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Several observations demonstrate that compartmentalization in the field also exists on larger scales.
Several observations demonstrate that compartmentalization in the field also exists on larger scales.
* The reservoir in Yowlumne Unit A has, over time, consistently exhibited reservoir pressures that differ from those in the same interval in Unit B ([[:file:Mth14ch02f06.jpg|Figure 6]]).
* The reservoir in Yowlumne Unit A has, over time, consistently exhibited reservoir pressures that differ from those in the same interval in Unit B ([[:file:Mth14ch02f06.jpg|Figure 6]]).
* Gross sandstone isopach maps indicate separate northern (Unit B) and southern (Unit A) depocenters (loci of thickening), which appear to represent different depositional accumulations ([[:file:Mth14ch02f07.jpg|Figure 7]]).
* Gross sandstone isopach maps indicate separate northern (Unit B) and southern (Unit A) [[depocenters]] (loci of thickening), which appear to represent different depositional accumulations ([[:file:Mth14ch02f07.jpg|Figure 7]]).
* Because sandstones in Unit B have more quartz, less clay, and higher original porosity than the equivalent sandstones in Unit A, different depositional histories are indicated (Whelan<ref name=Whelan_1984>Whelan, H. T. M., 1984, Geostatistical estimation of the spatial distributions of porosity and percent clay in a Miocene Stevens turbidite reservoir: Yowlumne field, California: Master's thesis, Stanford University, Stanford, California, 126 p.</ref>).
* Because sandstones in Unit B have more quartz, less clay, and higher original porosity than the equivalent sandstones in Unit A, different depositional histories are indicated (Whelan<ref name=Whelan_1984>Whelan, H. T. M., 1984, Geostatistical estimation of the spatial distributions of porosity and percent clay in a Miocene Stevens turbidite reservoir: Yowlumne field, California: Master's thesis, Stanford University, Stanford, California, 126 p.</ref>).
* The oil-water contact in Unit B is 660 m (2180 ft) structurally lower than the contact in Unit A ([[:file:Mth14ch02f05.jpg|Figure 5]]).
* The oil-water contact in Unit B is 660 m (2180 ft) structurally lower than the contact in Unit A ([[:file:Mth14ch02f05.jpg|Figure 5]]).