SURVEY DESIGN

RECORDING EQUIPMENT

Basin uses Seistronix’s advanced, 24-bit EX-6 high resolution exploration seismographs, matched with six element SM24 geophones. The system is flexible, and expandable, allowing for complex survey geometries. Built in diagnostic tools continuously scan the active spread, providing alerts whenever data quality may be compromised.
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ENERGY SOURCES

XLR8
In 2006 Basin purchased United Service Alliance’s “XLR8” (accelerate) energy source. Conceptually it works the same as the EWG, stacking multiple hits into one seismic record, with one main exception, SIZE. The hammer, groundplate, and acceleration are all much larger, resulting in better imaging to greater depths. The unit is mounted on a 23,000 lb International 4800 4WD truck. The 1,450 lb hammer is accelerated by compressed nitrogen and generates over 500,000 ft/lbs of energy per shot. The XLR8 has amazed geophysicists with its data quality. It has collected high resolution reflections to over 12,000'. Despite its large size, it is ruggedly simplistic, and like the EWG more economical than other larger sources, allowing Basin to maintain its “more shots and fewer receivers” strategy.
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Bison EWG
The Elastic Wave Generator “EWG” was created to provide a repeatable, economical, and landowner friendly alternative to dynamite and vibroseis. Mechanically it works by hydraulically lifting a 700 lb steel hammer, then accelerating it downward using large elastic bands. The hammer cycle terminates on a steel groundplate imparting energy into the formations below.
For over 10 years Basin repeatedly proved that this smaller energy source applied at a level up to 10 times as much as alternate sources would consistently image targets at 6,000’ to 7,000’ and up to 10,000’ in good data areas.
Instead of utilizing a single high-energy explosion or sweep (dynamite or vibroseis), the EWG works by combining (or “stacking”) 4-12 lower energy accelerated impacts into a single record. The record is “built” one stack at a time. The biggest advantage over the mentioned sources is cost. The much cheaper EWG allows for substantially more shot points over the entire survey, greatly increasing fold, resolution, and azimuth balance. A typical 3D dynamite survey might have 100 shots per square mile where a similar EWG survey would have 300+ shots per square mile. The EWG is the clear choice for detailing shallow, subtle, channel sands, or small splinter faults.
Because of the relative cheap cost of EWG shot points and expensive cables/phones, Basin adopted the strategy of “more shots and fewer receivers”. Conversely since dynamite and vibe trucks are very expensive, larger seismic crews tend to promote their total channel counts.
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DISCLAIMER
The information on this website is presented solely for the purpose of providing general information and should not be used as a source of specific instructions on service/product use and claims.