Geofluids

Research Article

Simulating the Evolution of Fluid Underpressures in the Great Plains, by Incorporation of Tectonic Uplift and Tilting, with a Groundwater Flow Model

Table 5

Hydraulic conductivities of the (10) geohydrologic units (layers) of each model in the sequence. Hydraulic conductivities in meters per day (m d−1). In units (1)–(7), the vertical hydraulic conductivity is set to one-tenth the value of the horizontal hydraulic conductivity . In units (6) and (7), a low- choke separates more permeable units in the west and east. In unit (8), is higher in the east than in the west.
Geohydrologic unit (m d−1) (m d−1)
Ogallala 1 × 10−6/10
Tertiary sediments 1 × 10−6/10
(3) Pierre 1 × 10−6/10
(4) Dakota 1 × 10−6/10
(5) Morrison-Leonardian 1 × 10−6/10
 WestChokeEast 
(6) Wolfcampian—choke from 407 to 482 km5 × 10−41 × 10−45 × 10−4/10
(7) Virgilian-Missourian—choke from 375 to 393 km5 × 10−41 × 10−45 × 10−4/10
(8) Desmoinesian  
 Low K west of 315 km 1 × 10−9 west of 315 km2 × 10−10
 High K east of 315 km 5 × 10−3 east of 315 km2 × 10−10
(9) Basal Pennsylvanian1 × 10−9  2 × 10−10
(10) Mississippian5 × 10−3  2 × 10−10