Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 CORRELATION OF ISOGEOTHERMAL SURFACES 39 the fact that the crystalline rocks are found at a depth of about 2,500 feet at Okemah and at about 10,000 feet at Oklahoma City. The observations show that the isogeothermal surfaces tend to parallel the granitic bed at the base of the sedimentary strata. The irregularities which appear at several points along the general trend are apparently due to local uplifts on some of which oil fields are located. Local Variati
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 CORRELATION OF ISOGEOTHERMAL SURFACES 39 the fact that the crystalline rocks are found at a depth of about 2,500 feet at Okemah and at about 10,000 feet at Oklahoma City. The observations show that the isogeothermal surfaces tend to parallel the granitic bed at the base of the sedimentary strata. The irregularities which appear at several points along the general trend are apparently due to local uplifts on some of which oil fields are located. Local Variations of Isogeothermal. Surfaces The Salt Creek and Long Beach oil domes, Figs. 3 and 4, are excellent ex- amples of local uplift in which the isogeothermal surfaces stand in a definite iA/266 Fig. 3. Salt Creek Dome, Natrona County, Wyoming. relation to the strata. In Fig. 3, the closed broken lines represent elevations on the 'Second Wall Creek oil sand'. Faults are represented by broken lines intersecting the contours. The small dots or disks represent well locations and the accompanying numbers represent the depths at which a temperature of 80°F is reached. The heavy continuous lines represent contours on the 80°F isogeothermal surface. Fig. 3 shows clearly that the highest point on the 183
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