porosity according to the nuclear logging data, as well as the electrical resistivity from the lateral and micro-lateral logs.  We demonstrate that log porosity and resistivity data can be used in developing algorithms, in building wettability and bituminisation maps of the main fields. These maps can be further utilized in building 3D reservoir models and in optimization of the secondary recovery operations in the field. The analysis of all the data suggests that open porosity is the key parameter controlling bituminisation. According to the obtained results, algorithms have been developed to predict the formation bituminisation using a set of logging methods. The results of the developed method were applied in digital geological and technological modelling of deposits with different types of wettability and bitumen content.

Keywords: hydrophobisation, wet­tability, bituminisation, po­r­o­sity, electrical resistivity of rocks, X-ray core tomography, laterolog, microlaterolog

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