PGS and UMD host Heloise Lynn

There are two upcoming opportunities to hear the 2019 SEG Honorary Lecturer, Heloise Lynn, speaking on “Azimuthal P-P seismic measurements: Past, present, and future” at the November 14, 2019 meeting of the Potomac Geophysical Society at 7:00 p.m. at the DoubleTree by Hilton McLean Tysons, 1960 Chain Bridge Road, 22102. And she will speak again the next day, Friday, November 15, at the UMD Geology Department Colloquium, at 3 pm in PLS 1130 (  The flyer in the PGS email has both the PGS and UMD info on it (

As always, guests are welcomed and we encourage you to spread the word about our meetings to your colleagues and students (a flyer is attached).  If you plan on attending, please RSVP to by noon Monday, November 11.  We thank Royal Dutch Shell for their support of the Society of Exploration Geophysicists’ Honorary Lecture Program and hope you’ll be able to join us for this great talk!

Azimuthal seismic analyses give rise to better imaged data and insights into the in-situ stress field and the aligned porosity (fractures) that flow fluids. Ignoring azimuthal seismic information, which in the past was quite easy to do, is now inexcusable because of vast improvements in:  (a) platforms to view, map, and analyze az’l prestack or partial stack data; (b) acquisition (more data); and (c)  processing algorithms (e.g., orthorhombic prestack depth migration [PSDM]).
Heloise Bloxsom Lynn is a geophysical consultant and instructor with Petroskills and Nautilus World. She started working in seismic reflection data in 1975, processing U.S. onshore data for Texaco in Houston. Lynn worked for Texaco, Amoco, BP, and then in 1984, she and her husband, Walt, formed Lynn Incorporated. Her consulting experience includes working in North America, Hungary, Qatar, Kuwait, Saudi Arabia, Pakistan, Australia, Thailand, China, and Japan. She specializes in the use of 3D multiazimuth and/or multicomponent data to obtain structure, lithology, porosity, pore fluids, in-situ stress, and aligned porosity (aka natural fractures). She also includes conventional VSP data processed for split-shear waves in these projects because there is nearly always a source-generated S-wave or a near-source mode-converted S-wave, and/or mode-conversions at impedance boundaries. In the fall of 2004, she was the SEG/AAPG Distinguished Lecturer, speaking on “The Winds of Change – anisotropic rocks, their preferred direction of fluid flow, and their associated seismic signatures.” 2014 brought an Honorable Mention, Best Paper, SEG Annual Meeting to H. Lynn, W. Lynn, J. Obilo, V. Agarwall, “Azimuthal prestack depth migration for in-situ stress evaluation, in a fractured carbonate oil reservoir: predrill prediction of instantaneous shut-in pressure gradients.” A 2015 SEG award citation: “Heloise Lynn was presented the Reginald Fessenden Award for her 35-year career of translating the anisotropic behavior of seismic waves into practical applications that allow stress fields, fracture systems, and geomechanical properties to be characterized in targeted rock systems. She has described her research findings in many oral presentations and in 47 published papers that collectively create an invaluable knowledge base for scientists, researchers, students, teachers, and exploration geophysicists.” In 2016, she presented the Geophysical Society of Houston webinar, “Applied Azimuthal Anisotropy – Azimuthal 3D P-P Seismic: Why Bother?” In 2017, she was invited back to present “Basics and Updates on Anisotropy: Azimuthal P-P for Better Imaging, Fractures & Stress Analysis — Acquisition, Processing & Interpretation.” Both webinars are available through SEG. She earned a BA in geology-math from Bowdoin College, Maine; an MSc in exploration geophysics from Stanford University; and a PhD in geophysics from Stanford University. She is a member of SEG, EAGE, the Geophysical Society of Houston (GSH), AAPG, and SPE.
The PGS meeting location is within one-half mile of the Tysons Corner Metro station, near I-495, and has free parking available.  Our private meeting room is located on the second floor of the hotel.  The optional dinner cost will be discounted to $35 for members in good standing (have paid dues), and $45 for non-members, and is inclusive of coffee, tax and gratuity.  Drinks may also be purchased in the private meeting room on a cash basis.  Members and guests may attend the presentation after dinner for no charge; we estimate that the presentation will begin at 8:15 p.m.  For attendees who arrive early, social time will be held at the Tysons Social Pub on the first floor of the DoubleTree by Hilton hotel.

In summary:
Social Time: 6:00-7:00 p.m., Tysons Social Pub, first floor DoubleTree by Hilton
Dinner: 7:00-8:15 p.m., Overlook Room, Social Cafe, second floor DoubleTree by Hilton

Meeting & Presentation: 8:15-9:30 p.m., Overlook Room, Social Cafe, second floor DoubleTree by Hilton

Future meeting dates: Dec. 5, Jan. 9, Feb. 13, Mar. 12, Apr. 9, May 21

e-mail distribution address of the Potomac Geophysical Society


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