Modeling of the elastic properties of bitumen-saturated sandstone in the deposits of the Ufimian Stage of the Permian System

E.A. Yachmeneva ^a*, D.I. Khassanov ^a**, E.G. Grunis ^b***

^aKazan Federal University, Kazan, 420008 Russia

^bTatar Geological Exploration Department of PJSC Tatneft named after V.D. Shashin, Kazan, 420021 Russia

E-mail: ^*EAYachmenjova@gmail.com, ^**damir.khassanov@mail.ru, ^***evgenii.grunis@mail.ru

Received July 2, 2021

ORIGINAL ARTICLE

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DOI: 10.26907/2542-064X.2021.3.477-489

For citation: Yachmeneva E.A., Khassanov D.I., Grunis E.G. Modeling of the elastic properties of bitumen-saturated sandstone in the deposits of the Ufimian Stage of the Permian System. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2021, vol. 163, no. 3, pp. 477–489. doi: 10.26907/2542-064X.2021.3.477-489. (In Russian)

Abstract

Modeling of the elastic properties of a bitumen-saturated sandstone layer in the deposits of the Ufimian Stage of the Permian System was performed using the data from well logging and core research. Since elastic properties link the geological model parameters and the wave field amplitudes, this study seems to be of high relevance. Such modeling expands the possibilities of geophysical data interpretation and improves the reliability of seismic forecasts. The seismic methods are informative for monitoring the production of reserves, including the deposits under consideration, by taking into account the features of layers occurrence and the saturating fluid. Our core study of the deposits is based on the X-ray phase analysis and the interpretation of well logging data. The results of the laboratory study were indicative to evaluate the settings of the obtained volumetric lithological model. The lithological model must be adjusted correctly, because it enables the estimation of the variability of the reservoir characteristics by its thickness, which, in turn, helps to provide a better forecast of its reservoir properties and elastic characteristics. The accuracy of the modeling results was estimated and analyzed. The petroelastic modeling carried out by us yields valuable data for both reservoir and non-reservoir forecasts in the studied geological section.

Keywords: elastic properties of rocks, X-ray phase analysis, bitumen-saturated sandstone, well logging, modeling of elastic properties

Acknowledgments. The study was supported by the Russian Foundation for Basic Research (project no. 19-35-90045).

Figure Captions

Fig. 1. Schematic lithological and stratigraphic section of the Nizhne-Karmalskoe deposit using one of the wells as an example.

Fig. 2. Histograms of the distribution of GGL values before and after normalization. The color of the curves shows the data values in the reference formation for each well under consideration.

Fig. 3. Comparison of the results of the statistical method of constructing a volumetric model with the XRD data using one of the wells as an example.

Fig. 4. Estimation of the error of model curves in comparison with the logging data: a) density error; b) longitudinal wave error; c) transverse wave error.

Fig. 5. Results of modeling the elastic properties for one of the wells.

Fig. 6. Differentiation of rocks into lithotypes according to the elastic parameters.

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