May 9th DGS Luncheon! Sissy Theisen and Corey Morgan

05/09/2024 @ 11:30 am – 1:15 pm


Date(s) - 05/09/2024
11:30 am - 1:15 pm

Wynkoop Brewing Company


If the PayPal option does not allow you to pay with credit card, you can pay with a card in person at the luncheon. Just use the Pay by Check option at checkout so we can get a good headcount.

Advanced Imaging – Is It The Whole Solution?

The last two decades have seen monumental advances in seismic imaging.  In a short amount of time, the industry has gone from pre stack depth imaging being reserved for only the most difficult geological situations to being a standard product for many operators.  Recent years have seen technologies like reverse time migration (RTM) and full waveform inversion (FWI) mature and with that maturity, a rising number of voices are saying that imaging technologies will eventually make a lot of data processing steps obsolete.  Is this accurate though?

We argue that for onshore processing, the assumption that the unconsolidated near surface variations can be primarily accounted for by velocity and statics corrections is false. The near surface in onshore seismic data creates a myriad of problems that data processing mostly addresses in a traditional processing flow in the form of refraction and residual statics along with noise attenuation that seeks to attenuate extraneous amplitudes rather than enhance signal.  The assumption being that issues with the unconsolidated near surface are mostly a result of velocity instability, and hence a timing correction. The reality is that the problem is far more complex than mere timing differences.  In fact, near surface microscattering drives many noise and amplitude issues in onshore seismic data that are often not well addressed.  This phenomenon has far reaching effects on the final interpretation of the data, particularly in AVO or seismic inversion work that is often critical to reducing drilling risk. To this end, we have developed a number of techniques to address not only problems with timing (statics), but also phase variations and amplitudes.  While certainly not a ‘holy grail’ of near surface corrections, these techniques offer substantial improvement in imaging which advanced imaging techniques alone cannot solve.

In this work, we compare the results of well imaged PSDM with a “conventional” preprocessing flow to a PSTM that has had our proprietary denoise and statics techniques applied over a well-known public domain dataset.  We can demonstrate that the PSTM, with more attention devoted to solving the near surface problem, produces more accurate QI products and better reduces predrill risk than a conventionally processed PSDM.

Sissy Theisen, President LSNS – Sissy has over 25 years of industry experience. She began her career at Western Geophysical in 1996 as a processing geophysicist after graduating with a bachelor’s degree in Geology and Geophysics from Missouri University of Science and Technology. Throughout her career she has been employed in a variety seismic imaging and management roles – from working as a processor onboard offshore seismic acquisition vessels for PGS in Brazil, Nigeria, and Canada; to managing customer support for Paradigm’s time and depth imaging software; and more recently, working in management roles at ION and NEOS as director of onshore processing and seismic imaging. In 2017 Sissy became business partners with Christof Stork and they began building Land Seismic Noise Specialists into the technology leaders they are today.

Corey Morgan – Director of Reservoir Services: Corey joins LSNS with almost 25 years in the oil and gas industry, starting as a field geophysicist with PGS working as a QC processor on both marine and onshore seismic crews around the world. His early career evolved through a variety of roles at PGS, Core Labs, GDC, and Fugro Jason.  The last fifteen of those years have been spent working in exploration and production companies, including Noble Energy (where he had a key role in the eastern Mediterranean discoveries), BHP Billiton, Lukoil, and Anglo-Dutch Energy.  His work has included management and technical roles in seismic acquisition and processing, quantitative interpretation and rock physics, prospect generation, geoscience support for M&A activities, and software development.  Mr. Morgan holds a BS and MS in physics from Texas A&M at Commerce and additional graduate level work in geophysics and petrophysics from the University of Houston and Texas A&M at Kingsville.  He also holds an FAA UAS professional pilot certificate.

Doors open at 11:30 am.  Meeting and presentation starts at 12 pm.





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