Dissertation/Thesis Abstract

Automatic simultaneous multiple-well ties
by Munoz, Andrew, M.S., Colorado School of Mines, 2014, 39; 1553902
Abstract (Summary)

Well logs, measured in depth, must be tied to seismograms, processed in time, using a time-depth function. Well ties are commonly computed using manual techniques, and are therefore prone to human error. I first introduce an automatic single-well tie method that uses smooth dynamic time warping to compute time shifts that align a synthetic seismogram with a seismic trace. These time shifts are constrained to be smoothly varying. I also show that these well ties, in my example, are insensitive to the complexity of my synthetic seismogram modeling. Tying multiple wells compounds errors in single well ties, and maintaining consistency among multiple single well ties is difficult. I introduce an automatic approach to tying multiple wells that improves consistency among well ties. I first model synthetic seismograms for each well. I then create a synthetic image by interpolating the synthetic seismograms between the wells and along seismic image structure. I use smooth dynamic image warping to align the synthetic image to the seismic image and compute updated time-depth functions for each well. I then interpolate the updated time-depth functions between the wells, and map the time-migrated seismic image to depth.

Indexing (document details)
Advisor: Hale, Dave
Commitee: Batzle, Mike, Young, Terry K.
School: Colorado School of Mines
Department: Geophysics
School Location: United States -- Colorado
Source: MAI 52/06M(E), Masters Abstracts International
Subjects: Geophysics
Keywords: Automatic, Dynamic warping, Well ties
Publication Number: 1553902
ISBN: 978-1-303-82349-7
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