4D TEM surveys for waterflood monitoring in a Lower Cambrian carbonate reservoir

UDK: 550.837
DOI: 10.24887/0028-2448-2020-9-30-34
Key words: Osinskian horizon, carbonate reservoir, waterflooding, monitoring of the waterflooding front, Transient electromagnetics (TEM), electroprospecting monitoring, resistivity, Nepa-Botuoba anteclise, Siberian platform
Authors: D.A. Burdakov (Irkutsk Oil Company LLC, RF, Irkutsk), V.N. Sibilev (Irkutsk Oil Company LLC, RF, Irkutsk), O.V. Tokareva (SIGMA-GEO LLC, RF, Irkutsk), V.A. Kolesov (Irkutsk Oil Company LLC, RF, Irkutsk), Yu.A. Agafonov (SIGMA-GEO LLC, RF, Irkutsk)

Complex geology, post-depositional alteration, and physicochemical features of sediments and pore fluids often pose problems to oil carbonate reservoir development planning. Meanwhile, lapse-time (4D) shallow electromagnetic (TEM) surveys may be a good tool to monitor waterflooding used for formation pressure maintaining and oil recovery enhancement in highly resistive carbonate reservoirs. Testing at an area developed by the Irkutsk Oil Company, with regard to key sweep efficiency criteria, has demonstrated good fit of injection volumes inferred from TEM data to real values, based on contrast of resistivity. The forecast of the displacement of the waterflooding front was made for five injection wells. These results have been obtained for the first time for a carbonate reservoir in East Siberia and are useful to enhance petroleum production in the region.

The parameters of the observation network and the intervals of the soundings were determined on the basis of hydrodynamic modeling of the reservoir and synthetic modeling of TEM signals. Three stages of full-scale electrical exploration were carried out. The use of TEM technology made it possible to verify the geological model of the oil reservoir structure and assess the type of prevailing pore space near the injection wells. The results of electrical exploration for predicting the displacement of the waterflooding front were confirmed by water breakthroughs in three production wells.

References

1. Ryzhkov V.I., Razrabotka kriteriev prognoza vysokoproduktivnykh zon v osinskom gorizonte po dannym seysmorazvedki (Development of forecast criteria for highly productive zones in the Osinsky horizon based on seismic data), Moscow: Publ. of Gubkin University, 2018.

2. Wolcott D., Applied waterflood field development, Energy Tribune Publishing, 2009, 417 p.

3. Kolesov V.A., Romantsov A.S., Nazarov D.V., Vtorichnaya pustotnost' karbonatnykh porod – rol' i metody izucheniya (Secondary voidness of carbonate rocks – the role and methods of study), Proceedings of the fifth international conference GeoBaikal’ 2018, Irkutsk, 11–17 August 2018.

4. Mandel'baum M.M., Rabinovich B.I., Surkov V.S., Geofizicheskie metody obnaruzheniya neftegazovykh zalezhey na Sibirskoy platforme (Geophysical methods for detecting oil and gas deposits on the Siberian platform), Moscow: Nedra Publ., 1983, 182 p.

5. Van'yan L.L., Osnovy elektromagnitnykh zondirovaniy (Fundamentals of electromagnetic sounding), Moscow: Nedra Publ., 1965, 109 p.

6. Sharlov M.V., Buddo I.V., Misyurkeeva N.V., Transient electromagnetic surveys for high resolution near-surface exploration: basics and case studies, First break, 2017, V. 35, no 9, pp. 63–71.

7. Pospeev A.V., Buddo I.V., Agafonov Yu.A. et al., Sovremennaya prakticheskaya elektrorazvedka (Modern practical electrical exploration), Novosibirsk: Geo Publ., 2018, 231 p.

8. Zimin S.V., Burdakov D.A., Sibilev V.N. et al., Planirovanie sistemy PPD na primere odnogo iz karbonatnykh mestorozhdeniy kompanii INK (Planning of reservoir pressure maintenance system on the example of one of the carbonate fields of the INK company), Proceedings of the fifth international conference GeoBaikal’ 2018, Irkutsk, 11–17 August 2018.

Complex geology, post-depositional alteration, and physicochemical features of sediments and pore fluids often pose problems to oil carbonate reservoir development planning. Meanwhile, lapse-time (4D) shallow electromagnetic (TEM) surveys may be a good tool to monitor waterflooding used for formation pressure maintaining and oil recovery enhancement in highly resistive carbonate reservoirs. Testing at an area developed by the Irkutsk Oil Company, with regard to key sweep efficiency criteria, has demonstrated good fit of injection volumes inferred from TEM data to real values, based on contrast of resistivity. The forecast of the displacement of the waterflooding front was made for five injection wells. These results have been obtained for the first time for a carbonate reservoir in East Siberia and are useful to enhance petroleum production in the region.

The parameters of the observation network and the intervals of the soundings were determined on the basis of hydrodynamic modeling of the reservoir and synthetic modeling of TEM signals. Three stages of full-scale electrical exploration were carried out. The use of TEM technology made it possible to verify the geological model of the oil reservoir structure and assess the type of prevailing pore space near the injection wells. The results of electrical exploration for predicting the displacement of the waterflooding front were confirmed by water breakthroughs in three production wells.

References

1. Ryzhkov V.I., Razrabotka kriteriev prognoza vysokoproduktivnykh zon v osinskom gorizonte po dannym seysmorazvedki (Development of forecast criteria for highly productive zones in the Osinsky horizon based on seismic data), Moscow: Publ. of Gubkin University, 2018.

2. Wolcott D., Applied waterflood field development, Energy Tribune Publishing, 2009, 417 p.

3. Kolesov V.A., Romantsov A.S., Nazarov D.V., Vtorichnaya pustotnost' karbonatnykh porod – rol' i metody izucheniya (Secondary voidness of carbonate rocks – the role and methods of study), Proceedings of the fifth international conference GeoBaikal’ 2018, Irkutsk, 11–17 August 2018.

4. Mandel'baum M.M., Rabinovich B.I., Surkov V.S., Geofizicheskie metody obnaruzheniya neftegazovykh zalezhey na Sibirskoy platforme (Geophysical methods for detecting oil and gas deposits on the Siberian platform), Moscow: Nedra Publ., 1983, 182 p.

5. Van'yan L.L., Osnovy elektromagnitnykh zondirovaniy (Fundamentals of electromagnetic sounding), Moscow: Nedra Publ., 1965, 109 p.

6. Sharlov M.V., Buddo I.V., Misyurkeeva N.V., Transient electromagnetic surveys for high resolution near-surface exploration: basics and case studies, First break, 2017, V. 35, no 9, pp. 63–71.

7. Pospeev A.V., Buddo I.V., Agafonov Yu.A. et al., Sovremennaya prakticheskaya elektrorazvedka (Modern practical electrical exploration), Novosibirsk: Geo Publ., 2018, 231 p.

8. Zimin S.V., Burdakov D.A., Sibilev V.N. et al., Planirovanie sistemy PPD na primere odnogo iz karbonatnykh mestorozhdeniy kompanii INK (Planning of reservoir pressure maintenance system on the example of one of the carbonate fields of the INK company), Proceedings of the fifth international conference GeoBaikal’ 2018, Irkutsk, 11–17 August 2018.


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