Establishing the correlation between reservoir properties and facies features of the Bashkir sediments of the Gagarinskoye field

UDK: 550.832
DOI: 10.24887/0028-2448-2019-2-24-27
Key words: facial features, core, carbonate sediments, rate of open porosity, absolute permeability on gas
Authors: O.E. Kochneva (Saint-Petersburg Mining University, RF, Saint-Petersburg), U.V. Nefedov (Saint-Petersburg Mining University, RF, Saint-Petersburg), N.V. Fedorov (Saint-Petersburg Mining University, RF, Saint-Petersburg)

Due to the increase of the volume of hard-to-recover oil reserves in the fields with a complex structure of reservoir rocks, a high degree of their heterogeneity and low filtration capacitive properties, the authors studied lithological and facies researches and correlation analysis of the reservoir properties of the Bashkir sediments of the Gagarin field as a bright representative of the described type of fields. The rates of open porosity and absolute permeability on gas were studied and analyzed, and facies in the rocks of this deposit were characterized. As a result of the description, coastal marine shallow-water facies and marine shallow-water facies of the open sea were identified. Among the last, the facies of shoals and some facies of settlements of various organisms were identified, including algae settlements, foraminifer settlements, and facies relatively flat seabed with a mobile and calm hydrodynamic regime. The data, including the rates of porosity, permeability and residual water saturation, was analyzed separately for each facies. The correlation dependences of the permeability coefficient on porosity and residual water saturation on porosity were constructed for the established facies, and the nature of their relationship was identified and regression equations were derived. The research revealed a strong and significant relationship of the studied parameters for both selected facies of the settlements of different organisms, as well as for the facies of the areas of the flat seabed with a calm hydrodynamic regime, weak and insignificant - for the facies of the areas of the flat seabed with a mobile hydrodynamic regime. The absence of correlation between the parameters was found for the sediments of shoal facies and coastal marine shallow-water closed ones, and for the last the correlation of porosity and residual water saturation was not established due to the lack of data.

Based on the research several conclusions were made. The development of pore and cavernous reservoirs is controlled by the predominant types of rocks – algae limestones. In the Bashkir sediments, among others, the predominant importance belongs to the facies of settlements of various organisms. The correlation analysis for the Bashkir sediments revealed the strongest and most significant relationship of porosity and permeability for the facies of the areas of the flat seabed with a calm hydrodynamic regime, algae settlements and foraminifera settlements, and the relationship between porosity and residual water saturation for the facies of the algae settlements and the areas of the flat seabed with a calm hydrodynamic regime.

References

1. Efimov A.A., Kochneva O.E., Evaluation of the influence of facies affiliation on carbonate deposits’ injectivity of Bashkirskiy layer of Siberian field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 10, pp. 15–19.

2. Mirolyubova E.S., Viskunova K.G., Effect of sedimentation conditions on the formation of reservoir strata in carbonate sediments of the aquatorial part of the Timan-Pechora province (In Russ.), Zapiski Gornogo instituta, 2008, V. 176, pp. 31–35.

3. Nalivkin D.V., Uchenie o fatsiyakh (The doctrine of facies), Moscow: Publ. of USSR AS, 1956.

4. Rukhin L.B., Osnovy obshchey paleogeografii (Fundamentals of general paleogeography), V. 557, Leningrad: Gostoptekhizdat Publ., 1959, 196 p.

5. Krasheninnikov G.F., Uchenie o fatsiyakh (The doctrine of facies), Moscow: Vysshaya shkola Publ., 1971, 388 p.

6. Shcherbakov O.A., Zakonomernosti prostranstvennogo raspredeleniya osadkov v kamennougol'nykh moryakh Zapadnogo Urala (Regularities of spatial distribution of precipitation in the Carboniferous seas of the Western Urals), The collection: Geologiya i geofizika neftegazonosnykh oblastey (Geology and geophysics of oil and gas areas), Ufa, 1982, pp. 83–92.

7. Krinari A.I., About the unification scheme for classification of oil and gas reservoirs (In Russ.), Geologiya nefti i gaza, 1959, no. 7, p. 8.

8. Efimov A.A., Kochneva O.E., Development of predictive models to estimate the oil mobility coefficient with account of facies conditions (on the example of Bsh formation of Batyrbaisky field) (In Russ.), Neftepromyslovoe delo, 2017, no. 1, pp. 20–24.

9. Kochneva O.E., Efimov A.A., Influence of facial features on reservoir properties of the bashkirian carbonate deposits of the Lake field (In Russ.), Vestnik Permskogo universiteta. Geologiya = Bulletin of Perm University. Geology, 2017, V. 16, no. 1, pp. 96–98.

10. Galkin V.I., Efimov A.A., Kochneva O.E., Ya.V. Savitsky. Study of the mobility coefficient dependence on petrophysical characteristics by the example of Bsh layer of Sibirskoye deposit (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 4, pp. 13–15.

11. Efimov A.A., Kochneva O.E., Application of facies peculiarities of carbonate deposits of Sibirsky field to study correlations between porosity and permeability coefficients (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2010, no. 12, pp. 15.

Due to the increase of the volume of hard-to-recover oil reserves in the fields with a complex structure of reservoir rocks, a high degree of their heterogeneity and low filtration capacitive properties, the authors studied lithological and facies researches and correlation analysis of the reservoir properties of the Bashkir sediments of the Gagarin field as a bright representative of the described type of fields. The rates of open porosity and absolute permeability on gas were studied and analyzed, and facies in the rocks of this deposit were characterized. As a result of the description, coastal marine shallow-water facies and marine shallow-water facies of the open sea were identified. Among the last, the facies of shoals and some facies of settlements of various organisms were identified, including algae settlements, foraminifer settlements, and facies relatively flat seabed with a mobile and calm hydrodynamic regime. The data, including the rates of porosity, permeability and residual water saturation, was analyzed separately for each facies. The correlation dependences of the permeability coefficient on porosity and residual water saturation on porosity were constructed for the established facies, and the nature of their relationship was identified and regression equations were derived. The research revealed a strong and significant relationship of the studied parameters for both selected facies of the settlements of different organisms, as well as for the facies of the areas of the flat seabed with a calm hydrodynamic regime, weak and insignificant - for the facies of the areas of the flat seabed with a mobile hydrodynamic regime. The absence of correlation between the parameters was found for the sediments of shoal facies and coastal marine shallow-water closed ones, and for the last the correlation of porosity and residual water saturation was not established due to the lack of data.

Based on the research several conclusions were made. The development of pore and cavernous reservoirs is controlled by the predominant types of rocks – algae limestones. In the Bashkir sediments, among others, the predominant importance belongs to the facies of settlements of various organisms. The correlation analysis for the Bashkir sediments revealed the strongest and most significant relationship of porosity and permeability for the facies of the areas of the flat seabed with a calm hydrodynamic regime, algae settlements and foraminifera settlements, and the relationship between porosity and residual water saturation for the facies of the algae settlements and the areas of the flat seabed with a calm hydrodynamic regime.

References

1. Efimov A.A., Kochneva O.E., Evaluation of the influence of facies affiliation on carbonate deposits’ injectivity of Bashkirskiy layer of Siberian field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 10, pp. 15–19.

2. Mirolyubova E.S., Viskunova K.G., Effect of sedimentation conditions on the formation of reservoir strata in carbonate sediments of the aquatorial part of the Timan-Pechora province (In Russ.), Zapiski Gornogo instituta, 2008, V. 176, pp. 31–35.

3. Nalivkin D.V., Uchenie o fatsiyakh (The doctrine of facies), Moscow: Publ. of USSR AS, 1956.

4. Rukhin L.B., Osnovy obshchey paleogeografii (Fundamentals of general paleogeography), V. 557, Leningrad: Gostoptekhizdat Publ., 1959, 196 p.

5. Krasheninnikov G.F., Uchenie o fatsiyakh (The doctrine of facies), Moscow: Vysshaya shkola Publ., 1971, 388 p.

6. Shcherbakov O.A., Zakonomernosti prostranstvennogo raspredeleniya osadkov v kamennougol'nykh moryakh Zapadnogo Urala (Regularities of spatial distribution of precipitation in the Carboniferous seas of the Western Urals), The collection: Geologiya i geofizika neftegazonosnykh oblastey (Geology and geophysics of oil and gas areas), Ufa, 1982, pp. 83–92.

7. Krinari A.I., About the unification scheme for classification of oil and gas reservoirs (In Russ.), Geologiya nefti i gaza, 1959, no. 7, p. 8.

8. Efimov A.A., Kochneva O.E., Development of predictive models to estimate the oil mobility coefficient with account of facies conditions (on the example of Bsh formation of Batyrbaisky field) (In Russ.), Neftepromyslovoe delo, 2017, no. 1, pp. 20–24.

9. Kochneva O.E., Efimov A.A., Influence of facial features on reservoir properties of the bashkirian carbonate deposits of the Lake field (In Russ.), Vestnik Permskogo universiteta. Geologiya = Bulletin of Perm University. Geology, 2017, V. 16, no. 1, pp. 96–98.

10. Galkin V.I., Efimov A.A., Kochneva O.E., Ya.V. Savitsky. Study of the mobility coefficient dependence on petrophysical characteristics by the example of Bsh layer of Sibirskoye deposit (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 4, pp. 13–15.

11. Efimov A.A., Kochneva O.E., Application of facies peculiarities of carbonate deposits of Sibirsky field to study correlations between porosity and permeability coefficients (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2010, no. 12, pp. 15.


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