GEOG 4891 Lecture Notes - Lecture 10: Quick Look, Gypsum, Feldspar
Document Summary
Neutron log is scaled in terms of limestone porosity units at 3 p. u. per track. Density log is scaled in gm/cm3 at 0. 05 gr/cm3 per track. 2. 70 gm/cc point positioned to coincide with the zero of the neutron scaling. Curves are almost coincident clean water bearing limestone. D n seperation of about 2 divisions (+6, +7) positive seperation clean water bearing sandstone. D n seperation of about 5 divisions (-12, -16) negative seperation clean water bearing dolomite. D n seperation of about 7 divisions (-18, -21) negative seperation average shale. Care must be taken to recognize hydrocarbon bearing intervals, since the responce of light hydrocarbons will also produce a positive seperation. That means density readings a little bit at the left of the neutron readings. Of course,gr curve response is the main part of any lithology interpretation method. Clean, non-gas bearing zone of any common lithology or lithology mix, mid point between.
