Changes

==Laying out seismic programs==

==Laying out seismic programs==

[[file:using-magnetics-in-petroleum-exploration_fig14-13.png|thumb|{{figure number|2}}Basement fault block pattern.]]

[[file:using-magnetics-in-petroleum-exploration_fig14-13.png|300px|thumb|{{figure number|2}}Basement fault block pattern.]]

Suppose we have developed a basement fault block pattern as shown in [[:file:using-magnetics-in-petroleum-exploration_fig14-13.png|Figure 2]]. Also suppose this area has been tectonically active and is characterized by a fair degree of faulting. This being the case, we can expect that many of the basement shear zones have been reactivated and are now the locus of faults and fractures in the sedimentary section. Thus, A, D, and F in [[:file:using-magnetics-in-petroleum-exploration_fig14-13.png|Figure 2]] are the wrong places to run 2-D seismic lines because of the probable poor seismic definition due to fracturing along these zones and the possibility of sideswipe. Lines B, C, and E, on the other hand, are good places to run seismic surveys because of the probable lack of fracturing and faulting at these localities. In addition, gravitational compaction structures are generally found within these blocks; thus, line B or C would have found West Campbell field (WCF) but Line A would not.

Suppose we have developed a basement fault block pattern as shown in [[:file:using-magnetics-in-petroleum-exploration_fig14-13.png|Figure 2]]. Also suppose this area has been tectonically active and is characterized by a fair degree of faulting. This being the case, we can expect that many of the basement shear zones have been reactivated and are now the locus of faults and fractures in the sedimentary section. Thus, A, D, and F in [[:file:using-magnetics-in-petroleum-exploration_fig14-13.png|Figure 2]] are the wrong places to run 2-D seismic lines because of the probable poor seismic definition due to fracturing along these zones and the possibility of sideswipe. Lines B, C, and E, on the other hand, are good places to run seismic surveys because of the probable lack of fracturing and faulting at these localities. In addition, gravitational compaction structures are generally found within these blocks; thus, line B or C would have found West Campbell field (WCF) but Line A would not.