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Schlumberger (Wenner) Wenner alpha; Wenner beta; Wenner gamma; Pole-pole; Dipole-dipole; Pole-dipole; Equatorial dipole-dipole; Resistivity. Resistivity measurement of bulk materials is a frequent application of electrode arrays. The figure shows a Wenner array, one of the possible ways of achieving this.
An anticline is an area of the subsurface where the strata have been pushed into forming a domed shape. If there is a layer of impermeable rock present in this dome shape, then hydrocarbons can accumulate at the crest until the anticline is filled to the spill point - the highest point where hydrocarbons can escape the anticline.