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    • 26 Feb 2018
    • 11:30 AM - 1:00 PM
    • Oklahoma History Center
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    DAS Microseismic and Strain Monitoring During Hydraulic Fracturing

    Speaker: Dan Kahn, Devon Energy

    Authors: Dan Kahn, Martin Karrenbach, Steve Cole, Kevin Boone, Andrew Ridge, Jamie Rich, Dave Langton and Ken Silver

     

     

     

    Abstract 

    Hydraulic fracturing operations in unconventional subsurface reservoirs are typically monitored using geophones located either at the surface or in adjacent wellbores. A novel approach to record hydraulic stimulations utilizes fiber-optic Distributed Acoustic Sensing (DAS). A fiber-optic cable was installed in a treatment well in a subsurface reservoir (Meramec formation). DAS data were recorded during fluid injection of same fibered well and also during injection into a nearby treatment well at a distance of 350m. For both scenarios the DAS sensing array consisted of approximately 1000 channels at a fine spatial and temporal sampling and with a large sensing aperture. Thus, the full strain wave field is measured along the borehole over its entire length. A variety of physical effects, such as temperature, low-frequency strain and microseismicity were measured and correlated with the treatment program during hydraulic fracturing of the wells. These physical effects occur at various frequency scales and produce complementary measurements. Microseismic events in the magnitude range of -0.5 and -2.0 at a maximum distance of 500m were observed and analyzed for recordings from the fiber-equipped treatment well and also neighboring treatment well. The analysis of this DAS data set demonstrates that current fiber-optic sensing technology can provide enough sensitivity to detect a significant number of microseismic events and that these events can be integrated with temperature and strain measurements for an improved subsurface reservoir description.

     

    Biography

    After graduating from Brown University (2001) with a B.S. in Geology/Physics/Mathematics, Dan Kahn received his M.S. in Geophysics from Georgia Institute of Technology (2004) with a thesis, Concentration of Methane Hydrate: A Study of the Blake Ridge. He then earned a Ph.D. from Duke University (2008), working at the Krafla, Iceland geothermal station and the Basel Hot Dry Rock Project with a dissertation, Crack Propagation in Hydro-Fractured Reservoirs: A Study Using Double-Difference Location Techniques. Dan worked at Exxon as a Senior Geophysicist (2008-2011), during which time he did structural and stratigraphic interpretation of the Austin Chalk Trend and was lead survey designer for the Ranridge and Papua New Guinea projects. He was an Exxon Gold Service Medallion recipient (2008). Dan joined ION Geophysical in 2011, where he specialized in the characterization of unconventional reservoirs through microseismic fracture imaging and analysis. He was co-developer ION’s Java-based microseismic tool kit, authoring 7 patents. Dan moved to Devon in 2015 where he is responsible for overseeing data acquisition and analysis for the description of the dynamics of unconventional reservoirs, including microseismic, magnetotelluric, time domain electromagnetics, and optical fiber techniques. Dan was also a USA Olympic Trials qualifier in the Marathon with the “A” standard.

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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
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