Core sample resistivity, ip testing methods—zonge lab services
Contents
- Figuring out core sample IP response, resistivity and conductivity laboratory measurements
- Figuring out core sample IP response, resistivity and conductivity laboratory measurements
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Figuring out core sample IP response,
resistivity and conductivity laboratory measurements
Figuring out core sample IP response,
resistivity and conductivity laboratory measurements
Measurements for caused polarization response and resistivity come in time-domain mode utilizing a technique produced by Newmont Exploration, Limited.
Utilizing an 8. second period (2 seconds on positive, 2 seconds off, 2 seconds on negative, 2 seconds off), the IP fact is integrated more than a window from .45 to at least one.1 seconds throughout the off-time.
These procedures are carried out concurrently utilizing a Zonge GDP series geophysical data processor, along with a constant current transmitter (as little as 100 nanoamps). IP measurements come in time domain for an entire cycle of 8. seconds (two transmitter pulses) averaged over 16 cycles. The reported chargeability data might be transformed towards the normalized standard Newmont IP unit (M331 msec) by multiplying by 1.87. The resistivity values have been in ohm-meters.
Factors
The process requires specifically prepared cores, bicylindrical cores or cubed samples. Moisture saturation under vacuum is needed for reliable data. When the received samples are moderately dry, for example surface samples, vacuum impregnation with sterilized water is conducted before resolution of the electrical qualities. As a result, the reported resistivities of these samples might not be truly associated with the rock in situ but is determined by the quantity of water ingested in to the rock pores. When the samples are saturated with interstitial water upon receipt they might be run without impregnation with water.
Interpreting the measured results
IP values determined within the laboratory on small core samples are usually associated with macroscopic IP responses and really should agree well with surface measurements.
Rock resistivities measured within the laboratory are usually not suggestive of the macroscopic resistivities deduced from surface measurements. The are usually greater than observed field resistivities. It is because small core samples don’t adequately represent the big-volume average resistivities from the ground, which may be affected by fractures and problems that contains mineralized solutions.
Fresh drill-core samples, however, which haven’t been uncovered towards the air or elevated temperatures will sometimes yield representative rock resistivities within the laboratory.
Conductivity
Conductivity measurements are carried out on massive sulfide samples using lead-sulfide electrodes. The outcomes are reported in Siemens/meter.
The samples are ready by cutting parallel planar faces on every sample, maximizing the space between your faces. Saturation with water is generally not essential.
Resourse: http://zonge.com/rock-qualities-lab/lab-measurements/ip-and-resistivity/
