Infrared (IR) Spectroscopy is an analytical method that measures the dipole movements of species as they vibrate or rotate. The infrared portion of the electromagnetic spectrum ranges from .78 to 1000 micrometers (12800 to 10 cm-1). IR is split into three regions: near, mid, and far. Most of the absorbance regarding organic and inorganic material will be in the mid and far regions. The mid-IR region ranges from 4000 to 200 cm-1. This region includes a combination of clays, organics, carbonates, and other mineral species. The far-IR region ranges from 200 to 10 cm-1. This region can be used to supplement the middle IR region in identifying and characterizing specific minerals within a group. Infrared analysis of geological material initiated in the 1950s; however, few attempts have been made to amalgamate all mineral components into a universal model. The development of such a model requires the tedious task of deconvoluting each spectrum and comparing minute changes in both mid and far range. Recent instrumentation and computer modeling additions to the FTIR platform make complex deconvolutions of high-resolution spectra possible, at a fraction of the traditional time and effort. This modeling capability allows the correlation of TOC, XRD, XRF, and pyrolysis data to complex IR spectra. The resultant model provides a rapid overview of the elemental composition, mineralogy, and source rock appraisal. A FTIR-based mineral model was created by characterizing cuttings samples from five Delaware Basin wells, spanning the Wolfcamp D through Avalon stratigraphic interval. The model was created using five major groups: TOC, tectosilicates, total clays, total carbonates, phyllosilicates. These five groups were split into additional components: Quartz, K-spar, Plagioclase, Pyrite, Calcite, Dolomite, Albite, Mica, Rutile, Chlorite, and Apatite. The model includes 35 XRF, 35 TOC, 35 XRD, and 35 pyrolysis analyses. The correlation coefficient for each major group were greater than .99 except for TOC which was at .92. The compiled components ranged from .90 to .99.

Rapid characterization of strata in the Delaware Basin by FTIR modelling

2019 Spring National Meeting

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