Changes

==Interpreting fault location==

==Interpreting fault location==

[[file:using-magnetics-in-petroleum-exploration_fig14-11.png|thumb|{{figure number|3}}Details from Gatewood.<ref name=ch14r2>Gatewood, L., 1983, Viola–Bromide and Oil Creek Structure (map): Oklahoma City, privately sold and distributed.</ref>]]

[[file:using-magnetics-in-petroleum-exploration_fig14-11.png|300px|thumb|{{figure number|3}}Residual magnetic map of another area in northern Oklahoma with faults superimposed. Details from Gatewood.<ref name=ch14r2>Gatewood, L., 1983, Viola–Bromide and Oil Creek Structure (map): Oklahoma City, privately sold and distributed.</ref>]]

[[:file:using-magnetics-in-petroleum-exploration_fig14-11.png|Figure 3]] is a residual magnetic map of another area in northern Oklahoma with faults superimposed. Here the sedimentary section is approximately [[length::2 km]] (6500 ft) thick, and the flight level was about [[length::2.3 km]] (7500 ft) above basement. The faults shown were interpreted from a detailed subsurface study by Geomap Inc. The faults were mapped about [[length::500 m]] (1600 ft) above basement and show 30–90 m (100–300 ft) of displacement. Note the high degree of correlation between these faults and the residual magnetic gradients corresponding to the interpreted basement shear zones. Some 64% of the total length of faults, in fact, lies on the predicted shear zones following magnetic gradients. Note also that many magnetic gradients in Figure 14-11 show no faults cutting the section. These may not have been reactivated.

[[:file:using-magnetics-in-petroleum-exploration_fig14-11.png|Figure 3]] is a residual magnetic map of another area in northern Oklahoma with faults superimposed. Here the sedimentary section is approximately [[length::2 km]] (6500 ft) thick, and the flight level was about [[length::2.3 km]] (7500 ft) above basement. The faults shown were interpreted from a detailed subsurface study by Geomap Inc. The faults were mapped about [[length::500 m]] (1600 ft) above basement and show 30–90 m (100–300 ft) of displacement. Note the high degree of correlation between these faults and the residual magnetic gradients corresponding to the interpreted basement shear zones. Some 64% of the total length of faults, in fact, lies on the predicted shear zones following magnetic gradients. Note also that many magnetic gradients in Figure 14-11 show no faults cutting the section. These may not have been reactivated.