High-resolution multicomponent seismic studies in central Saskatchewan

Bradley J. Carr, Z. Hajnal, Arnfinn Prugger

Research output: Contribution to conferencePaper

Abstract

High resolution multicomponent seismic data were collected to investigate the seismological effects of fluids, fracturing, and fine structures in Phanerozoic strata of a potash mining region in central Saskatchewan, Canada. The mining horizon is near the top of salts in the Prairie Evaporite Formation, at about 1 km depth. Field acquisition parameters were adjusted to record high, frequency data with as much offset as possible. This involved: 1. the use of 1/8 kg and 2 kg charge sizes, 2. single 3-component geophones buried every 4 m, 3. shot points every 16 m, and 4. spread lengths of 480-960 m. A total of 4.8 km of multicomponent surface seismic data were acquired. The smaller charge size proved satisfactory for producing frequencies up to 200 Hz without saturating the recording with ground roll generated in the 100 m of glacial till in this area. The increased vertical resolution in the P-wave seismic data sharpens previously mapped lithologic boundaries, and edges to mound structures below the Prairie Evaporite. Shear wave surface seismic data is unknown from this area until now. Despite roughly 100 m of glacial till, shear wave and PS reflections are visible on the raw field records for both charge sizes. Ray tracing and 2D elastic finite difference modeling confirm the field observation of very slow shear wave speeds in the till. The Vp/vs ratio in this near-surface deposit is 5.5.

Original languageEnglish
Pages616-619
Number of pages4
Publication statusPublished - Jan 1 2018
Event1994 Society of Exploration Geophysicists Annual Meeting, SEG 1994 - Los Angeles, United States
Duration: Oct 23 1994Oct 28 1994

Other

Other1994 Society of Exploration Geophysicists Annual Meeting, SEG 1994
CountryUnited States
CityLos Angeles
Period10/23/9410/28/94

ASJC Scopus subject areas

  • Geophysics

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    Carr, B. J., Hajnal, Z., & Prugger, A. (2018). High-resolution multicomponent seismic studies in central Saskatchewan. 616-619. Paper presented at 1994 Society of Exploration Geophysicists Annual Meeting, SEG 1994, Los Angeles, United States.