services
Electronic Multishot - Component Downhole
Magnetic Surveying
Mining exploration,
feasibility and development projects are
increasingly utilizing borehole geophysical
data to maximize information from the borehole
for cost effective and predictive exploitation
of their resources. A common method of surface
exploration used is Electro Magnetic
or EM which if successful, is followed
up with drilling but… what if the drilling
misses the target??
Downhole Surveys offers a new service
utilizing 3 component magnetic data recorded
by the Electronic Multishot producing
off hole 3 dimensional magnetic modeling.
The model generates "near miss" scenarios,
during a drilling program, immediately after
a drilling program or within old boreholes
on a newly acquired exploration prospect.
Conventional aeromagnetic surveys provide
a 2 dimensional image of the total magnetic
intensity of the acquisition level. Magnetic
vector data collected within boreholes aims
to provide a reliable third dimension to
current aeromagnetic surveys and answer
the questions posed by the surface magnetic
anomaly maps.
Magnetic Data Acquisition:
Downhole Surveys utilizes the Electronic Multishot Triaxial Borehole Magnetometer
to provide highly accurate surveying of
borehole trajectories. Each borehole is
accurately surveyed at an interval of 2m
from top to bottom. The MeasureIT
software is used
to flag the magnetic readings. These are
readings greater than a pre determined magnetic
threshold. This is important to determine
the actual borehole path. In some instances
the magnetic data may not be useable in
defining the borehole path, in these cases
a Gyro should be used to.
Once the actual bore hole path is determined
the 3 component magnetic data is used to
generate calculated magnetic curves based
on a range of magnetic body shapes, locations
and distance around and away from the borehole.
The calculated curves are compared to the
observed curves and a best fit made. The
modelling of the magnetic data enables the
identification of magnetic targets away
from the borehole and allows adjustments
in ongoing or planned drilling projects.
|
 |
WHAT'S
BENEATH THE SURFACE? |
 |
| |
 |
|
 |
|
 |
|
