A new model of permeability of terrigenous granular reservoirs on the example of turney deposits of Yablunivske oil and gas condensate field of the Dnieper-Donets Basin
DOI:
https://doi.org/10.17721/1728-2713.92.09Keywords:
reservoir rock, well logging, permeability coefficient, petrophysical model, porosity, claynessAbstract
The scientific principles and the process of creating the petrophysical model of the permeability coefficient of terrigenous granular rocksreservoirs on the basis of laboratory researches of core material from productive deposits by the tourney of Yablunivske oil and gas condensate field of Dnieper-Donets basin are considered. The main types of formulas used to estimate the permeability coefficients of rocks according to well logging data are described. There are mainly two theoretical sources, which are the basis for the formation of different methods for determining the permeability coefficient according to the well logging. The most famous of these is the Kozeny-Karman formula. The second one is based on the use of hydraulic units of the reservoir HFU and FZI. The limitations and difficulties of application of various known methods for determining the permeability coefficient according to well logging data are described. This is mainly due to the mandatory use in the calculation of electrical characteristics of rocks (relative electrical resistivity, coefficient of increase of electrical resistivity), or the calculated parameter according to electrical logging methods (residual water saturation coefficient). The new model proposed by the authors allows determining the permeability of rocks regardless of the nature of their saturation and the degree of water saturation of the pore space, which is its significant advantage. In addition, the accuracy of permeability estimation using the new model is significantly higher compared to known models (for example, the Timur model). Real examples of application of a new model of terrigenous reservoirs permeability for conditions of productive deposits by the tourney of Yablunivske oil and gas condensate field are given.
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