Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 42 C. E. VAN ORSTRAND beyond which the curve is slightly convex towards the depth axis. Another point of interest is the fact that the excess of annual mean soil temperature just beneath the surface of the ground over annual mean air temperature just above the surface of the ground (a-b, Fig. 6), amounts to more than 7°F. This large discontinuity in the depth temperature curves at the surface of the ground is typical of oil field areas in Southern California
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 42 C. E. VAN ORSTRAND beyond which the curve is slightly convex towards the depth axis. Another point of interest is the fact that the excess of annual mean soil temperature just beneath the surface of the ground over annual mean air temperature just above the surface of the ground (a-b, Fig. 6), amounts to more than 7°F. This large discontinuity in the depth temperature curves at the surface of the ground is typical of oil field areas in Southern California. Correction for Surface Topography The longitudinal section of the Long Beach field, Fig. 7, shows at once that the total rise in the isothermal surfaces as they pass over the dome and beneath the hill can not be explained on the basis of normal cooling; for, the H = 360 feet = * b = 3 aSH=/jeS/eet-422JS meters d = meters fpti - a = 'Cper cm. - C/°C,n?SSS meters-/°r,nS3S6teet) a- - OOOOOSXpercm. - P'C m TOO meters ./•Fin36*5 feet c, - OBS22SI c1-L64/£S4cmsper'r G//< DISTANCE EffOM CENTRAL PLANE Of B/DGE. /N EEET Fig. 8. Transverse section of Long Beach Dome showing computed isotherms. fact that the thermal surfaces are steeper and show a greater rise from the lowest to the highest points than the topographic surface above them proves conclusively that we are not dealing with a normal flow of heat towards the surface of the earth. In order to form an estimate of the discrepancy resulting from this abnormality, use will be made of the equations given by Referring to Fig. 8, let the axis of x be taken at sea level, with the origin o directly beneath the apex of the symmetrical hill. Elevations above sea level are negative; below, positive. As the hill or mountain is assumed to be a ridge which is very long in comparison with its cross-section, the problem is re- duced at once to the flow of heat in t
Size: 1912px × 1046px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
