Core Analysis Freebies
Conventional (Routine) Core Analysis from full core or rotary sidewalls provide a platform for the calculation of many petrophysical parameters, for each plug, via inversion of the equation to solve for the equations least certain variable. This is an extremely fruitful approach to petrophysics and leads to hard answers wherever the reservoir rock type (RRT) and ideally the borehole type (BT) are similar. With this approach core data has far greater value than the conventional limited use of grain density, porosity and permeability. Moving to this approach in formation evaluation opens up countless fast solutions to problems which were previously seen as unsolvable or requiring the acquistion of more expensive log data. Problems which were put in the “too hard”, “too expensive” or “too slow” basket.
Some of the freebies on offer include:
rhoga, rhofa, npmxa, npfa, dtmxa, dtfa, Rwa, ma, BQva, na, T2cuta, BFVa, aa, porcut, swcut
The suffix “a” denotes the value is not a direct measurement but an apparent value from the equation from which it is derived. The equation is the equation the petrophysicist has decided to use for the petrophysical evaluation of the output in question, e.g. Sw, for the reservoir rock type (RRT) and the data available and must be used in the subsequent evaluation