PS-wave Seismic Data: A Game Changer in Exploration & Monitoring
Dr. Ali Tura
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Ali Tura BIO
Ali Tura is Professor of Geophysics at the Colorado School of Mines with over 30 years of industry experience prior to academia and well recognized in the geophysical industry. After obtaining his Ph.D. degree from the University of California, Berkeley in Engineering, Dr. Tura worked for multiple oil and gas operators as well as running his own seismic processing company (4th Wave Imaging). During his industry career, Dr. Tura was Geophysical Senior Fellow at ConocoPhillips, Geophysical Advisor at Chevron and 4D subject matter expert at Shell. As such, Dr. Tura has broad O&G industry background in geosciences technologies (exploration, appraisal, development, production) with expert knowledge in seismic data processing, reservoir characterization and monitoring, multi-component seismic, integrated subsurface projects, rock physics and fiber optics technologies. He has worked on global subsurface offshore projects in Senegal: appraisal, Chile: exploration, Gulf of Mexico: exploration, Ursa/Princess, Holstein, Mars, Greatwhite, North Sea: Ekofisk, Eldfisk, Schiehallion, Alba, Gullfaks, Australia: Gorgon, Wheatstone, and Africa: Nembe Creek, Bonga, Angola Block 0 & 14. He has also worked on multiple onshore land projects in Ghawar, Tengiz, Kuparuk, Prudhoe Bay, Alpine, WestSac, Surmont, Weyburn, Hamaca. Dr. Tura also evaluated world-wide projects as part of the ‘Exploration Review Team’ (ConocoPhillips) and ‘Producing Assets Review Team’ (Chevron).
Dr. Tura is well recognized in the industry with over 100 publications as journal papers, expanded abstracts, and book chapters, and has organized and chaired over 27 SEG post-convention and summer research workshops on a large variety of topics. He holds 6 industry patents. He has served as Vice-president of the SEG, and Chairman of: SEG Research Committee, Global Affairs Committee, The Leading Edge, SEG-SEAM Inc. He was SEG Distinguished Lecturer in 2021 and received the Best Paper Award at SEG-IMAGE in 2021.
Dr. Tura is currently Chief Scientist at Tulip Geosciences, a geoscience consulting and training company, and co-director of Reservoir Characterization Project (RCP) at Colorado School of Mines (CSM). RCP is a well-established industry geophysical consortium with over 30 years history and about 20 energy industry sponsors. The diverse projects have 16 graduate students working on a range of topics: time-lapse multi-component seismic data, reservoir characterization, EOR in unconventional reservoirs, fiber optics, machine learning, compressive sensing, and carbon capture and sequestration.
ABSTRACT
We show on synthetic and field data examples that joint pre-stack AVA inversion of PP- and PS-wave data can significantly improve estimation of P-impedance, and S-impedance in particular. For reservoir characterization, improvements in these parameters can better identify reservoir rock and fluid properties. For reservoir monitoring time-lapse (4D) changes in P-impedance and S-impedance lead to inversion of saturation and pressure changes. We see that, in the joint inversion, 4D S-impedance is better estimated and not coupled to 4D P-impedance. These claims are first demonstrated on synthetic data and then on one onshore and two offshore field data.
