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The effects of indigenous and introduced microbes on deeply buried hydrocarbon reservoirs, North Sea

Published online by Cambridge University Press:  09 July 2018

I. Spark ,
I. Patey ,
B. Duncan ,
A. Hamilton ,
C. Devine  and
C. McGovern-Traa
I. Spark*
Affiliation:
Corex (UK) Ltd, Units B1-B3 Airport Industrial Park, Howe Moss Drive, Dyce, Aberdeen, AB21 0GL
I. Patey
Affiliation:
Corex (UK) Ltd, Units B1-B3 Airport Industrial Park, Howe Moss Drive, Dyce, Aberdeen, AB21 0GL
B. Duncan
Affiliation:
Corex (UK) Ltd, Units B1-B3 Airport Industrial Park, Howe Moss Drive, Dyce, Aberdeen, AB21 0GL
A. Hamilton
Affiliation:
Department of Molecular and Cell Biology, Institute of Medical Sciences, University of Aberdeen, Ashgrove Road West, Foresterhill, Aberdeen AB25 2ZD, UK
C. Devine
Affiliation:
Department of Molecular and Cell Biology, Institute of Medical Sciences, University of Aberdeen, Ashgrove Road West, Foresterhill, Aberdeen AB25 2ZD, UK
C. McGovern-Traa
Affiliation:
Department of Molecular and Cell Biology, Institute of Medical Sciences, University of Aberdeen, Ashgrove Road West, Foresterhill, Aberdeen AB25 2ZD, UK
*
*E-mail: ispark@corex.co.uk
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Abstract

Anaerobic bacteria were identified in live drilling muds and cores from nine different North Sea and Irish Basin oilfields, varying in depth from 3500 to 15000 ft, and at temperatures up to 150°C. The anaerobic bacteria may be introduced into the reservoir during drilling operations or injection of water, but in many cases the bacteria are indigenous to the oilfield reservoirs. Confirmation of the indigenous anaerobic bacteria was made using molecular biology techniques (16S rDNA sequence analysis), comparing microbial populations present in the blank drilling mud as supplied to wellsite, in the live drilling mud taken during coring, and in the live core. The role of anaerobic bacteria in oilfield diagenesis is not fully understood, though pyrite precipitation, and exopolymer and H2S gas production were noted in this study, up to temperatures of 95°C.

Keywords

North Seamicrobeshydrocarbon reservoirs
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 1 , March 2000 , pp. 5 - 12
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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