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The influence of structural and lithological features on the saturation model of Middle Carboniferous reservoirs of the Republic of Bashkortostan

UDK: УДК 553.98(470.57)
Key words: petrophysical classes, limestone, dolomite, oil field, petrophysical model, interpretation model, voids type, volumetric parameters, geophysical surveys, unit, tectonic region
Authors: A.M. Khusainova, T.V. Burikova, O.R. Privalova (BashNIPI-neft LLC, RF, Ufa), A.N. Nugaeva, R.I. Zianberdin (Bashneft-Dobycha LLC, RF, Ufa)
The article describes the developed unified interpretation model, individually approaching each middle Carboniferous object and able to highlight the geological characteristics of rocks, influencing the formation of void space and hence hydrocarbon saturation. Detailed lithological and petrographic study of middle Carboniferous rocks allowed identifying the main lithotypes for each stratigraphic unit. Facies conditions of rock formation and characteristics of sedimentation basin at different period of time were considered in lithotype determination. This approach allowed us to separate the rocks by their petrophysical parameters, and to justify the petrophysical classes determination by geological features of middle Carboniferous section. Petrophysical models were developed based on the results of all currently available capillarimetry studies of middle Carboniferous deposits of the Northern part of Bashkortostan. PLT data were used in studying the lithological composition and they help to determine the mineralogical composition. To analyze pore space structure of the pore space in addition to indirect methods such as acoustic and traditional methods – thin sections study, we used special methods such as tomography that helped us to justify the typification of rocks according to pore space structure. We arranged 7 petrophysical classes: 4 for limestone and 3 for dolomite. Based on petrophysical model there were created an interpretative model including lithologic differentiation of the section (dolomite, limestone, shale), reservoir determining and key logging parameters. Application of these dependencies confined to a certain study area, allows approximating estimated log parameters to core data of the fields on the territory of the Republic of Bashkortostan.
References
1. Bulgakov R.B., Nekotorye rezul'taty raboty opytno-metodicheskoy partii
no. 22 (Some results of the test survey crew no. 22 work), Collected papers
“Geologicheskaya sluzhba i gornoe delo Bashkortostana na rubezhe vekov”
(Bashkortostan geological survey and mining on the turn of the century), Proceedings
of Republican scientific and practical conference, Ufa: Publ. of
TAU, 2000, pp. 244–250.
2. Bulgakov R.B., Privalova O.R. , Nekotorye voprosy kachestva petrofizicheskikh
issledovaniy kerna iz kollektorov (Some questions the quality of petrophysical
studies of the core of collectors), Proceedings of “Novye geofizicheskie
tekhnologii dlya neftegazovoy promyshlennosti” (New geophysical
technology for the oil and gas industry), Ufa: Publ. of NPF Geofizika, 2003,
pp. 85–87.
3. Lozin E.V., Masagutov R.Kh., Minkaev V.N., Stroenie i evolyutsiya osadochnogo
chekhla platformennoy Bashkirii v svyazi s zakonomernostyami
razmeshcheniya zalezhey nefti i gaza (Structure and evolution of the sedimentary
cover of platform Bashkortostan in connection with the laws of placing
of oil and gas deposits), Ufa, 1989, 338 p.
4. Vissarionova A.Ya., Stratigrafiya i fatsii sredne-nizhnekamennougol'nykh otlozheniy
Bashkirii i ikh neftenosnost' (Stratigraphy and facies of Medium and
Lower Carboniferous deposits of Bashkortostan and its oil content), Moscow,
1959, 222 p.
5. Dakhnov V.N., Geofizicheskie metody opredeleniya kollektorskikh svoystv i
neftegazonasyshcheniya gornykh porod (Geophysical methods for the determination
of reservoir properties and oil and gas saturation of rocks),
Moscow: Nedra Publ., 1975, 343 pp.
6. Dobrynin V.M., Vendel’shteyn B.Yu., Kozhevnikov D.A., Petrofizika (Fizika
gornykh porod) (Petrophysics (Physics of rocks)): edited Kozhevnikov D.A.,
Moscow: Neft’ I gaz Publ., 2004, 368 p.
7. 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.
8. Tauzhnyanskiy G.V., Sokolovskaya O.A., Rumak N.P., Selivanova E.E., Petrophysical
reasoning of determining the oil and gas saturation factor of reservoirs
in Western Siberia (In Russ.), Karotazhnik, 2002, V. 101, pp. 35–45.
The article describes the developed unified interpretation model, individually approaching each middle Carboniferous object and able to highlight the geological characteristics of rocks, influencing the formation of void space and hence hydrocarbon saturation. Detailed lithological and petrographic study of middle Carboniferous rocks allowed identifying the main lithotypes for each stratigraphic unit. Facies conditions of rock formation and characteristics of sedimentation basin at different period of time were considered in lithotype determination. This approach allowed us to separate the rocks by their petrophysical parameters, and to justify the petrophysical classes determination by geological features of middle Carboniferous section. Petrophysical models were developed based on the results of all currently available capillarimetry studies of middle Carboniferous deposits of the Northern part of Bashkortostan. PLT data were used in studying the lithological composition and they help to determine the mineralogical composition. To analyze pore space structure of the pore space in addition to indirect methods such as acoustic and traditional methods – thin sections study, we used special methods such as tomography that helped us to justify the typification of rocks according to pore space structure. We arranged 7 petrophysical classes: 4 for limestone and 3 for dolomite. Based on petrophysical model there were created an interpretative model including lithologic differentiation of the section (dolomite, limestone, shale), reservoir determining and key logging parameters. Application of these dependencies confined to a certain study area, allows approximating estimated log parameters to core data of the fields on the territory of the Republic of Bashkortostan.
References
1. Bulgakov R.B., Nekotorye rezul'taty raboty opytno-metodicheskoy partii
no. 22 (Some results of the test survey crew no. 22 work), Collected papers
“Geologicheskaya sluzhba i gornoe delo Bashkortostana na rubezhe vekov”
(Bashkortostan geological survey and mining on the turn of the century), Proceedings
of Republican scientific and practical conference, Ufa: Publ. of
TAU, 2000, pp. 244–250.
2. Bulgakov R.B., Privalova O.R. , Nekotorye voprosy kachestva petrofizicheskikh
issledovaniy kerna iz kollektorov (Some questions the quality of petrophysical
studies of the core of collectors), Proceedings of “Novye geofizicheskie
tekhnologii dlya neftegazovoy promyshlennosti” (New geophysical
technology for the oil and gas industry), Ufa: Publ. of NPF Geofizika, 2003,
pp. 85–87.
3. Lozin E.V., Masagutov R.Kh., Minkaev V.N., Stroenie i evolyutsiya osadochnogo
chekhla platformennoy Bashkirii v svyazi s zakonomernostyami
razmeshcheniya zalezhey nefti i gaza (Structure and evolution of the sedimentary
cover of platform Bashkortostan in connection with the laws of placing
of oil and gas deposits), Ufa, 1989, 338 p.
4. Vissarionova A.Ya., Stratigrafiya i fatsii sredne-nizhnekamennougol'nykh otlozheniy
Bashkirii i ikh neftenosnost' (Stratigraphy and facies of Medium and
Lower Carboniferous deposits of Bashkortostan and its oil content), Moscow,
1959, 222 p.
5. Dakhnov V.N., Geofizicheskie metody opredeleniya kollektorskikh svoystv i
neftegazonasyshcheniya gornykh porod (Geophysical methods for the determination
of reservoir properties and oil and gas saturation of rocks),
Moscow: Nedra Publ., 1975, 343 pp.
6. Dobrynin V.M., Vendel’shteyn B.Yu., Kozhevnikov D.A., Petrofizika (Fizika
gornykh porod) (Petrophysics (Physics of rocks)): edited Kozhevnikov D.A.,
Moscow: Neft’ I gaz Publ., 2004, 368 p.
7. 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.
8. Tauzhnyanskiy G.V., Sokolovskaya O.A., Rumak N.P., Selivanova E.E., Petrophysical
reasoning of determining the oil and gas saturation factor of reservoirs
in Western Siberia (In Russ.), Karotazhnik, 2002, V. 101, pp. 35–45.


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