Method for detecting hydrocarbons in geological strata
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United States of America Patent
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Apr 21, 2009
Grant Date -
Mar 22, 2007
app pub date -
Sep 29, 2004
filing date -
Oct 6, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method analyzes the hydrocarbon composition of geological strata. The method includes an analysis of gaseous hydrocarbon concentrations contained in drilling muds. According to the method, for a given depth range, gaseous hydrocarbon concentration ratios are established in pairs at essentially-identical depths. Subsequently, a sub-set of the ratios is selected in order to form a signature that is representative of the gaseous hydrocarbon composition of the depth range. The aforementioned signature is defined by the at least one straight line representing the concentration of a first gaseous hydrocarbon in relation to the concentration of a second hydrocarbon. The signature is then compared to reference signatures in order to determine the hydrocarbon concentration of the geological stratum corresponding to the depth range.
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