. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. APPLICATIONS OF DIP SHOOTING 131 This rule may be used only where the point of maximum displacement lies within the area under examination. If the fault dies out within the area prospected the upthrown side may be distinguished by the following rule. If the observer places himself on the down thrown side of the fault, facing the fault, positive misclosures in the successive traverses which the fault cuts will increase toward the right, while negative misclosures will increase toward the left. If nei
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. APPLICATIONS OF DIP SHOOTING 131 This rule may be used only where the point of maximum displacement lies within the area under examination. If the fault dies out within the area prospected the upthrown side may be distinguished by the following rule. If the observer places himself on the down thrown side of the fault, facing the fault, positive misclosures in the successive traverses which the fault cuts will increase toward the right, while negative misclosures will increase toward the left. If neither the end nor the point of maximum displacement of the fault lies within the traversed areas, the direction of throw can not be determined, as the points of maximum positive and negative misclosure lie approximately **//*. MISCLOSURE IN FEET TOTAL OIP IN FEET ALONG PART OF TRAVERSEV FIGURE Lee e no SHOT POINT O WELL O PROBABLE FAULT —- SCALE ;= I MILE Fig. 5.—Structure contour map of faulted salt dome showing effect of differential dis- placement on closure of traverses. Contour elevations below sea-level. midway between the point of maximum displacement and the ends of the fault. Therefore the misclosures will all be of like sign in the case postulated, and the amount of misclosure will decrease either toward the end of the fault, or toward the point of maximum dis- placement, or both, the two directions being indistinguishable under the circumstances. In all of the work examined only two cases of misclosure which the writers considered justifiably attributable to faulting were found. One of these cases is used here as an illustration of the principles already outlined. A portion of the structure-contour map built up on dip- reflection data is shown in Figure 5. The significant closed traverses are also given, and the amount of misclosure is written in the center of each. The fault was first suspected because of the progressive values 653. Please note that these
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