Apparatus for producing a porosity log of a subsurface formation

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

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250256, 250262, 250268, 250270, 364422, 395 11, 395 22, 395928, 395929, G01V 510, G01N 23204

Patent

active

053007700

ABSTRACT:
A borehole logging tool is lowered into a borehole traversing a subsurface formation and a neutron detector measures the die-away of nuclear radiation in the formation. Intensity signals are produced representing the die-away of nuclear radiation as the logging tool traverses the borehole A signal processor, employing at least one neural network, processes the intensity signals and produces a standoff-corrected epithermal neutron lifetime signal to correct for standoff from the borehole wall encountered by the detector as the logging tool traverses the borehole. The signal processor further generates a porosity signal from the standoff-corrected epithermal neutron lifetime signal derived from measurements in borehole models at known porosities and conditions of detector standoff. A log is generated of such porosity signal versus depth as the logging tool traverses the borehole.

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