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Velocity calibration for microseismic monitoring; a very fast simulated annealing (VFSA) approach for joint-objective optimization

Donghong Pei, John A. Quirein, Bruce E. Cornish, Dan Quinn and Norman R. Warpinski
Velocity calibration for microseismic monitoring; a very fast simulated annealing (VFSA) approach for joint-objective optimization (in Advances in seismic imaging and inversion, Stefan Buske (editor), Isabelle Lecomte (editor), Tamas Nemeth (editor), Stephane Operto (editor) and Valenti Sallares (editor))
Geophysics (November 2009) 74 (6, Suppl.): WCB47-WCB55

Abstract

To accurately locate microearthquakes that are genetically related to hydraulic fracture stimulation, a thorough knowledge of the velocity structure between monitoring and fracturing treatment wells is essential. Very fast simulated annealing (VFSA) is implemented to invert for a flat-layered velocity model between wells using perforation or string-shot data. A two-point ray-tracing method is used to find the ray parameter p for a ray traveling from a source to a receiver. The original traveltime-calculation formula is modified to account for the borehole source-receiver geometry. VFSA is used as a tool to optimize P- and S-wave velocities simultaneously. Unlike previous applications of VFSA, two improvements result from a new study: (1) both P- and S-wave arrival-time misfits are considered in a joint-objective function, and (2) P- and S-wave velocities are perturbed simultaneously during annealing. The inverted velocities follow the true values closely with a very small root-mean-square error, indicating the inverted model is close to the global minimum solution whose rms error should be zero for synthetic examples. Data noise contaminates inverted models, but not substantially in synthetic test results. A comparison of models inverted using VFSA and Occam's inversion technique indicates that inverted models using VFSA are superior to those using Occam's method in terms of velocity accuracy.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 74
Serial Issue: 6, Suppl.
Title: Velocity calibration for microseismic monitoring; a very fast simulated annealing (VFSA) approach for joint-objective optimization
Title: Advances in seismic imaging and inversion
Author(s): Pei, DonghongQuirein, John A.Cornish, Bruce E.Quinn, DanWarpinski, Norman R.
Author(s): Buske, Stefaneditor
Author(s): Lecomte, Isabelleeditor
Author(s): Nemeth, Tamaseditor
Author(s): Operto, Stephaneeditor
Author(s): Sallares, Valentieditor
Affiliation: Halliburton, Houston, TX, United States
Affiliation: Freie Universitaet Berlin, Berlin, Federal Republic of Germany
Pages: WCB47-WCB55
Published: 200911
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 27
Accession Number: 2010-047915
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: NORSAR, NOR, NorwayChevron, USA, United StatesUniversite Nice-Sophia Antipolis, FRA, FranceCSIC, Centre Mediterrani d'Investigacions Marines i Ambientals, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201026
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