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Previous HitReservoirNext Hit Geometry of the Regressive Fox Hills Previous HitSandstoneNext Hit:

Control on Aquifer Quality*

By

Marieke Dechesne1 and Robert G. Raynolds1

 

Search and Discovery Article #50025 (2005)

Posted November 27, 2005

 

*Oral Presentation at Rocky Mountain Section AAPG Annual Meeting, Jackson, Wyoming, September 24-26, 2005. Appreciation is expressed to Lyn George, Technical Program Chair, and Don French, for encouraging the authors to submit this presentation.

 

Click to view presentation in PDF format.

 

1Denver Museum of Nature & Science, 2001 Colorado Boulevard, Denver, CO 80205, phone 303-370-6047 ([email protected]).

Abstract 

In the Denver Basin the littoral to nearshore Fox Hills Previous HitSandstoneNext Hit was deposited during the early phase of the Laramide orogeny as the Cretaceous Interior Seaway retreated to the northeast. This approximately 68 MY regressive Previous HitsandstoneNext Hit is composed of a series of shingles reflecting episodic seaway retreat. We illustrate the detailed geometry of the Previous HitsandstoneNext Hit elements that make up the Fox Hills Previous HitSandstoneNext Hit. This unit is an important aquifer in the Denver Basin and the distribution of Previous HitporosityNext Hit, permeability, and facies tracts is important in Previous HitpredictingNext Hit the performance of water wells. 

A database of thousands of oil and gas wells and thousands of water wells is available for study. A subset of these wells has been analyzed to create a three-dimensional model using ArcGIS software. Seven shingles are mapped in detail. Our three dimensional model permits the effective and efficient communication of critical Previous HitreservoirNext Hit parameters to resource planners. Comparisons are made to other well-studied regressive systems in the San Juan and Greater Green River basins. We propose that non-uniform subsidence has influenced the stacking pattern of this regressive succession, controlling both the distribution of net Previous HitsandstoneNext Hit and of coal-bearing strata. These parameters are critical to Previous HitpredictingNext Hit Previous HitreservoirTop performance and quality. The patterns we document are relevant to any effort to extract fluids from rocks of this facies association.

 

Denver Basin and location of study area

 

Source of water supply, Denver Basin area

 

Fox Hills paleogeography