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Drill hole logging with infrared spectroscopy

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Abstract

Infrared spectroscopy has been used to identify rocks and minerals for over 40 years. The technique is sensitive to primary silicates as well as alteration products. Minerals can be uniquely identified based on multiple absorption features at wavelengths from the visible to the thermal infrared. We are currently establishing methods and protocols in order to use the technique for rapid assessment of downhole lithology on samples obtained during drilling operations. Initial work performed includes spectral analysis of chip cuttings and core sections from drill sites around Desert Peak, NV. In this paper, we report on a survey of 10,000 feet of drill cuttings, at 100 foot intervals, from the San Andreas Fault Observatory at Depth (SAFOD). Data from Blue Mountain geothermal wells will also be acquired. We will describe the utility of the technique for rapid assessment of lithologic and mineralogic discrimination.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Drill hole logging with infrared spectroscopy
Volume
29
Year Published:
2005
Language:
English
Larger Work Title:
Transactions - Geothermal Resources Council
First page:
565
Last page:
568
Conference Title:
Geothermal Resources Council 2005 Annual Meeting
Conference Location:
Reno, NV
Conference Date:
25 September 2005 through 28 September 2005