Analysis of simultaneous velocity and source parameter updates in microseismic FWI
- Nadine Igonin (Department of Geoscience, CREWES Project, University of Calgary, Calgary AB) | Kristopher A. Innanen (Department of Geoscience, CREWES Project, University of Calgary, Calgary AB)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- Time-domain, Finite difference, Microseismic, Multiparameter, Full-waveform inversion
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- 18 since 2007
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In the microseismic field, a complete characterization of events involves determining the positioning and focal mechanism properties, which requires an accurate seismic velocity model. Conversely, the construction of a velocity model with surface seismic data suffers from a lack of full illumination, a deficit which could in principle be mitigated by microseismic event ray paths. The velocity model and event characterization problems are in this sense strongly interconnected, each, if it were solved, supporting the other. Assuming an imperfect velocity model derived from surface seismic data as a starting point, and microseismic events as data, a full waveform inversion (FWI) methodology involving simultaneous updates in both source property model parameters and velocity model parameters can be formulated. The resulting gradient and Hessian quantities can be used to solve the inverse problem for all unknowns, or, equally importantly, to help quantify the cross-talk between velocity and source models, optimize acquisition, and act as a tool for appraisal. In this paper we formulate a basic scalar acoustic version of microseismic full waveform inversion (MFWI), set out the forms for the gradients, present an early-stage numerical analysis of MFWI updates, and comment on some important aspects of cross-talk between velocity model and source properties.
Presentation Date: Monday, October 15, 2018
Start Time: 1:50:00 PM
Location: 207C (Anaheim Convention Center)
Presentation Type: Oral
|File Size||915 KB||Number of Pages||5|
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