Pulsed neutron tool for downhole oil typing

A system comprising:

• a tool comprising a source of pulsed neutrons and a gamma detector, where the gamma detector counts gamma arrivals;
• and
• a processor coupled to a memory, and the processor coupled to the gamma detector;
• wherein the memory stores a program that, when executed by the processor, causes the processor to:
• calculate a ratio of inelastic count rate to a capture count rate of the gamma detector for a particular depth within a borehole;
• and
• determine a value indicative of liquid density for the particular depth based on the ratio.

A computer-readable storage media storing a program that, when executed by a processor, causes the processor to:

• obtain an inelastic count rate and a capture count rate of a gamma detector for a particular borehole depth associated with a formation;
• calculate a ratio of the inelastic count rate to the capture count rate of the gamma detector for the particular borehole depth;
• determine a value indicative of liquid density based on the ratio of the inelastic count rate to the capture count rate of the gamma detector for the particular borehole depth;
• and
• determine information concerning the value indicative of liquid density of the formation as a function of borehole depth.