Identifying the type and quantitative assessment of the void space of volcanogenic reservoirs using well logging methods

UDK: 552.3:550.832
DOI: 10.24887/0028-2448-2020-10-37-42
Key words: volcanogenic rocks, identifying of type void space, fractures, caverns, acoustic well logging
Authors: S.V. Dobryden (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen)

The article discusses the structural features of the void space of the rocks of the volcanic-sedimentary sequence of the central zone of the north-eastern framing of the Krasnoleninsky arch. Presented ways of separating rocks by type of void space and quantifying the fracture, pore, and cavern volcanic capacities based on a standard complex of well logging methods. It has been established that the features of the void space of the rocks of the volcanic-sedimentary sequence differ depending on the petrotypes. A combination of a fissure and a cavernous type of voids is characteristic of lava formations - effusive rocks, clastolavas, and lavoclastites. The structure of the void space of pyroclastic formations - tuffs depends on the size of the fragments of their constituents. Agglomerate tuffs differences are characterized by a fissure-cavernous-granular type of voids, ash - granular (pore). The pore type represents the void space of volcanic-sedimentary and sedimentary rocks. According to the data of acoustic, density and neutron logs, based on the relationship between the interval time of longitudinal waves and the density of non-porous minerals, a method for identifying intervals is proposed. The method is adapted for the types of rocks found in the section of the volcanic-sedimentary sequence. The quantitative determination of the fraction of voids types in volcanic rocks is carried out according to the method of V.M. Dobrynin As a result of the petrophysical adjustment using the results of special core investigations for deposits of the volcanic-sedimentary sequence, the theoretical dependences of the interval times of the longitudinal and transverse elastic waves on the coefficient of total porosity are calculated. The selection of tuning factors was made taking into account the structural features of the void space of rocks. It has been established that the effusive differences of volcanic rocks differ from volcaniclastic ones — tuffs, clastolavs, and lavoclastites in terms of the compressibility coefficients of intergranular pores and cavernous voids. An example of separation of rocks from a section of a volcanic-sedimentary sequence according to the type of void space according to a standard complex well logging methods is given. The fracture, intergranular and cavern reservoirs were calculated. The results are confirmed by the data of logging, geological and technological studies of wells and test results. It is shown that the use of the results allows to increase the reliability of the identification of productive intervals of the volcanic-sedimentary sequence.

References

1. Korovina T.A., Kropotova E.P., Romanov E.A., Shadrina S.V., Geologiya i neftenasyshchenie v porodakh triasa Rogozhnikovskogo LU. Regional'nye seysmologicheskie i metodicheskie predposylki uvelicheniya resursnoy bazy nefti, gaza i kondensata, povyshenie izvlekaemosti nefti v Zapadno-Sibirskoy neftegazonosnoy provintsii (Geology and oil saturation in the Triassic rocks of the Rogozhnikovsky license area. Regional seismological and methodological prerequisites for increasing the resource base of oil, gas and condensate, increasing oil recoverability in the West Siberian oil and gas province), Collected papers “Sostoyanie, tendentsii i problemy razvitiya neftegazovogo potentsiala Zapadnoy Sibiri” (The state, trends and problems of the development of oil and gas potential of Western Siberia), Proceedings of mezhdunarodnoy akademicheskoy konferentsii, Tyumen, 11-13 October 2006, Ekaterinburg: Format Publ., 2006, pp. 138–142.

2. Kropotova E.P., Korovina T.A., Romanov E.A., Fedortsov I.V., Sostoyanie izuchennosti i sovremennye vzglyady na stroenie, sostav i perspektivy doyurskikh otlozheniy zapadnoy chasti Surgutskogo rayona (Rogozhnikovskiy litsenzionnyy uchastok) (The state of knowledge and modern views on the structure, composition and prospects of pre-Jurassic deposits of the western part of the Surgut region (Rogozhnikovsky license area)),Proceedings of IX scientific and practical conference “Puti realizatsii neftegazovogo potentsiala KhMAO” (Ways of realization of oil and gas potential of KhMAO), Ekaterinburg: IzdatNaukaServis Publ., 2006, pp. 133–146.

3. Shadrina S.V., Composition, structure, and age of the Pre-Jurassic basement rocks in the north-eastern framing of the Krasnoleninsky anticlinal fold (In Russ.), Geologiya nefti i gaza, 2018, no. 4, pp. 27–33.

4. Karlov A.M., Usmanov I.Sh., Trofimov E.N. et al., Makroizuchenie neftenasyshchennykh vulkanitov doyurskogo kompleksa Sidermskoy ploshchadi Rogozhnikovskogo mestorozhdeniya (Macro-study of oil-saturated volcanics of the pre-Jurassic complex of the Sidermskaya area of the Rogozhnikovskoye field) Proceedings of X scientific and practical conference “Puti realizatsii neftegazovogo potentsiala KhMAO” (Ways of realization of oil and gas potential of KhMAO), Ekaterinburg: IzdatNaukaServis Publ., 2007, pp. 295–307.

5. Pettijohn F.J., Sedimentary rocks, New York, Harper, 1957, 784 p.

6. Frolova Yu.V., Specific features in the composition, structure, and properties of volcaniclastic rocks (In Russ.), Vestnik Moskovskogo universiteta. Ser. 4. Geologiya, 2008, no. 1, pp. 30–38.

7. Frolova Yu.V., Ladygin V.M., Petrophysical transformations of rocks in the Mutnovsky volcanic region (South Kamchatka) under the influence of hydrothermal processes (In Russ.), Vestnik KRAUNTs. Nauki o Zemle, 2008, V. 11, no. 1, pp. 158–170.

8. Shadrina S.V., Kritskiy I.L., The formation of volcanogenic reservoir by hydrothermal fluid  (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 8, pp. 18–21.

9. Glebocheva N.K., Telenkov V.M., Khamatdinova E.R., Effusive reservoir capacity space structure from logs and core (In Russ.), Karotazhnik, 2009, no. 6 (183), pp. 3–10.

10. Dobrynin V.M., Deformatsii i izmeneniya fizicheskikh svoystv kollektorov nefti i gaza (Deformations and changes in the physical properties of oil and gas collectors), Moscow: Nedra Publ., 1970, 239 p.

11.  Ivakin B.N., Karus E.V., Kuznetsov O.L., Akusticheskiy metod issledovaniya skvazhin (Acoustic method of wells research), Moscow: Nedra Publ., 1978, 320 p.

12. Knyazev A.R., Nekrasov A.N., An experience of identification of fractured reservoirs from standard logs and scans (In Russ.), Karotazhnik, 2019, no. 5(299), pp. 40–54.

13. Metodicheskie rekomendatsii po podschetu zapasov nefti i gaza ob’emnym metodom. Otsenka kharaktera nasyshchennosti po dannym GIS (Guidelines for the calculation of reserves of oil and gas by volumetric method. Assessment of the nature of saturation according to well logging): edited by Petersil’e V.I., Poroskun V.I., Yatsenko G.G., Moscow – Tver: Publ. of VNIGNI, 2003. 261 p.

14. Kondakov A.P., Efimov V.A., Dzhamanov A.Sh., Shadrina S.V., Reservoirs identifying in the metamorphic rocks of the southern zone of northeast edge of Krasnoleninskiy dome based on logging, core study and well testing (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 5, pp. 51–56.

15. Kozyar V.F., Kozyar N.V., Basic theory of cavernous capacity evaluation from sonic logs (In Russ.), Karotazhnik, 2016, no. 9(267), pp. 147–155.

The article discusses the structural features of the void space of the rocks of the volcanic-sedimentary sequence of the central zone of the north-eastern framing of the Krasnoleninsky arch. Presented ways of separating rocks by type of void space and quantifying the fracture, pore, and cavern volcanic capacities based on a standard complex of well logging methods. It has been established that the features of the void space of the rocks of the volcanic-sedimentary sequence differ depending on the petrotypes. A combination of a fissure and a cavernous type of voids is characteristic of lava formations - effusive rocks, clastolavas, and lavoclastites. The structure of the void space of pyroclastic formations - tuffs depends on the size of the fragments of their constituents. Agglomerate tuffs differences are characterized by a fissure-cavernous-granular type of voids, ash - granular (pore). The pore type represents the void space of volcanic-sedimentary and sedimentary rocks. According to the data of acoustic, density and neutron logs, based on the relationship between the interval time of longitudinal waves and the density of non-porous minerals, a method for identifying intervals is proposed. The method is adapted for the types of rocks found in the section of the volcanic-sedimentary sequence. The quantitative determination of the fraction of voids types in volcanic rocks is carried out according to the method of V.M. Dobrynin As a result of the petrophysical adjustment using the results of special core investigations for deposits of the volcanic-sedimentary sequence, the theoretical dependences of the interval times of the longitudinal and transverse elastic waves on the coefficient of total porosity are calculated. The selection of tuning factors was made taking into account the structural features of the void space of rocks. It has been established that the effusive differences of volcanic rocks differ from volcaniclastic ones — tuffs, clastolavs, and lavoclastites in terms of the compressibility coefficients of intergranular pores and cavernous voids. An example of separation of rocks from a section of a volcanic-sedimentary sequence according to the type of void space according to a standard complex well logging methods is given. The fracture, intergranular and cavern reservoirs were calculated. The results are confirmed by the data of logging, geological and technological studies of wells and test results. It is shown that the use of the results allows to increase the reliability of the identification of productive intervals of the volcanic-sedimentary sequence.

References

1. Korovina T.A., Kropotova E.P., Romanov E.A., Shadrina S.V., Geologiya i neftenasyshchenie v porodakh triasa Rogozhnikovskogo LU. Regional'nye seysmologicheskie i metodicheskie predposylki uvelicheniya resursnoy bazy nefti, gaza i kondensata, povyshenie izvlekaemosti nefti v Zapadno-Sibirskoy neftegazonosnoy provintsii (Geology and oil saturation in the Triassic rocks of the Rogozhnikovsky license area. Regional seismological and methodological prerequisites for increasing the resource base of oil, gas and condensate, increasing oil recoverability in the West Siberian oil and gas province), Collected papers “Sostoyanie, tendentsii i problemy razvitiya neftegazovogo potentsiala Zapadnoy Sibiri” (The state, trends and problems of the development of oil and gas potential of Western Siberia), Proceedings of mezhdunarodnoy akademicheskoy konferentsii, Tyumen, 11-13 October 2006, Ekaterinburg: Format Publ., 2006, pp. 138–142.

2. Kropotova E.P., Korovina T.A., Romanov E.A., Fedortsov I.V., Sostoyanie izuchennosti i sovremennye vzglyady na stroenie, sostav i perspektivy doyurskikh otlozheniy zapadnoy chasti Surgutskogo rayona (Rogozhnikovskiy litsenzionnyy uchastok) (The state of knowledge and modern views on the structure, composition and prospects of pre-Jurassic deposits of the western part of the Surgut region (Rogozhnikovsky license area)),Proceedings of IX scientific and practical conference “Puti realizatsii neftegazovogo potentsiala KhMAO” (Ways of realization of oil and gas potential of KhMAO), Ekaterinburg: IzdatNaukaServis Publ., 2006, pp. 133–146.

3. Shadrina S.V., Composition, structure, and age of the Pre-Jurassic basement rocks in the north-eastern framing of the Krasnoleninsky anticlinal fold (In Russ.), Geologiya nefti i gaza, 2018, no. 4, pp. 27–33.

4. Karlov A.M., Usmanov I.Sh., Trofimov E.N. et al., Makroizuchenie neftenasyshchennykh vulkanitov doyurskogo kompleksa Sidermskoy ploshchadi Rogozhnikovskogo mestorozhdeniya (Macro-study of oil-saturated volcanics of the pre-Jurassic complex of the Sidermskaya area of the Rogozhnikovskoye field) Proceedings of X scientific and practical conference “Puti realizatsii neftegazovogo potentsiala KhMAO” (Ways of realization of oil and gas potential of KhMAO), Ekaterinburg: IzdatNaukaServis Publ., 2007, pp. 295–307.

5. Pettijohn F.J., Sedimentary rocks, New York, Harper, 1957, 784 p.

6. Frolova Yu.V., Specific features in the composition, structure, and properties of volcaniclastic rocks (In Russ.), Vestnik Moskovskogo universiteta. Ser. 4. Geologiya, 2008, no. 1, pp. 30–38.

7. Frolova Yu.V., Ladygin V.M., Petrophysical transformations of rocks in the Mutnovsky volcanic region (South Kamchatka) under the influence of hydrothermal processes (In Russ.), Vestnik KRAUNTs. Nauki o Zemle, 2008, V. 11, no. 1, pp. 158–170.

8. Shadrina S.V., Kritskiy I.L., The formation of volcanogenic reservoir by hydrothermal fluid  (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 8, pp. 18–21.

9. Glebocheva N.K., Telenkov V.M., Khamatdinova E.R., Effusive reservoir capacity space structure from logs and core (In Russ.), Karotazhnik, 2009, no. 6 (183), pp. 3–10.

10. Dobrynin V.M., Deformatsii i izmeneniya fizicheskikh svoystv kollektorov nefti i gaza (Deformations and changes in the physical properties of oil and gas collectors), Moscow: Nedra Publ., 1970, 239 p.

11.  Ivakin B.N., Karus E.V., Kuznetsov O.L., Akusticheskiy metod issledovaniya skvazhin (Acoustic method of wells research), Moscow: Nedra Publ., 1978, 320 p.

12. Knyazev A.R., Nekrasov A.N., An experience of identification of fractured reservoirs from standard logs and scans (In Russ.), Karotazhnik, 2019, no. 5(299), pp. 40–54.

13. Metodicheskie rekomendatsii po podschetu zapasov nefti i gaza ob’emnym metodom. Otsenka kharaktera nasyshchennosti po dannym GIS (Guidelines for the calculation of reserves of oil and gas by volumetric method. Assessment of the nature of saturation according to well logging): edited by Petersil’e V.I., Poroskun V.I., Yatsenko G.G., Moscow – Tver: Publ. of VNIGNI, 2003. 261 p.

14. Kondakov A.P., Efimov V.A., Dzhamanov A.Sh., Shadrina S.V., Reservoirs identifying in the metamorphic rocks of the southern zone of northeast edge of Krasnoleninskiy dome based on logging, core study and well testing (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 5, pp. 51–56.

15. Kozyar V.F., Kozyar N.V., Basic theory of cavernous capacity evaluation from sonic logs (In Russ.), Karotazhnik, 2016, no. 9(267), pp. 147–155.


Attention!
To buy the complete text of article (a format - PDF) or to read the material which is in open access only the authorized visitors of the website can. .

Mobile applications

Read our magazine on mobile devices

Загрузить в Google play

Press Releases

03.03.2021
25.02.2021
16.02.2021