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Gravity, magnetic, and electrical methods of prospecting can be useful in exploration for pinchout and reef traps. A pinchout zone might produce a recognizable gravity anomaly as a result of the density contrast (1) between the porous sandstone and the adjacent beds or (2) between the water-saturated and oil-saturated parts of the sandstone section. Reefs also can produce gravity anomalies as a result of differences in density between the reef material and the laterally adjacent beds--whether these beds are salt, limestone, or shale. Where the reef is in shale, compaction of the shale in the area adjacent to and above the reef is an important factor. Magnetic methods are useful where basement structure is a factor in formation of stratigraphic traps. The use of electrical methods in exploring for stratigraphic traps is much less promising. Overall, however, these potential methods have possibilities for application in the search for certain types of stratigraphic traps.
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