| Disertante | Presentación |
| MARK ZOBACK |  |
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RESUMEN DE LA CONFERENCIA:
“Geomechanical Processes Affecting Optimization of Multi-Stage Hydraulic Fracturing”
Abstract
Two topics will be addressed that are fundamental to improving production from unconventional oil and gas reservoirs. The first topic is related to the viscoplastic behavior of clay- and organic-rich rocks. Through field data, laboratory tests and theoretical modeling, we demonstrate that lithology-dependent, layer-to-layer variations of the least principal stress are commonplace where oil and gas are produced from unconventional reservoirs. These variations of the least principal stress occur because of viscoplastic stress relaxation – meaning that the two horizontal principal stresses become closer in magnitude to the vertical stress relatively more viscoplastic formations. It will be demonstrated that variations of stress magnitude with depth have a dramatic effect on hydraulic fracture propagation and strong influences optimal well spacing and lateral landing zone. The second topic is shear stimulation during multi-stage hydraulic fracturing. Several case studies will be presented in which slip on pre-existing fractures and fault (induced by pressure leakage out of the hydraulic fractures) significantly affect the drainage volume around a well and has a significant affect on production. Using machine learning/AI techniques leads to insights about completion parameters that optimize production in a given area.
Biography
Dr. Mark D. Zoback is the Benjamin M. Page Professor of Geophysics, Emeritus at Stanford University, where he was also the Director of the Stanford Natural Gas Initiative and Co-Director of the Stanford Center for Induced and Triggered Seismicity and the Stanford Center for Carbon Storage and a Senior Fellow in the Precourt Institute for Energy. Dr. Zoback conducts research on in situ stress, fault mechanics, and reservoir geomechanics with an emphasis on shale gas, tight gas and tight oil production as well as CO2 sequestration. Dr. Zoback served on the Secretary of Energy Subcommittee on shale gas development and the National Academy of Engineering Committee that investigated the Deepwater Horizon accident. He is the author of two textbooks and the author/co-author of approximately 400 technical papers. His most recent book, Unconventional Reservoir Geomechanics, was written with Arjun Kohli, and published in 2019 by Cambridge University Press. His online course, Reservoir Geomechanics, has been completed by over 12,000 people around the world. Dr. Zoback has received a number of awards and honors including election to the U.S. National Academy of Engineering in 2011, in 2013 he was awarded an Einstein Chair Professorship of the Chinese Academy of Sciences and received the Robert R. Berg Outstanding Research Award of the AAPG in 2015. He was the 2020 chair of the Society of Petroleum Engineers Technical Committee on Carbon Capture, Utilization and Storage and 2021 Honorary Lecturer for the Society of Exploration Geophysicists. https://earth.stanford.edu/people/mark-zoback
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