Jeremey,
Difficult to figure this stuff out as there are so many log accronyms out there.
ISF might be: Instantaneous Frequency (could be from some sonic tool); BHC may stand for Borehole Compensated (or Caliper) and could be compensating other logs. Alternatively it could be the Standard Deviation on Sonic Transit Time (actually QBHC)
CNL could stand for a count rate and may be related to neutron or gamma measurements. More likely is thats it's the abbreviation for Compensated Neutron Log.
LDT could be a (This website has a long list of accronyms for the most used well logs; albeit not searchable yet).
NGT might be from the Natural Gamma Ray Tool. HDT could be the Hole Depth or the High Resolution Dipmeter. WST is most likely the Well Seismic Too and is thus a measure of accoustic slowness (might match with your LDT).
LDL: no idea... With these pointer you may be able to figure some out based on value ranges and lithology matches. I think this wells has been logged with a sonic tool though...
hope that helped