Page 168 - The Geological Interpretation of Well Logs
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- THE GEOLOGICAL INTERPRETATION OF WELL LOGS -
Table 11.1 Logging-too] response values. All vatues are shown so that they cover the ranges found in the various sources, i.e.
none of the sources has values outside those listed. Prom Serra (1972, 1979), Dresser Atlas (1983), Gearhart (1983),
Schlumberger (1985, 1989a).
Material Resistivity Gamma ray Auna Density log Neutron porosity
(ohm m?/m) API (usif) (g/cm?) (ma) units
c % Sandstones up to 1000 18-160 53-100 2.59-2.84 0-45
E ‘a Limestones 80-6 X 107 18-100 47.6-53 2.66-2.74 0-30
53 °0 Dolomites 1-7 X 106 12-100 38.545 2.8-2.99 0-30
Y= Shales 0.5-1000 24-1000 60-170 2.65-2.7 25-75
* 2 Quartz }o-10 > $1.2-56 2.64-2.66 -2
Ee & Calcite 107-39? 0 45.5-49 2.71 -)
= 2 Dolomite 1-7 X 103 0 38.5-45 2.85-2.88 1
4 Illite 250-300 2.52-3.0 30
z & Chlorite 180-250 2.6—3.22 §2
uO < Kaolinite 80-130 2.4-2.69 37
Smectite 150-200 2.0-3.0 44
g Glauconite 75-90 2.2-2.8 38
3 Muscovite 10"'-16" 140-270 49 2.76-3.1 20
Biotite 10'-10'5 90-275 50.8-5 1 2.65-3,1 21
2. Microline 220-280 45 2.53-2.57 3
a Omnhoclase 220-280 69 2.52-2.63 —3
” Anthracite 103-5 0 90-120 1.32-180 38
s Bituminous coal 10-10° 0-18 100-140 1.15-1.7 60
e Lignite 4X lo? 6-24 140-180 05-15 52
Gas (av.) a 0 000886
a Methane ct 0 626 00076
S Oil (40° API) 10-10" 0.12-0.40 238 85-97 60
4 Water (80°F)
2 pure a 0 189-207 1.00 100
salt
(33,000 ppm) 0.035 (var) 0 180 L.19 60
2s
3 g Pyrite j0-'-10~% 39.2-39 4.8~-5.17 -3
= 3 Siderite 10*-1000 0 47 3.0-3.89 12
a Halite <10"-10" 0 66.7-67 2.03-2.08 3
2 Anhydrite 10-10" 0-12 50 2.89-3.05 -2
a Gypsum 1000 0 52-53 2.33-2.4 60
a Syivite 10-10" 500 74 1.86-1.99 -3
Polyhalite 200 57.5-58 2.79 25
= Basalt 8 X 102105 12-24 45-57.5° 2.7-3.2
3 Granite 108 24-96 46.8-53.5 2.52-2.8
5 Gneiss 10-10! 24-48 48.8-51.6 2.6-3.04
(1} No hole conditions specified: wil! therefore vary, (4) Calibrated
(2) Values for the matrix material, compressional wave. (5) Pressure 1 kbar.
(3) For the CNL tool of Schlumberger (6) All values variable.
Fsp = Feldspars ma = matrix
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