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Abstract
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Tucker,
J., and D. Hitzman, 1996, Long-term and seasonal trends in the response
of hydrocarbon-utilizing microbes to light hydrocarbon gases in shallow
soils, in D. Schumacher and M. A. Abrams, eds., Hydrocarbon migration
and its near-surface expression: AAPG Memoir 66, p. 353-357. |
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Chapter
26
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Long-Term
and Seasonal Trends in the Response of Hydrocarbon-Utilizing Microbes to
Light Hydrocarbon Gases in Shallow Soils |
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James Tucker
Daniel Hitzman
Geo-Microbial Technologies
Ochelata, Oklahoma, U.S.A.
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Abstract
The use of population
variations in hydrocarbon-utilizing microorganisms as a surface geochemical
exploration technique for oil and gas has been vigorously studied since
the 1940s. The Microbial Oil Survey Technique (MOST) was developed by Phillips
Petroleum Company in the 1950s and held proprietary until 1985. In the
development of the methodology, Phillips periodically sampled a particular
test traverse over known production near Bartlesville, Oklahoma, beginning
in 1957. Geo-Microbial Technologies (GMT) continued to sample the test
traverse beginning in 1986. In addition to the yearly sampling, the test
traverse was sampled monthly in 1993 by GMT to determine if seasonal variations
affect the specific suite of microorganisms measured in MOST. Although
slight changes in the absolute microbial concentrations did occur through
the seasons, after factoring out oil production effects, the trend in microbial
highs and lows across the test traverse remained constant . In the monthly
surveys throughout 1993, of all the seasonal and weather factors tracked,
only soil moisture content seemed to correlate with the monthly change
in absolute microbial counts. Microbial lineplots covering this 37-year
period demonstrate the continuous nature of hydrocarbon microseepage over
a known hydrocarbon accumulation and the reproducibility of associated
microbial prospecting. |
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