Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 DEPTHS FROM SEISMIC TIME-TRAVEL CURVES 127 second beds for each of these points and subtract the corresponding time interval for each point. Then draw the two new time-travel curves through these points. The slopes of these two new curves will give the dip of the surface of the F4 bed relative to the surface of the Vz bed. The above action will, of course, rotate the plot of the time- travel curves through an angle 6 so that the abscissa, or distance axis, wi
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 DEPTHS FROM SEISMIC TIME-TRAVEL CURVES 127 second beds for each of these points and subtract the corresponding time interval for each point. Then draw the two new time-travel curves through these points. The slopes of these two new curves will give the dip of the surface of the F4 bed relative to the surface of the Vz bed. The above action will, of course, rotate the plot of the time- travel curves through an angle 6 so that the abscissa, or distance axis, will be parallel to the secondary surface, which is the surface of the Vz layer, and the coordinates of the time-travel curves must be read ac- StcMtJrrSHJZ/' sxsr UAiesrcwE Vf=5BM Fig. 4.—The time-travel curves obtained from actual data taken from records shot in an area in West Texas, and the resulting profile calculated according to the method described in this paper. cordingly. With this action accomplished, the procedure is the same as for the case of a single dipping layer. The dip angle calculated in the usual manner will be the angle of dip between the surfaces of the Vz and Vi beds, and the values of h and k will be the thickness of the V3 bed under the secondary s hot points on the surface of this bed. The true velocity of F4 can be calculated in the same manner as Vz was previ- ously determined; and if the result is not in good agreement with the assumed value of Vi} a new value for this quantity can be assumed and the entire procedure repeated. A high degree of accuracy can be 787
Size: 1531px × 1306px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
