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Upcoming events

Oklahoma History Center

Events

Upcoming events

    • 28 Jan 2019
    • 11:30 AM - 1:00 PM
    Register

    Nibrara Surface Seismic Data - Resolution Enhancement and Reservoir Characterization Through Wavefield Re-Datuming and Inversion


    Dr. Jyoti Behura

    Seismic Science



    Abstract

    Knowledge and utilization of in-situ stress and fracture distributions in the subsurface determine the operational success in most unconventional plays. Besides stress and fracture distributions, seismic attributes derived from amplitude-variation-with-offset (AVO), velocity, and attenuation analyses play key roles in the characterization and development of these plays.

    In this case study of the Niobrara, we use only the surface seismic data to decipher the stress distribution from azimuthal velocity analysis, fracture orientation and rock properties from azimuthal AVO inversion, and fault properties through attenuation inversion. Because the robustness and accuracy of the above attributes are extremely sensitive to the overburden effects, we utilize a novel re-datuming technique to eliminate all effects of overburden. The re-datumed common-offset common-azimuth (COCA) gathers clearly show azimuthal moveout (related to in-situ stress distribution). The re-datuming also generates high-resolution gathers and enhances the signal-to-noise ratio which should help in geo-steering and in possibly distinguishing Niobrara and Codell formations.

    The azimuthal velocity analysis yields the direction of Vfast that corresponds to the direction of maximum stress. The study shows that this direction for the Niobrara-Codell formations in the Vogl area is predominantly W-E and WSW-ENE. The attenuation attribute shows that the regional fault oriented N-S within the Vogl area is of significantly lower attenuation compared to the surroundings. The most likely explanation for such low attenuation is that the fault has undergone calcite mineralization and is therefore sealing. Such an inference has major implications for not only field development but also for environmental impact of hydraulic fracturing because this regional fault would not conduct hydraulic-fracturing fluids to the surface. The AVO attributes show a distinct change across the regional fault which again points to the possibility of the fault being sealing. Such a contrast might arise from differences in pore-pressure or in lithology. Moreover, the AVAZ attribute is similar to the Vfast direction which indicates that the dominant fracture direction coincides with the in-situ maximum horizontal stress direction.


    • 25 Feb 2019
    • 11:30 AM - 1:00 PM
    Registration is closed

    To Be Announced

    • 26 Mar 2019
    • 11:30 AM - 7:00 PM
    Registration is closed

    To Be Announced

    • 15 Apr 2019
    • 11:30 AM - 1:00 PM
    Registration is closed

    To Be Announced

    • 20 May 2019
    • 5:30 PM - 9:00 PM
    Registration is closed

    To Be Announced

Past events

17 Dec 2018 GSOC Holiday Party
26 Nov 2018 November Technical Luncheon
22 Oct 2018 October Luncheon
18 Sep 2018 2018 GSOC Annual Golf Tournament
17 Sep 2018 SEG Honorary Lecture - September Luncheon
21 May 2018 2018 Annual Spouse and Awards Night
16 Apr 2018 April Technical Luncheon
20 Mar 2018 2018 Continuing Education and Shrimp Boil
26 Feb 2018 February Technical Luncheon
22 Jan 2018 January Technical Luncheon
18 Dec 2017 2017 Holiday Party
06 Nov 2017 SEG Honorary Lecturer Mirko van der Baan
24 Oct 2017 2017 GSOC Annual Golf Tournament
23 Oct 2017 October luncheon
18 Sep 2017 September luncheon: Dr. Mark Mack Sigma3
22 May 2017 2017 Annual Spouse and Awards Night
24 Apr 2017 April Seminar and Luncheon
21 Mar 2017 2017 Continuing Education and Shrimp Boil
27 Feb 2017 February Seminar and Luncheon
23 Jan 2017 January Seminar and Luncheon
15 Dec 2016 2016 Holiday Party
24 Oct 2016 October Seminar and Luncheon
13 Sep 2016 2016 GSOC Annual Golf Tournament
12 Sep 2016 September Seminar and Luncheon
23 May 2016 Annual Spouse and Awards Night
09 May 2016 Continuing Education and Shrimp Boil
11 Apr 2016 SEG Distinguished Lecturer Joe Dellinger
28 Mar 2016 March Seminar and Luncheon
22 Feb 2016 February Seminar: PSDM Case Study, Dr. Morgan Brown
25 Jan 2016 GSOC Seminar and Lunch Featuring Bob Hardage
14 Dec 2015 Holiday Party
16 Nov 2015 GSOC November Luncheon. Clint Barefoot, Eagleford Case Study
26 Oct 2015 GSOC October Luncheon. Paul Constance, Multicomponent Surface Seismic and VSP for Reservoir Characterization of the Mississippian
15 Sep 2015 GSOC Annual Golf Tournament
14 Sep 2015 GSOC September Luncheon. SEG Honorary Lecturer, Dan Whitmore
19 May 2015 Spouse and Awards Night
28 Apr 2015 Continuing Education and Shrimp Boil
16 Apr 2015 SEG Distinguished Lecturer Dr. Jean Virieux
23 Mar 2015 March Technical Seminar and Luncheon
01 Jun 1990 1990 Annual Meeting

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