. Early geophysical papers of the Society of Exploration Geophysicists . Depthdn feet) Fig. i.—Results of velocity determinations in three wells. Average velocity from sur- face to given depth is plotted against that depth. divided by this time, gives the average velocity of the section to the depth of the geophone. The velocity so determined is somewhat lower than the average velocity along the actual path of the ray. The actual path of least time is slightly curved and therefore would yield a greater average velocity. The geophone is then lowered to some other depth and another measurement o
. Early geophysical papers of the Society of Exploration Geophysicists . Depthdn feet) Fig. i.—Results of velocity determinations in three wells. Average velocity from sur- face to given depth is plotted against that depth. divided by this time, gives the average velocity of the section to the depth of the geophone. The velocity so determined is somewhat lower than the average velocity along the actual path of the ray. The actual path of least time is slightly curved and therefore would yield a greater average velocity. The geophone is then lowered to some other depth and another measurement of time is secured and the velocity cal- culated. It is these velocities plotted against depths of the geophone below the casinghead which are shown in Figure 1. These curves represent the average velocity of a section from the surface to any depth plotted against that depth. Since the velocity of the first 1,000 feet of material, for example, enters into the velocity 662
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