Risk reducing of oil and gas exploration due to integration of geoelectric surveys and seismic data on the territory of the Yurubchen-Tokhomo zone

UDK: УДК 550.83.05
DOI: DOI: 10.24887/0028-2448-2021-11-82-87
Key words: integration of methods, geoelectric prospecting, seismic, Eastern Siberia, Riphean, Archaean, basement, Baykit anteclise
Authors: A.A. Koziaev1, K.O. Matrosov1, S.V. Naumov2, E.A. Skovyro2, R.S. Melnikov3, N.M. Kutukova3, O.V. Tokareva4, A.I. Ilyin4 1RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk 2Slavneft-Krasnoyarskneftegas LLC, RF, Krasnoyarsk 3Rosneft Oil Company, RF, Moscow 4SIGMA-GEO LLC, RF, Irkutsk

The article presents the results of increasing the efficiency of geological exploration at one of the key clusters of Rosneft Oil Company in Eastern Siberia. The increase in the efficiency of work is ensured due to the integration of field geophysical methods - geoelectric prospecting and vintage 2D seismic data. This allowed not only to significantly reduce the geological risks associated with the unique geology of the region, but also to reduce the cost of exploration.

The paper presents a brief description of the geological structure of the Yurubchen-Tokhomo oil and gas accumulation zone. As well as, the paper describes the main difficulties in separating Riphean sediments from the basement rocks based on vintage 2D seismic data. It is proposed to combine the seismic CDP method and the TEM method to separate the Riphean terrigenous-carbonate sediments from the basement granitoids. In addition, the paper describes the theoretical prerequisites of the TEM method using resistivity for the separation of the Riphean sedimentary rocks from the intrusive basement rocks. The integration of the methods are justified by using numerical modeling and the results of the analysis of well logging data. An approach to the complex analysis of the two methods at the qualitative level is demonstrated. This approach allows to greatly decrease the main limitations of each of the methods, thereby increasing the reliability of the data interpretation results, the success of subsequent exploration and reducing the risks of drilling into the unproductive basement rocks. The resulting geological model is fully consistent with the drilling results, which could not be achieved by only using the vintage 2D seismic data. A quantitative assessment of the change in the probability of geological success and an assessment of the value of information (VOI) obtained as a result of integration were carried out.

References

1. Mel'nikov N.V., Mel'nikov P.N., Smirnov E.V., The petroleum accumulation zones in the geological-prospecting regions of the Lena-Tunguska province (In Russ.), Geologiya i geofizika = Russian Geology and Geophysics, 2011, V. 52, no. 8, pp. 1151–1163.

2. Trofimuk A.A., Kuyumbo-Yurubcheno-Tayginskoe gazoneftyanoe mestorozhdenie supergigant Krasnoyarskogo kraya. Osnovy tekhniko-ekonomicheskogo obosnovaniya razrabotki (The Kuyumbo-Yurubcheno-Taiginskoye gas and oil field is a supergiant in the Krasnoyarsk Territory. Basics of a feasibility study for development), Novosibirsk: Publ. of OIGGM, 1992, 60 p.

3. Filiptsov Yu.A., Neftegazonosnost' verkhnego proterozoya zapadnoy chasti Sibirskoy platformy (Oil and gas content of the upper Proterozoic in the western part of the Siberian platform): thesis of doctor of geological and mineralogical science, Krasnoyarsk, 2015.

4. Tikhonova K.A., Kozyaev A.A., Nazarov D.V. et al., Multi-disciplinary approach for identifying and forecasting high-porosity vuggy zones in the Riphean reservoir of the Yurubcheno-Tokhomskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 12, pp. 74–79, DOI: 10.24887/0028-2448-2020-12-74-79

5. Kharakhinov V.V., Shlenkin S.I., Neftegazonosnost' dokembriyskikh tolshch Vostochnoy Sibiri na primere Kuyumbinsko-Yurubcheno-Tokhomskogo areala neftegonakopleniya (Oil and gas potential of the Precambrian strata of Eastern Siberia on the example of the Kuyumbinsky-Yurubcheno-Tokhomsky oil accumulation area), Moscow: Nauchnyy mir, 2011, 420 p.

6. Votintsev A.N., Krasil'nikova N.B., Oil and gas occurrence of the Siberian platform basement within the Kamovsky arch of the Baikitsky anteclise (In Russ.), Geologiya nefti i gaza = Russian Geology and Geophysics, 2019, no. 2, pp. 55–62.

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. Mostovoy P.Ya., Shakirzyanov L.N., Ostankov A.V. et al., Decision making practice of applying electromagnetic surveys in different geological areas and geophysical conditions (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 2, pp. 26–30, DOI: 10.24887/0028-2448-2021-2-26-30

9. Antonov E.Yu., Matematicheskoe modelirovanie kvazistatsionarnykh elektromagnitnykh poley v dispergiruyushchikh i magnitnykh sredakh (Mathematical modeling of quasi-stationary electromagnetic fields in dispersive and magnetic media): thesis of doctor of physical and mathematical science, Novosibirsk, 2011.

10. Bratvold R.B., Bickel E.J., Lohne H.P., Value of information: the past, present, and future, SPE-110378-PA, 2009, DOI: https://doi.org/10.2118/110378-MS.

11. Sitnikov A.N., Butorin A.V., Timoshenko G.M., Vashevnik A.M., Application of Value of Information approach to seismic data for decreasing well drilling risks (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 12, pp. 40–43.

The article presents the results of increasing the efficiency of geological exploration at one of the key clusters of Rosneft Oil Company in Eastern Siberia. The increase in the efficiency of work is ensured due to the integration of field geophysical methods - geoelectric prospecting and vintage 2D seismic data. This allowed not only to significantly reduce the geological risks associated with the unique geology of the region, but also to reduce the cost of exploration.

The paper presents a brief description of the geological structure of the Yurubchen-Tokhomo oil and gas accumulation zone. As well as, the paper describes the main difficulties in separating Riphean sediments from the basement rocks based on vintage 2D seismic data. It is proposed to combine the seismic CDP method and the TEM method to separate the Riphean terrigenous-carbonate sediments from the basement granitoids. In addition, the paper describes the theoretical prerequisites of the TEM method using resistivity for the separation of the Riphean sedimentary rocks from the intrusive basement rocks. The integration of the methods are justified by using numerical modeling and the results of the analysis of well logging data. An approach to the complex analysis of the two methods at the qualitative level is demonstrated. This approach allows to greatly decrease the main limitations of each of the methods, thereby increasing the reliability of the data interpretation results, the success of subsequent exploration and reducing the risks of drilling into the unproductive basement rocks. The resulting geological model is fully consistent with the drilling results, which could not be achieved by only using the vintage 2D seismic data. A quantitative assessment of the change in the probability of geological success and an assessment of the value of information (VOI) obtained as a result of integration were carried out.

References

1. Mel'nikov N.V., Mel'nikov P.N., Smirnov E.V., The petroleum accumulation zones in the geological-prospecting regions of the Lena-Tunguska province (In Russ.), Geologiya i geofizika = Russian Geology and Geophysics, 2011, V. 52, no. 8, pp. 1151–1163.

2. Trofimuk A.A., Kuyumbo-Yurubcheno-Tayginskoe gazoneftyanoe mestorozhdenie supergigant Krasnoyarskogo kraya. Osnovy tekhniko-ekonomicheskogo obosnovaniya razrabotki (The Kuyumbo-Yurubcheno-Taiginskoye gas and oil field is a supergiant in the Krasnoyarsk Territory. Basics of a feasibility study for development), Novosibirsk: Publ. of OIGGM, 1992, 60 p.

3. Filiptsov Yu.A., Neftegazonosnost' verkhnego proterozoya zapadnoy chasti Sibirskoy platformy (Oil and gas content of the upper Proterozoic in the western part of the Siberian platform): thesis of doctor of geological and mineralogical science, Krasnoyarsk, 2015.

4. Tikhonova K.A., Kozyaev A.A., Nazarov D.V. et al., Multi-disciplinary approach for identifying and forecasting high-porosity vuggy zones in the Riphean reservoir of the Yurubcheno-Tokhomskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 12, pp. 74–79, DOI: 10.24887/0028-2448-2020-12-74-79

5. Kharakhinov V.V., Shlenkin S.I., Neftegazonosnost' dokembriyskikh tolshch Vostochnoy Sibiri na primere Kuyumbinsko-Yurubcheno-Tokhomskogo areala neftegonakopleniya (Oil and gas potential of the Precambrian strata of Eastern Siberia on the example of the Kuyumbinsky-Yurubcheno-Tokhomsky oil accumulation area), Moscow: Nauchnyy mir, 2011, 420 p.

6. Votintsev A.N., Krasil'nikova N.B., Oil and gas occurrence of the Siberian platform basement within the Kamovsky arch of the Baikitsky anteclise (In Russ.), Geologiya nefti i gaza = Russian Geology and Geophysics, 2019, no. 2, pp. 55–62.

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. Mostovoy P.Ya., Shakirzyanov L.N., Ostankov A.V. et al., Decision making practice of applying electromagnetic surveys in different geological areas and geophysical conditions (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 2, pp. 26–30, DOI: 10.24887/0028-2448-2021-2-26-30

9. Antonov E.Yu., Matematicheskoe modelirovanie kvazistatsionarnykh elektromagnitnykh poley v dispergiruyushchikh i magnitnykh sredakh (Mathematical modeling of quasi-stationary electromagnetic fields in dispersive and magnetic media): thesis of doctor of physical and mathematical science, Novosibirsk, 2011.

10. Bratvold R.B., Bickel E.J., Lohne H.P., Value of information: the past, present, and future, SPE-110378-PA, 2009, DOI: https://doi.org/10.2118/110378-MS.

11. Sitnikov A.N., Butorin A.V., Timoshenko G.M., Vashevnik A.M., Application of Value of Information approach to seismic data for decreasing well drilling risks (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 12, pp. 40–43.



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