Changes

==Structure==

==Structure==

The oil accumulation at Yowlumne is controlled in part by an anticlinal closure formed during Miocene-Pliocene deformation of the south basin margin. Yowlumne Unit A was created to waterflood the area of structural closure, but subsequent drilling established production in a stratigraphic accumulation on the north-dipping flank of the anticline also ([[:file:Mth14ch02f01.jpg|Figure 1]]). Consequently, Yowlumne Unit B was created to flood the flank accumulation (Burzlaff,<ref name=Burzlaff_1983>Burzlaff, A. A., 1983, Unitizing and waterflooding the California Yowlumne oil field: Society of Petroleum Engineers, SPE 11685, p. 187-194.</ref> Metz and Whitworth<ref name=Metzandwhitworth_1984>Metz, R. T., and J. L. Whitworth, 1984, Yowlumne oil field, ''in'' G. W. Kendall and S. C. Kiser, eds., Selected papers presented to San Joaquin Geological Society, v. 6, p. 3-23.</ref>). Thus, the field is a combination structural-stratigraphic trap.

The oil accumulation at Yowlumne is controlled in part by an anticlinal closure formed during Miocene-Pliocene [[deformation]] of the south basin margin. Yowlumne Unit A was created to waterflood the area of structural closure, but subsequent drilling established production in a stratigraphic accumulation on the north-dipping flank of the anticline also ([[:file:Mth14ch02f01.jpg|Figure 1]]). Consequently, Yowlumne Unit B was created to flood the flank accumulation (Burzlaff,<ref name=Burzlaff_1983>Burzlaff, A. A., 1983, Unitizing and waterflooding the California Yowlumne oil field: Society of Petroleum Engineers, SPE 11685, p. 187-194.</ref> Metz and Whitworth<ref name=Metzandwhitworth_1984>Metz, R. T., and J. L. Whitworth, 1984, Yowlumne oil field, ''in'' G. W. Kendall and S. C. Kiser, eds., Selected papers presented to San Joaquin Geological Society, v. 6, p. 3-23.</ref>). Thus, the field is a combination structural-stratigraphic trap.

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