Features of 3D data processing in solving complex problems confined to the gas anomalies of Sakhalin Shelf

UDK: 550.834.05(204.1)
DOI: 10.24887/0028-2448-2019-4-28-32
Key words: 3D seismic data, signal processing, multiple wave, ghost wave, depth-velocity model building, pre-stack migration, gas anomalies, seismic and geological modeling
Authors: A.B. Popova(Arctic Research Centre LLC, RF, Moscow), S.V. Gorbachev (RN-Shelf Arctic LLC, RF , Moscow), M.A. Samarkin (Rosneft Oil Company, RF, Moscow), E.A. Kurin (GEOLAB LLC, RF, Moscow)

In this article presents the results of processing 3D seismic data obtained at one of the license blocks of Rosneft Oil Company, located on the shelf of the Sea of Okhotsk, showing that the use of modern multiple waves suppression algorithms and spreading of the frequency spectrum in the processing graph improve the traceability and dynamic expression reflecting horizons. The presence of anomalies associated with gas-saturated layer complicates the building of a seismic image and the interpretation of data in these areas. "Gas" anomalies are characterized by a low amplitude, deflection and discontinuity of the axes of synphase, impair the dynamics of seismic reflections, affect the structural factor, creating the so-called "shadow areas". In this material there are two types of such anomalies. These are thick and extensive gas-saturated layers and a practically vertical “pillar” in the center of the northern dome of the field. To solve this problem, seismic geological modeling was applied. It allowed to form an idea of the effect of such anomalies on seismic data and correctly compensate for this influence when building the depth-velocity model and the seismic image of the studied area. The developed graph of 3D data processing, aimed at solving all the above problems, allowed us to obtain final data with preservation of relative true amplitudes for dynamic analysis and with good traceability of reflecting horizons for structural analysis.

References

1. Kharakhinov V.V., Neftegazovaya geologiya Sakhalinskogo regiona (Petroleum geology of the Sakhalin region), Moscow: Nauchnyy mir Publ., 2010, 276 p.

2. Denisov M.S., Kobzov A.A., Muzychenko E.L. et al., Developing a multiple elimination methodology with examples from Barents and Kara seas (In Russ.), Tekhnologii seysmorazvedki, 2017, no. 1, pp. 5–12.

3. Berryhill J.R., Kim Y.C., Deep-water peg legs and multiples: Emulation and suppression, Geophysics, 1986, V. 51, pp. 2177–2184.

4. Verschuur D.J., Berkhout A.J., Estimation of multiple scattering by iterative inversion, Part II. Practical aspects and examples, Geophysics, 1997, V. 62, pp. 1596–1611.

5. Filimonov A.V., Gorbachev S.V., Myasoedov N.K., Broadband processing of 3D seismic data on the example of the Black Sea shelf (In Russ.), Vestnik Rosneftʹ, 2016, no. 4, pp. 36–39.

6. Gorbachev S.V., Yakovlev A.P., Simulation of seismic surveys - a tool to improve the effectiveness of seismic exploration (In Russ.), Oil & Gas Journal Russia, 2011, no. 10 (54), pp. 84–87.

7. Biondi B., Palacharla G., 3-D prestack migration of common-azimuth data: Geophysics, Soc. of Expl. Gephys., 1996, V. 61, pp. 1822–1832.

In this article presents the results of processing 3D seismic data obtained at one of the license blocks of Rosneft Oil Company, located on the shelf of the Sea of Okhotsk, showing that the use of modern multiple waves suppression algorithms and spreading of the frequency spectrum in the processing graph improve the traceability and dynamic expression reflecting horizons. The presence of anomalies associated with gas-saturated layer complicates the building of a seismic image and the interpretation of data in these areas. "Gas" anomalies are characterized by a low amplitude, deflection and discontinuity of the axes of synphase, impair the dynamics of seismic reflections, affect the structural factor, creating the so-called "shadow areas". In this material there are two types of such anomalies. These are thick and extensive gas-saturated layers and a practically vertical “pillar” in the center of the northern dome of the field. To solve this problem, seismic geological modeling was applied. It allowed to form an idea of the effect of such anomalies on seismic data and correctly compensate for this influence when building the depth-velocity model and the seismic image of the studied area. The developed graph of 3D data processing, aimed at solving all the above problems, allowed us to obtain final data with preservation of relative true amplitudes for dynamic analysis and with good traceability of reflecting horizons for structural analysis.

References

1. Kharakhinov V.V., Neftegazovaya geologiya Sakhalinskogo regiona (Petroleum geology of the Sakhalin region), Moscow: Nauchnyy mir Publ., 2010, 276 p.

2. Denisov M.S., Kobzov A.A., Muzychenko E.L. et al., Developing a multiple elimination methodology with examples from Barents and Kara seas (In Russ.), Tekhnologii seysmorazvedki, 2017, no. 1, pp. 5–12.

3. Berryhill J.R., Kim Y.C., Deep-water peg legs and multiples: Emulation and suppression, Geophysics, 1986, V. 51, pp. 2177–2184.

4. Verschuur D.J., Berkhout A.J., Estimation of multiple scattering by iterative inversion, Part II. Practical aspects and examples, Geophysics, 1997, V. 62, pp. 1596–1611.

5. Filimonov A.V., Gorbachev S.V., Myasoedov N.K., Broadband processing of 3D seismic data on the example of the Black Sea shelf (In Russ.), Vestnik Rosneftʹ, 2016, no. 4, pp. 36–39.

6. Gorbachev S.V., Yakovlev A.P., Simulation of seismic surveys - a tool to improve the effectiveness of seismic exploration (In Russ.), Oil & Gas Journal Russia, 2011, no. 10 (54), pp. 84–87.

7. Biondi B., Palacharla G., 3-D prestack migration of common-azimuth data: Geophysics, Soc. of Expl. Gephys., 1996, V. 61, pp. 1822–1832.



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