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Aquifer Mapping Program modeling Delaware Basin aquifers

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Map showing Pecos Slope (orange) and Delaware Basin (blue) study areas in southeastern New Mexico.
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Pecos Slope three-dimensional model showing subsurface geology and aquifer systems. This project will produce a similar model for the Delaware Basin.

Delaware Basin, NM
— July 17, 2020

The Aquifer Mapping Program at the New Mexico Bureau of Geology and Mineral Resources is partnering with the New Mexico Energy, Minerals and Natural Resources Department’s Oil Conservation Division (OCD) to produce three-dimensional maps of aquifer systems in the Delaware Basin in southeastern New Mexico that will support regulation and permitting.

“The Aquifer Mapping Program is working towards mapping all of the major aquifers in New Mexico in 3D using ArcGIS [Geographic Information Systems],” said Aquifer Mapping Program Manager Laila Sturgis. “We recently completed a model of the Pecos Slope region. The new Delaware Basin model will extend that model south to the state line.”

The project will focus on the thickness, extent, and volume of the shallow aquifers within the greater Delaware Basin, including the Capitan Reef freshwater aquifer. If sufficient data can be obtained, the project may expand to include the deeper Rustler and Dewey Lake/Santa Rosa Formation Aquifers.

“The Oil Conservation Division is committed to protecting our environmental resources and collecting better data is one way to ensure we’re working efficiently and in line with the realities on the ground,” said Oil Conservation Division Director Adrienne Sandoval. “The aquifer mapping project will allow the OCD to better protect New Mexico’s precious water resources and is a great example of state agencies partnering to accomplish ambitious goals.”

The geologic framework of the region serves as the base for the 3D models. The geologic model will be constructed using existing geologic reports, supplemented by analyzing approximately 1,500 new geophysical well logs provided by the Oil Conservation Division. The initial geologic and hydrologic model development will allow Bureau scientists to pinpoint data-poor areas to target for additional data collection.

“The high density of data that the OCD well logs provide in this region allow us to troubleshoot our models and understand limitations we may face as we move into much more data poor regions of the state,” said Sturgis.

A multi-year field campaign will complement the existing subsurface data. New data collected will include water level measurements in approximately 100 wells and water quality measurements in 40 wells.

Water level data allow hydrogeologists at the Bureau to better understand long-term aquifer responses to pumping, precipitation, and evapotranspiration trends. Current water quality data can shed light on the locations of groundwater recharge, the age of the groundwater, flow directions, and whether there is flow between multiple aquifers.

In 3D models, water quality data can demarcate freshwater and saline water boundaries in the subsurface. The models produced by the Bureau will support permitting and monitoring efforts in the basin.

For more information, contact Aquifer Mapping Program Manager Laila Sturgis at laila.sturgis@nmt.edu