Geological aspects of the development of hydrocarbon deposits with hard-to-recover reserves

UDK: 553.04
DOI: 10.24887/0028-2448-2021-3-50-53
Key words: reservoir, oil, gas, reserves, porosity, permeability, fractures
Authors: A.Yu. Belov (Zarubezhneft JSC, RF, Moscow), A.A. Belova (Gubkin University, RF, Moscow), P.N. Strakhov (RUDN University, RF, Moscow)

This article discusses the results of the study of hard-to-recover reserves development features. The research was carried out at Zarubezhneft JSC and the RUDN University. Geological factors are considered that affect the effectiveness of stimulating the formation during oil and gas deposits development (maintaining formation pressure, water-gas stimulation, injection of reagents that reduce oil viscosity, steam injection, and others). The article presents an extended scheme of typing the factors that determine the existence of accumulations with hard-to-recover hydrocarbon reserves including the issues of such deposits development. Cases are considered when the underestimation of zones of increased permeability caused by the development of fractures determines both the practical exclusion of the upper parts of hydrocarbon deposits from the development, and the possibility of forming paths for advanced watering, which negatively affect the development of oil and gas. Particular attention was paid to the analysis of the mechanism of formation and evolution of the fractured type of voids in carbonate deposits, which makes it possible to increase the reliability of determining the nature of the distribution of this type of voids in the volume of the deposit. On the example of a number of deposits of the Timan-Pechora oil and gas province, confined to carbonate reservoirs, two types of fractured layers are distinguished. The first occurs in the upper part of the strata, occurring on rocks with cavernous-pore and porous reservoir types, which are confined to parts of deposits that are often not taken into account when calculating hydrocarbon reserves. The second type is recorded in the central part of the reservoir section, which often determines the advanced waterflooding, which negatively affects the oil recovery factor.

References

1. Sapozhnikov A.B., Strakhov P.N., Filippov V.P. et al., Systematization of geological factors that determine the existence of hydrocarbon accumulations with hard recoverable reserves (In Russ.), Neftepromyslovoe delo, 2017, no. 10, pp. 4–9.

2. Gavrilov V.P., Forecast for potential trends of russian and global energy complex development (In Russ.),  Geologiya nefti i gaza, 2016, no. 5, pp. 24–31.

3. Strakhov P.N., Belova A.A., Markelova A.A., Strakhova E.P., Accounting for productive deposits heterogeneity in geological modeliling in order to improve an efficiency of water-alternated-gas injection (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 2, pp. 46–49.

4. Strakhov P.N., Sapozhnikov A.B., Bogdanov O.A., Prospects for increasing oil production due to the development of accumulations with hard-to-recover reserves of deposits of the famennian stage in the southwestern part of the khorever depression (In Russ.), Vestnik Assotsiatsii burovykh podryadchikov, 2017, no. 4, pp. 24–27.

5. Strakhov P.N., Bogdanov O.A., Koloskov V.N., Sapozhnikov A.B., Localization of objects with hard-to-recover hydrocarbon reserves in the composition of deposits confined to carbonate deposits (In Russ.), Nauka i tekhnika v gazovoy promyshlennosti, 2017, no. 4, pp. 3–11.

6. Strakhov P.N., Reasons for the weakening of correlations between sedimentation conditions and capacity properties of carbonate deposits during their lithogenesis (In Russ.), Geologiya nefti i gaza, 1996, no. 9, pp. 30–37.

7. Strakhov P.N., Formirovanie kaverno-porovogo prostranstva v karbonatnykh otlozheniyakh (Formation of cavernous pore space in carbonate sediments), Moscow: Marketing Publ., 2005, 76 p.

8. Ar'e A.G., Fizicheskie osnovy fil'tratsii podzemnykh vod (Physical principles of groundwater filtration), Moscow: Nedra Publ., 1984, 101 p.

9. Carbonates: Mineralogy and chemistry: edited by Reeder R.J., Mineral. Soc. Amer. Reviews in Mineralogy, 1983.

This article discusses the results of the study of hard-to-recover reserves development features. The research was carried out at Zarubezhneft JSC and the RUDN University. Geological factors are considered that affect the effectiveness of stimulating the formation during oil and gas deposits development (maintaining formation pressure, water-gas stimulation, injection of reagents that reduce oil viscosity, steam injection, and others). The article presents an extended scheme of typing the factors that determine the existence of accumulations with hard-to-recover hydrocarbon reserves including the issues of such deposits development. Cases are considered when the underestimation of zones of increased permeability caused by the development of fractures determines both the practical exclusion of the upper parts of hydrocarbon deposits from the development, and the possibility of forming paths for advanced watering, which negatively affect the development of oil and gas. Particular attention was paid to the analysis of the mechanism of formation and evolution of the fractured type of voids in carbonate deposits, which makes it possible to increase the reliability of determining the nature of the distribution of this type of voids in the volume of the deposit. On the example of a number of deposits of the Timan-Pechora oil and gas province, confined to carbonate reservoirs, two types of fractured layers are distinguished. The first occurs in the upper part of the strata, occurring on rocks with cavernous-pore and porous reservoir types, which are confined to parts of deposits that are often not taken into account when calculating hydrocarbon reserves. The second type is recorded in the central part of the reservoir section, which often determines the advanced waterflooding, which negatively affects the oil recovery factor.

References

1. Sapozhnikov A.B., Strakhov P.N., Filippov V.P. et al., Systematization of geological factors that determine the existence of hydrocarbon accumulations with hard recoverable reserves (In Russ.), Neftepromyslovoe delo, 2017, no. 10, pp. 4–9.

2. Gavrilov V.P., Forecast for potential trends of russian and global energy complex development (In Russ.),  Geologiya nefti i gaza, 2016, no. 5, pp. 24–31.

3. Strakhov P.N., Belova A.A., Markelova A.A., Strakhova E.P., Accounting for productive deposits heterogeneity in geological modeliling in order to improve an efficiency of water-alternated-gas injection (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 2, pp. 46–49.

4. Strakhov P.N., Sapozhnikov A.B., Bogdanov O.A., Prospects for increasing oil production due to the development of accumulations with hard-to-recover reserves of deposits of the famennian stage in the southwestern part of the khorever depression (In Russ.), Vestnik Assotsiatsii burovykh podryadchikov, 2017, no. 4, pp. 24–27.

5. Strakhov P.N., Bogdanov O.A., Koloskov V.N., Sapozhnikov A.B., Localization of objects with hard-to-recover hydrocarbon reserves in the composition of deposits confined to carbonate deposits (In Russ.), Nauka i tekhnika v gazovoy promyshlennosti, 2017, no. 4, pp. 3–11.

6. Strakhov P.N., Reasons for the weakening of correlations between sedimentation conditions and capacity properties of carbonate deposits during their lithogenesis (In Russ.), Geologiya nefti i gaza, 1996, no. 9, pp. 30–37.

7. Strakhov P.N., Formirovanie kaverno-porovogo prostranstva v karbonatnykh otlozheniyakh (Formation of cavernous pore space in carbonate sediments), Moscow: Marketing Publ., 2005, 76 p.

8. Ar'e A.G., Fizicheskie osnovy fil'tratsii podzemnykh vod (Physical principles of groundwater filtration), Moscow: Nedra Publ., 1984, 101 p.

9. Carbonates: Mineralogy and chemistry: edited by Reeder R.J., Mineral. Soc. Amer. Reviews in Mineralogy, 1983.


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