Vibroseis sourcing methodology: A comparison of long, short, and slip-sweep 3D data image volumes acquired and constrained by equivalent source time (KWP Phase I)
- J.W. (Tom) Thomas (Dawson Geophysical) | Tom Phillips (Dawson Geophysical) | Kevin Werth (Dawson Geophysical) | Chris Lindsey (Dawson Geophysical)
- Document ID
- Society of Exploration Geophysicists
- SEG International Exposition and Annual Meeting, 15-20 September, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Exploration Geophysicists
- Vibroseis, Case history, Acquisition, 3D, Simultaneous source
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The goal of every geoscientist acquiring a seismic survey is to optimize the recording and sourcing parameters to get the best possible image while staying within the allotted budget. The allotted budget will address permit and survey fees plus recording crew costs that are metered in time. The geoscientist will determine the location of the receivers based on certain geological objectives plus the operational concerns of crew deployment and handling within the metered time constraint. Once the receiver configuration is decided, full attention is given to the determination of the source parameters.
The geoscientist has latitude in specifying Vibroseis source parameters in regards to "pad time" plus travel time and the density of source points in the survey, provided the product stays within the budget. Pad time is defined as the product of the sweep length (plus the listen time) with the number of repetitions for each source point (SP). Travel time is the overhead of the Vibroseis sets moving from one SP to another. Because of the numerous sourcing options, there seems to be as many, and often conflicting, opinions on the selection of the critical parameters of pad time and source density plus sourcing methodology as there are seismic acquisitionists. However, most of these contrasting sentiments seem to be divided into two book-end camps. One camp believes in maximizing the pad time per SP along with lower SP survey density, while the other camp desires minimal pad time per SP with a high SP density. These source parameter choices have a significant influence on the image quality of the seismic data volume.
The purpose of this experiment is to empirically evaluate the image quality of five 3D seismic volumes collected within the boundaries of the book-end acquisition philosophies. Each data volume was collected with the mandate that the source parameters and sourcing methodology would result in equivalent metered time for each test. All volumes are processed for data image quality comparison through partial pre-stack time migration, DMO.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 3:55 PM
Presentation Type: Oral
|File Size||1 MB||Number of Pages||5|