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Statistical parameter of the double electric layer as an indicator of oil-saturation of the Lower-Middle Jurassic formation (Tomsk region)

UDK: 550.832
DOI: 10.24887/0028-2448-2018-10-24-26
Key words: geophysical surveys, increment of hydrocarbon reserves, double electric layer, statistical interpretation of well logging data, low-resistance productive reservoir, Lower-Middle Jurassic horizon, hard-to-recover resource
Authors: I.A. Melnik (Tomsk Branch of Siberian Research Institute of Geology, Geophysics and Mineral Resources JSC, RF, Tomsk), I.V. Sharf (Tomsk Polytechnic University, RF, Tomsk), M.P. Ivanova (Tomsk Polytechnic University, RF, Tomsk)

At present, one of the strategic objectives is to develop hard-to-recover hydrocarbon reserves in Western Siberia which include, along with Bazhenov, Lower and Middle Jurassic formations. Due to high uncertainty of initial parameters, standard methods of resource exploration and evaluation are not sufficiently effective. Therefore, development of hard-to-recover oil and gas reserves located in low permeable reservoirs, Tyumen and Urman in particular, implies development and implementation of new technological approaches to resource prospecting and production.

The relevance of the work is associated with the task to increase the increment of hydrocarbon reserve based on innovative technologies – statistical interpretation of old data of geophysical surveys. The purpose of the article is to analyze the relationship between secondary process of double electric layer formation in the argillaceous facies and oil-saturation of tight sand reservoir in the Lower-Middle Jurassic formation of Tomsk region. As an instrument to determine intensity of the secondary processes in tight sand reservoirs of Lower and Middle Jurassic, a new method of statistical interpretation of well logging data has been applied. Intensive secondary processes serve as indicators of hydrocarbon occurrence. Paragenesis of superimposed processes of pyritization, kaolinitization, and formation of surface conductivity in argillaceous cement in sandy intervals indicates their hydrocarbon saturation. The mathematical apparatus of estimating the perspective in reproduction of hydrocarbon resource and profitability of well logging statistical interpretation are presented. Economic feasibility and effectiveness of this technology is shown.

References

1. Gert A., Germakhanov A., Goncharov I. et al., Hard to recover reserves of the Tomsk region. Directions for accelerated study and involvement in operation (In Russ.), Oil&Gas Journal Russia, 2015, no. 7, pp. 30–37.

2. Nedolivko N.M., Ezhova A.V., Perevertaylo T.G., Polumogina E.D., The role of disjunctive tectonics in the formation of a void space in the reservoirs of the Yu13 seam of the Western Moisei section of the Dvurechensk oil field (Tomsk Region) (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta = Bulletin of the Tomsk Polytechnic University, 2005, V. 308, no. 5, pp. 47–53.

3. Predtechenskaya E.A., Shiganova O.V., Fomichev A.S., Catagenetic and hydrochemical anomalies in Lower-Middle Jurassic oil-and-gas bearing deposits in West Siberia as indicators of fluid-dynamic processes in disjunctive dislocation zones (In Russ.), Litosfera, 2009, no. 6, pp. 54–65.

4. Mel'nik I.A., Technology of increase information data geophysical researches with the purpose of allocation of zones imposed epigenesist in sandstones-collectors (In Russ.), Vestnik Tomskogo gosudarstvennogo universiteta, 2007, no. 12, pp. 223–227.

5. Mel'nik I.A., Opredelenie intensivnosti geokhimicheskikh protsessov po materialam geofizicheskikh issledovaniy skvazhin (Estimates of the intensity of geochemical processes using well logging data), Novosibirsk: Publ. of SNIIGGiMS, 2016, 146 p.

6. Mel'nik I.A., Smirnova K.Yu., Zimina S.V. et al., Geological structure, stratigraphy and perspectives of oil and gas potential in the Low-Middle Jurassic deposits in Tomsk Region (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov = Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2015, V. 326, no. 11, pp. 20–30.

7. Lebedev B.A., Geokhimiya epigeneticheskikh protsessov v osadochnykh basseynakh (Geochemistry of epigenetic processes in sedimentary basins), Leningrad: Nedra Publ., 1992, 239 p.

8. Zubkov M.Yu., Crystallographic and lithological and petrographical basis of iron minerals, clays and terrigenous reservoirs electrical properties (by the example of BV8 and UV1 strata of Povkhovskoye field) (In Russ.), Part 1, Gornye vedomosti, 2008, no. 11, pp. 20–32.

9. Zubkov M.Yu. Crystallographic and lithological and petrographical basis of iron minerals, clays and terrigenous reservoirs electrical properties (by the example of BV8 and UV1 strata of Povkhovskoye field) (In Russ.), Part 2, Gornye vedomosti, 2008, no. 12, pp. 30-53.

10. Chepikov K.R., Ermolova E.P., Orlova N.A., Epigenetic minerals as indicators of the time of arrival of oil in sandy industrial reservoirs (In Russ.), Doklady AN SSSR, 1959, V. 125, no. 5, pp. 1097–1099.

At present, one of the strategic objectives is to develop hard-to-recover hydrocarbon reserves in Western Siberia which include, along with Bazhenov, Lower and Middle Jurassic formations. Due to high uncertainty of initial parameters, standard methods of resource exploration and evaluation are not sufficiently effective. Therefore, development of hard-to-recover oil and gas reserves located in low permeable reservoirs, Tyumen and Urman in particular, implies development and implementation of new technological approaches to resource prospecting and production.

The relevance of the work is associated with the task to increase the increment of hydrocarbon reserve based on innovative technologies – statistical interpretation of old data of geophysical surveys. The purpose of the article is to analyze the relationship between secondary process of double electric layer formation in the argillaceous facies and oil-saturation of tight sand reservoir in the Lower-Middle Jurassic formation of Tomsk region. As an instrument to determine intensity of the secondary processes in tight sand reservoirs of Lower and Middle Jurassic, a new method of statistical interpretation of well logging data has been applied. Intensive secondary processes serve as indicators of hydrocarbon occurrence. Paragenesis of superimposed processes of pyritization, kaolinitization, and formation of surface conductivity in argillaceous cement in sandy intervals indicates their hydrocarbon saturation. The mathematical apparatus of estimating the perspective in reproduction of hydrocarbon resource and profitability of well logging statistical interpretation are presented. Economic feasibility and effectiveness of this technology is shown.

References

1. Gert A., Germakhanov A., Goncharov I. et al., Hard to recover reserves of the Tomsk region. Directions for accelerated study and involvement in operation (In Russ.), Oil&Gas Journal Russia, 2015, no. 7, pp. 30–37.

2. Nedolivko N.M., Ezhova A.V., Perevertaylo T.G., Polumogina E.D., The role of disjunctive tectonics in the formation of a void space in the reservoirs of the Yu13 seam of the Western Moisei section of the Dvurechensk oil field (Tomsk Region) (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta = Bulletin of the Tomsk Polytechnic University, 2005, V. 308, no. 5, pp. 47–53.

3. Predtechenskaya E.A., Shiganova O.V., Fomichev A.S., Catagenetic and hydrochemical anomalies in Lower-Middle Jurassic oil-and-gas bearing deposits in West Siberia as indicators of fluid-dynamic processes in disjunctive dislocation zones (In Russ.), Litosfera, 2009, no. 6, pp. 54–65.

4. Mel'nik I.A., Technology of increase information data geophysical researches with the purpose of allocation of zones imposed epigenesist in sandstones-collectors (In Russ.), Vestnik Tomskogo gosudarstvennogo universiteta, 2007, no. 12, pp. 223–227.

5. Mel'nik I.A., Opredelenie intensivnosti geokhimicheskikh protsessov po materialam geofizicheskikh issledovaniy skvazhin (Estimates of the intensity of geochemical processes using well logging data), Novosibirsk: Publ. of SNIIGGiMS, 2016, 146 p.

6. Mel'nik I.A., Smirnova K.Yu., Zimina S.V. et al., Geological structure, stratigraphy and perspectives of oil and gas potential in the Low-Middle Jurassic deposits in Tomsk Region (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov = Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2015, V. 326, no. 11, pp. 20–30.

7. Lebedev B.A., Geokhimiya epigeneticheskikh protsessov v osadochnykh basseynakh (Geochemistry of epigenetic processes in sedimentary basins), Leningrad: Nedra Publ., 1992, 239 p.

8. Zubkov M.Yu., Crystallographic and lithological and petrographical basis of iron minerals, clays and terrigenous reservoirs electrical properties (by the example of BV8 and UV1 strata of Povkhovskoye field) (In Russ.), Part 1, Gornye vedomosti, 2008, no. 11, pp. 20–32.

9. Zubkov M.Yu. Crystallographic and lithological and petrographical basis of iron minerals, clays and terrigenous reservoirs electrical properties (by the example of BV8 and UV1 strata of Povkhovskoye field) (In Russ.), Part 2, Gornye vedomosti, 2008, no. 12, pp. 30-53.

10. Chepikov K.R., Ermolova E.P., Orlova N.A., Epigenetic minerals as indicators of the time of arrival of oil in sandy industrial reservoirs (In Russ.), Doklady AN SSSR, 1959, V. 125, no. 5, pp. 1097–1099.



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