I am making a best effort to utilize the IP extension...but having some difficulties.

JoeInman

Admittedly I am dealing with time-domain IP data which I normally avoid. What I don't understand is what precisely is in the array channel? I am importing gdd data with 20 gates on the decay. The channels are noted to be IP and IP_average. So what is this IP? I want chargeability which is an integral or for digital data is M=((V(t0)x(^t0)+V(t1)x(^t1)+V(t19)x(^t19))/Vp; with Vp in volts, V(t) in mvolts and ^tn is the nth window with in seconds. So what is in the array channel listed as 'IP'? The help menu says it is V(t)/Vp and that the IPaverage is (V(t0)+V(t1)+...V(t19))/nVp where n would be 20 in this case. What I want is chargeability and I would like to use something close to the 'Newmont standard', which is from 450ms to 1100 ms or thereabouts. What gives?

TaronishPithawala

@JoeInman, at the moment the Induced Polarization extension for Oasis montaj does not have an automatic calculation for apparent chargeability. In order to calculate the various choices, e.g. Newmont standard, you'll have to use channel math and the equation for M in your original post over the specific time window of interest.

JoeInman

Thanks, Taronish.....I understand and that is easy to do. One additional question for now....so the IPaverage and/or M....is that a simple average of the values for all the windows....which would be Sum of Vi/nVp. Is there any normalization of the window width in calculating the average, or is it just a simple average?

TaronishPithawala

Hi @JoeInman, the IP_avg channel that is populated by the IP extension when you setup your database is a simple average - no normalization over the time window is done automatically.