Title:

A New Wyoming Basin Produced Waters REE Normalization and Its Application

Authors:

Charles NYE, Davin BAGDONAS, Scott QUILLINAN

Key Words:

rare earth elements, REE, value-added, Wyoming, normalization, WBPW, water-rock interaction

Conference:

Stanford Geothermal Workshop

Year:

2018

Session:

Geochemistry

Language:

English

Paper Number:

Nye

File Size:

1316 KB

View File:

Abstract:

We propose a new rare earth element (REE) normalization using 38 samples of Wyoming Basin Produced Waters (WBPW) and apply it for aqueous REE interpretation. These waters were analyzed for aqueous REEs at Idaho National Laboratories (INL) and a unimodal gaussian fitted to the data. The result is appropriate for use with deep basin brines such as geothermal and hydrocarbon-bearing waters. The new WBPW normalization is structurally similar to North American Shale Composite (NASC, Gromet et al, 1984). However, like the North Pacific Deep Water (NPDW, Alibo and Nozaki, 1999), it is appropriate for parts per trillion REE concentrations, whereas NASC is appropriate for parts per million. The WBPW differs significantly from both the NASC and NPDW in its treatment of the redox-sensitive REEs cerium and europium. By normalizing other samples - which were not used in the calculation of the WBPW - we can show meaningful structure in REE water patterns such as those from high-temperature carbonate reservoirs. Previous work noted that Wyoming's Wind River and Powder River Basins were easily distinguished by their contrasting gadolinium anomaly (Gd/Gd*). Twelve new samples from the Green River and Washakie Basins have Wind River Basin-like gadolinium behavior. These new samples suggest that the Powder River Basin is anomalous among Wyoming basins, and that aqueous Gd enrichment is less common than previously thought. This revision points to reactions with the reservoir rock being the primary factor in aqueous REE behavior, and partitions our samples into two main groups: waters from reservoirs of dominantly continental-petrogenesis and waters from reservoirs of dominantly marine-petrogenesis. Rocks from continental-petrogenesis or marine-petrogenesis appear to transfer a different Light REE - Heavy REE (LREE - HREE) behavior to reservoir water. A sub-group of three waters in the marine-petrogenesis group exhibit a unique “steep” HREE-enrichment behavior. Contributors: Yuriy GANSHIN, Travis MCLING, Ghanashyam NEUPANE, Fred MCLAUGHLIN


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