305: Building Trust in Elastic FWI

“We always aim for 60 percent. The other 40 percent, we are ready to make mistakes, learn from those mistakes, and then move forward.” A 600-meter carbonate platform forced Dr. Ahmad Riza Ghazali and his PETRONAS team to reconsider a basic assumption in their seismic workflow. Acoustic FWI and reverse time migration could not adequately image the layers beneath it, while 3D distributed acoustic sensing revealed extensive P-to-S mode conversion at the carbonate boundary. That evidence led the team toward multiparameter elastic FWI. And images that Ahmad says helped support successful drilling. His SEG Pacific South Honorary Lecture, Next Generation Seismic Imaging Elastic FWI and Wavefield Solutions for Seeing Through Complex Carbonates, turns that experience into a regional argument. As exploration moves toward deeper Miocene carbonates, better physics may expose plays conventional imaging misses. The remaining challenge is economic and organizational because elastic FWI costs substantially more, requires teams to learn together, and asks decision-makers to invest before the outcome is certain. See Ahmad's upcoming schedule and register at https://seg.org/education/lectures/seg-honorary-lecture-ahmad-ghazali/. QUESTIONS THIS CONVERSATION ANSWERS * What does mode conversion reveal that acoustic FWI misses beneath thick carbonates? * How did 3D DAS change the team’s understanding of a failed imaging result? * What gives decision-makers enough confidence to drill from an emerging workflow? THIS EPISODE PROUDLY SPONSORED BY HART ENERGY SUPER DUG Conference & Expo is Hart Energy's premier shale event and the largest event of its kind. If you're looking to stay ahead of what's next in U.S. shale, don't miss the 2026 SUPER DUG, happening September 15-17 in Houston. Join the industry's top operators, executives and investors for three days of market outlooks, strategic discussions and unmatched networking focused on the trends shaping the future of oil and gas. Register today at https://hartenergy.com/SUPERDUG26. Be sure to use promo code SD26-SEG at checkout to save on your registration. Be part of the conversations shaping the future of U.S. shale. ABOUT SEISMIC SOUNDOFF Seismic Soundoff showcases conversations addressing the challenges of energy, water, and climate. Produced by the Society of Exploration Geophysicists (SEG) and hosted by Andrew Geary of 51 features, these episodes celebrate and inspire the geophysicists of today and tomorrow. Three new episodes monthly. See the full archive at https://seg.org/resources/podcast/.