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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Equations are given for tilted fluid contacts tilted by moving water, and for those tilted by moving oil with stationary water. The equations describe the relations between the angle of tilt, the horizontal gradients in head or pressure, the speed of flow, the permeability, and the viscosity. These equations may be used to analyze the field data to determine the cause of the tilts in given cases. Although some laboratory data suggest that capillary phenomena may produce tilted or irregular contacts, the field data suggest that the effect of variations in pore size is in most cases unimportant. However, in some fields, such as Wasson, West Texas, capillary relations may cause the tilts of the oil-water contacts. Some tilted contacts appear to be produced by structural tilt ng of level contacts which have been sealed or made immobile by chemical reactions that produce solids.
Tilted fluid contacts produced by moving water are termed dynamic, and those produced by all other causes, including moving oil, static. East of a line from Corpus Christi to the middle of the north border of Kansas, the tilted fluid contacts appear to be of static origin. West of this line, some of the tilts in the Mid-Continent region may be static, some dynamic. The tilted fluid contacts most likely to be caused by moving water are in the Carrizo and Wilcox sandstones of South Texas.
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