The theoretical-empirical technique of hydrocarbons prediction in wells sections. New aspects


  • L. Skakalska Carpathian Branch of Subbotin Institute of Geophysics of the National Academy of Science of Ukraine, Ukraine
  • A. Nazarevych Carpathian Branch of Subbotin Institute of Geophysics of the National Academy of Science of Ukraine, Ukraine
  • V. Kosarchyn L’viv National Agrarian University, Ukraine



We present the developed theoretical-empirical technique for predicting of rocks’ oil-and-gas bearing in wells sections according to acoustic logging (AL) and core research (CR) and its variants by using data of other loggings and also the results of testing them on wells sections data in the Western oil and gas bearing region of Ukraine (WOGR). The mathematical apparatus of the created technique is based on a mathematical model of solid porous rock, empirical relationships between elastic and reservoir characteristics of rocks and acoustic logging data for specific studied wells. The key parameter in the calculations is the rock compressibility. Determination of the porosity of rocks and prediction of the type of pore filler (water, oil, gas) is implemented by comparing the results of calculating the velocities using theoretical and constructed empirical relationships with the actual data of the AL, by the parameter of compressibility of rocks, by the density of the pore filler fluid.

Additional versions of the technique have been developed based on correlation dependences and data from other logging methods — gamma-ray logging (GL), electric logging (EL/SP), offset method and seismic logging (SL). They are used in case of absence of AL data for the studied wells or for the intervals of their sections, and also for improving the reliability of prediction the oil and gas content of these sections. The software for the implementation of the technique was developed in Fortran, C# and Excel software environments.

The technique was tested on the data of wells of a number of structures of the WOGR of Ukraine (Lishchyns’ka, Buchats’ka, Ludyns’ka, Zaluzhans’ka, Zarichnyans’ka and Nyklovyts’ka).The technique ensures reliable prediction of petrophysical characteristics, porosity and oil-gas-water saturation of rock layers of different thicknesses (including thin layers — from 0.1—0.2 m) in well sections. For this, in addition to the data of the general parametric base of the WOGR reservoir rocks, the specially constructed refined empirical relations for various specific types and subtypes of the WOGR reservoir rocks are used, they are based on the results of analysis of petrophysical characteristics of those rocks.


Krups’kyy, Yu.Z. (2001). Geodynamicconditions of the formationand the oil-and-gas content in the Carpathian and Volyno-Podillyaregions of Ukraine. Kyiv: UkrSGP Publ., 144 p. (in Ukrainian).

Krups’kyy, Yu.Z., Kurovets’, I.M., Sen`kovskyy, Yu.V., Mykhaylov, V.A., Chepil’, P.M., Dryhant, D.M., Shlapins`kyy, V.Ye., Koltun, Yu.V., Chepil’, P.M., Kurovets’, S.S., & Bodlak, V.P. (2014). Unconventional sourcesof hydrocarbons in Ukraine: Monograph. Book. 2. Western oil and gas region. Kyiv: Nicka Centre Publ., 400 p. (in Ukrainian).

Kurovets, I., Drygant, D., Naumko, I., Kurovets, S., & Koltun, Yu. (2012). Geological and physical-chemical characteristics of lower Paleozoic deposits of Volyno-Podillya, Western Ukraine. Biuletyn Państwowego Instytutu Geologicznego, 449, 119—130 (in Polish).

Petkevych, G.I., & Verbytskiy, T.Z. (1970). Acoustic studies of rocks in oil wells. Kiev: Naukova Dumka, 126 p. (in Russian).

Skakalska, L.V. (2014a). Physical and reservoir properties prediction for reservoir rocks in unconventional gas-bearing geological structures. Visnyk Taras Shevchenko National University of Kyiv. Geology, (1), 35—40 (in Ukrainian).

Skakalska, L.V. (2014b). Prediction of physical and reservoir properties of rock-reservoirs for searching of unconventional gas. SOCAR Proceedings, (1), 4—10. (in Russian).

Skakalska, L.V., & Nazarevych, A.V. (2016a). Generalized equations for method of predicting of rocks oil-gas-water-saturation in the wells open-casts. Visnyk Taras Shevchenko National University of Kyiv. Geology, (1), 60—69 (in Ukrainian).

Skakalska, L.V., & Nazarevych, A.V. (2015a). Predicting of fluid saturation of rock-collectors according to gamma-logging data: 14th EAGE International Conference on Geoinformatics — Theoretical and Applied Aspects «Geoinformatics-2015». Kyiv. (in Ukrainian).

Skakalska, L.V., & Nazarevych, A.V. (2015b). Predicting of oil-gas-water-saturation of rocksof different lithology and geodynamic genesis in open-casts of wells. Geodynamics, (1), 102—119. (in Ukrainian).

Skakalska, L.V., & Nazarevych, A.V. (2014). Techniques of predicting petrophysical characteristics of oil-gas-water-saturation of wells log (on the example of data of the 3-Buchachs’ka well, Ukraine). Interdisciplinary Institute «Science and education», (5), 25—29 (in Russian).

Skakalska, L.V., & Nazarevych, A.V. (2016b). The methodology for predicting of oil-gas-saturation of rocks in open-casts of wells. Oil, Gas and Business, (3), 38—44 (in Russian).

Skakalska, L.V., & Nazarevych, A.V., & Kosarchyn, V.I. (2018). The theoretical-empirical technique of hydrocarbons prediction in the boreholes logs with the basic parameter — compressibility. Mineral resources of Ukraine, (4), 18—25 (in Ukrainian).

Skakalska, L.V., Nazarevych, A.V., & Struk, Ye.S. (2017). Algorithms and programs for logging data processing in oil and gas predicting of rocks. Visnyk of NU «Lviv polytechnics» «Computer science and information technology», (864), 210—221 (in Ukrainian).

Verbytskiy, T.Z. (1977). The physical nature of the nonlinear elasticity of geological media with phase microinhomogeneities and the features of propagation of elastic waves in them. Geophysical collection of AN USSR, 75, 16—24 (in Russian).

Verbytskiy, T.Z., Pochynayko, R.S., Starodub, Yu.P., & Fedoryshyn, A.S. (1985). Mathematical modelling in seismic prospecting. Kiev: Naukova Dumka, 276 p. (in Russian).




How to Cite

Skakalska, L. ., Nazarevych, A. ., & Kosarchyn, V. . (2021). The theoretical-empirical technique of hydrocarbons prediction in wells sections. New aspects. Geofizicheskiy Zhurnal, 43(1), 160–180.