[ghsc-seminars] GHSC Seminar, TOMORROW, Friday, 6/7 @ 10am - Bob Slocum, Slocum Geophysics, LLC

[Rigler, Erin (Josh)]

*Ultra-High Resolution Aeromagnetic (U-HRAM) Surveys for Drilling Hazard
Avoidance & Geophysical Applications *


*Robert E. Slocum **Slocum Geophysics, LLC and Polatomic, Inc.*

The advanced U-HRAM aeromagnetic survey system is derived from the US
Navy’s state-of-the-art airborne magnetic detection system developed by
Polatomic, Inc. for anti-submarine warfare. The Office of Naval Research
granted Polatomic a Dual-Use charter to exploit the Navy’s Compact Magnetic
Detection System technology for geophysical applications through Slocum
Geophysics. Part 1 of this presentation describes the U-HRAM system that
makes possible measurements of the magnetic field and the magnetic vertical
gradient with unprecedented resolution and accuracy while towed by a DC-3
aircraft. In Part 2, the benefits of the resulting U-HRAM data are
discussed for three different U-HRAM case studies in order to point out the
value-added for clients.

The first case study is a 400 mi2 survey in the NW STACK Play on the
Anadarko Shelf in northwestern Oklahoma. The U-HRAM data was used to map
basement and sedimentary faults for managing horizontal drilling hazard
avoidance and fracking control. The value-added for the client is high
resolution fault maps developed from U-HRAM data at a cost less than 5% of
that of 3D seismic maps for a typical county size survey area. The survey
did not require permitting and was completed in less than three months with
map delivery to the client. The measured magnetic vertical gradient data
are used to make high resolution basement surface profiles. The U-HRAM
fault maps have been validated with mud log cuttings analysis as ‘spot-on’
for 18 wells and provide a useful tool for managing horizontal drilling and
fracking when no seismic data is available. When combined with available
seismic data, U-HRAM enhances the ‘big picture’ view of the oil play. The
second case study reports on a smaller survey for prospecting in the Ft.
Worth basin in northern Hill County, TX.  The value-added for the
prospector in this southern Barnett shale play is an economical way to map
fault structures in order to greatly reduce the amount of 3D seismic data
required. The third case study reports on a demonstration survey that
highlights a fault structure in the Hainsville Salt Dome area in Wood
County, Texas. The U-HRAM measured magnetic vertical gradient data is used
to map a shallow fault structure with production where the basement is at a
depth of 28,000’.

In conclusion, the U-HRAM survey is a new tool in the geophysical tool box
that significantly enhances the effectiveness of aeromagnetic surveys and
offers value-added to clients for geophysical exploration, drilling hazard
avoidance and disposal well site selection at less than 1/20th the cost of
3D seismic.

*Friday, June 7th**, 2019*
*10-11am*
*  (Mountain Time)*
*USGS, 1711 Illinois Street, Golden, CO*
*Entry Level Seminar Room (204)*

*Note: Please arrive *~5 minutes early* and *bring photo ID* for
airport-style security measures now in place at the USGS building.

Thank you,
GHSC Seminar Committee

Ben
Mirus - bbmirus at usgs.gov
Josh Rigler - erigler at usgs.gov
Oliver Boyd - olboyd at usgs.gov <oboyd at usgs.gov>
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