Marine SP surveys have been periodically used on reservoirs for several decades.<br>Most surveys have used gradient arrays towed at the surface or at some depth in the<br>water column. Water column gradient arrays are efficient, but at the cost of some<br>sensitivity. Some surveys have used a single fixed electrode and a roving electrode<br>dragged across the reservoir bottom. These surveys have typically been labor<br>intensive and logistically limited. The authors used finite difference models and field<br>trials to evaluate the sensitivity and field productivity of gradient arrays and roving<br>electrode arrays, in the water column and on the reservoir floor, for detecting narrow<br>seepage pathways in a large reservoir.


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