T11 Urban Geochemistry

Sunday, 15 October 2023
8:00 AM - 12:00 PM
325

GEOCHEMICAL CHARACTERIZATION OF THE LODGEPOLE FORMATION IN NORTH DAKOTA: IMPLICATIONS FOR GEOTHERMAL EXPLORATION

Paper number: T11-3
Program: Technical Sessions
Time: 8:20 AM – 8:35 AM

Authors

Abstract

This research presents a comprehensive investigation of the Lodgepole Formation's geochemistry in North Dakota with a primary focus on its potential for geothermal exploration. While the Lodgepole Formation is well-known for its oil-producing capacity, its carbonate complexity has received limited attention compared to other hydrocarbon resources. This study expounds on the complex mineralogy of this formation through advanced geochemical analysis techniques and access its suitability for geothermal energy extraction.

Through mineralogical analysis, this study identifies a diverse range of minerals, namely aragonite, calcite, dolomite, and gypsum, among others, and also throws light on their interactions with subsurface geothermal fluids. The presence and dissolution of evaporitic minerals contribute to elevated salinity levels that potentially affect reservoir porosity and permeability, crucial factors in geothermal exploration.

Results of the geochemical analysis provide critical insights into the evolution of the Lodgepole Formation and their implications to support geothermal exploration and development. This work reveals significant concentrations of chloride and sulfate ions accompanied by notable levels of sodium and calcium which play crucial roles in governing geothermal fluid behavior within the formation. Additionally, unexpected low pH levels were observed during the characterization, presenting a noteworthy aspect of fluid behavior that can impact infrastructure integrity through corrosion, scaling, and reservoir alteration.

This research significantly contributes to our understanding of carbonate geochemistry in formations that contain oil and explores its relevance in exploration. The presence of chloride, sulfate, and pH levels may pose challenges for extracting geothermal energy, necessitating the development of tailored approaches for development in such settings. Moreover, the insights obtained from this study can serve as a valuable framework for conducting further investigations in regions with similar characteristics, ultimately contributing to the advancement of geothermal exploration techniques as a whole.

Geological Society of America Abstracts with Programs. Vol. 55, No. 6

doi: 10.1130/abs/2023AM-394546

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