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Elemental Analysis of the Barnett Shale Using X-Ray Fluorescence Spectrometry, Ft Worth Basin, Johnson County, Texas.

Meredith Kiesel, Dr. Helge Alsleben, and Milton Enderlin
Department of Geology: Texas Christian University, Ft. Worth Texas

Energy-dispersive x-ray fluorescence (ED-XRF) is a technique used in a wide variety of disciplines to provide an analytical elemental perspective. More specifically, within the field of geology, XRF is a method to characterize rocks and investigate major and trace elements in a given sample. This easy to use, portable piece of machinery is advantageous because it requires minimal sample preparation, provides quick analysis time, and is relatively cost-effective and non-destructive to the samples. XRF is capable of producing results that are analogous to those that can be obtained through full-scale xray diffraction (XRD). The EOG Two-O-Five #2H in Johnson County, Texas is a Mississippian Barnett Shale core within the Fort Worth Basin. Selective intervals of the core have been identified based on unique or noteworthy features such as calcitic concretions, pyrite specks and lenses, and laminated layers. Statistical calculations and graphing were employed to find any meaningful relationships and supplement the other results from the study. XRD data have previously been gathered for the Two-O-Five #2H and Rock-Eval pyrolysis has been taken at one-foot intervals throughout the core, as well as thin sections for petrographic analysis, and a suite of petrophysical well logs. By utilizing the data already gathered, in conjunction with the results of XRF testing and density measurements, a potentially significant means of comparison will be available for continued analysis. This study will demonstrate the capabilities that XRF can provide for core analysis and illustrate that geochemical data can be used for modeling the mineralogy of rock samples.


AAPG Search and Discovery Article #90152©2012 AAPG Southwest Section Meeting, Fort Worth, Texas, 19-22 May 2012