Changes

==Impact of container quality and drive==

==Impact of container quality and drive==

The diagram below is a cross section of a reservoir system in an unconformity truncation trap. The reservoir system contains two different containers characterized by pore systems of different quality. Flow units 1 and 3 are microporous; flow units 2 and 5 are mesoporous; and flow unit 4 is macroporous. Container 1 is comprised of flow units 4 and 5 and part of 3. It has a strong water drive. Container 2 is comprised of flow units 1, 2, and part of 3. It has a partial water drive. The boundary between containers 1 and 2 is where fluid flow diverges in flow unit 3. Container 1 is of higher quality in terms of performance capability.

[[:file:predicting-reservoir-system-quality-and-performance_fig9-4.png|Figure 1]] is a cross section of a reservoir system in an unconformity truncation trap. The reservoir system contains two different containers characterized by pore systems of different quality. Flow units 1 and 3 are microporous; flow units 2 and 5 are mesoporous; and flow unit 4 is macroporous. Container 1 is comprised of flow units 4 and 5 and part of 3. It has a strong water drive. Container 2 is comprised of flow units 1, 2, and part of 3. It has a partial water drive. The boundary between containers 1 and 2 is where fluid flow diverges in flow unit 3. Container 1 is of higher quality in terms of performance capability.

Three wells in the figure drain the reservoir. Next to each well is a decline curve. We can consider how container quality and drive affect well performance:

Three wells in the figure drain the reservoir. Next to each well is a decline curve. We can consider how container quality and drive affect well performance:

==Flow units, facies, and containers==

==Flow units, facies, and containers==

[[file:predicting-reservoir-system-quality-and-performance_fig9-5.png|thumb|{{figure number|4}}.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-5.png|thumb|{{figure number|4}}]]

The stratigraphic cross section in [[:file:predicting-reservoir-system-quality-and-performance_fig9-5.png|Figure 4]] shows the facies and flow units present in the Hartzog Draw field of Wyoming. The producing formation is the Upper Cretaceous Shannon Sandstone, composed of fine- to medium-grained clayey and glauconitic sandstones deposited as marine shelf bars. Notice how facies and flow units do not always correspond, especially within the central bar facies. The flow units in this section of Hartzog Draw behave as a unit; therefore, only one container is present.

The stratigraphic cross section in [[:file:predicting-reservoir-system-quality-and-performance_fig9-5.png|Figure 4]] shows the facies and flow units present in the Hartzog Draw field of Wyoming. The producing formation is the Upper Cretaceous Shannon Sandstone, composed of fine- to medium-grained clayey and glauconitic sandstones deposited as marine shelf bars. Notice how facies and flow units do not always correspond, especially within the central bar facies. The flow units in this section of Hartzog Draw behave as a unit; therefore, only one container is present.