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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The methods of comparing gravity data are discussed with regard to their usefulness for petroleum exploratory work. In flat plains of slight relief any anomaly may be used almost as satisfactorily as any other. However, the "free-air" anomaly has the obvious advantage that it involves the least trouble in calculation. But in regions of considerable relief, such as mountains and dissected plateaus, the only serviceable anomalies are the topographic and Bouguer anomalies. The latter is a satisfactory, practical substitute for the former, which is difficult to compute. All the "isostatic" anomalies are unsatisfactory in rugged topography on account of their assumptions regarding subsurface density conditions, to say nothing of the great difficulty of computation. The free-ai anomaly is also unfit for such terranes.
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