Changes

[[file:predicting-reservoir-system-quality-and-performance_fig9-86.png|thumb|{{figure number|1}} From Sonnenberg.<ref name=Sonnenberg_1985 /> Courtesy Rocky Mountain Association of Geologists.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-86.png|thumb|{{figure number|1}} From Sonnenberg.<ref name=Sonnenberg_1985 /> Courtesy Rocky Mountain Association of Geologists.]]

The Sorrento field reservoir is Pennsylvanian Morrow valley-fill sandstones. As shown in the figure below, structure contours on a marker bed above the Morrow Sandstone reflect the irregular thickness of the sandstone body and a small structural nose and closure. The oil column is [[length::70 ft]] [[depth::(20 m]]) and exceeds structural closure. This is a combination structural-[[stratigraphic trap]]. Fluvial sandstones lap onto marine shale at the margins of the valley, forming lateral seals.

The Sorrento field reservoir is [[Pennsylvanian]] Morrow [[valley-fill sandstone]]s. As shown in the figure below, structure [[contour]]s on a marker bed above the [[Morrow Sandstone]] reflect the irregular thickness of the sandstone body and a small structural [[nose]] and [[closure]]. The oil column is [[length::70 ft]] [[depth::(20 m]]) and exceeds structural closure. This is a combination [[Structural trap system|structural]]-[[stratigraphic trap]]. [[Lithofacies_and_environmental_analysis_of_clastic_depositional_systems#Braided_and_meandering_fluvial_deposits|Fluvial sandstones]] lap onto marine shale at the margins of the valley, forming lateral [[seal]]s.

In [[:file:predicting-reservoir-system-quality-and-performance_fig9-86.png|Figure 2]], circled wells represent Marmaton wells; triangles, Mississippian wells; and large X's, study wells. The rest of the oil wells produce from the Morrow. Each unit in the grid is 1 sq mi.

In [[:file:predicting-reservoir-system-quality-and-performance_fig9-86.png|Figure 2]], circled wells represent Marmaton wells; triangles, Mississippian wells; and large X's, study wells. The rest of the oil wells produce from the Morrow. Each unit in the grid is 1 sq mi.