of Olefin Based Drilling Fluid Contaminates
Geologic Materials for SAR Analyses
the last few years we have seen an increase
in the use of hydrocarbon based mud systems.
These drilling muds provide a source of immense
contamination and interference with normal
Resolution, Inc. worked to develop a procedure
that separated Olefin based Nova Plus mud
filtrate from bitumens and oils and produce
SAR fractions that are suitable for biomarker
and carbon isotope analyses.
Approach - Traditional SARA analysis incorporates
topping of the sample in order to stabilize
the aliquot prior to extraction and analysis.
Therefore, extreme topping was utilized to
determine if the contaminants could be removed
during the topping process.
with over 70 weight percent topping loss
a significant amount of contamination remains.
of biomarker ions reveals some differences
between samples but no significant improvement.
procedure may be useful for samples containing
low concentrations of biomarkers but generally
will provide little improvement in display
of the biomarker distributions.
fractions are not suitable for
carbon isotope analysis (though they may
be marginally suitable if topped longer).
Approach - Baseline
Resolution developed a Selective Olefin Adsorption
Process (SOAP) which used proprietary
processes to remove the Nova Plus olefins
from the sample.
chromatogram is the same sample shown previously,
but after the SOAP clean-up. Note in the
second analysis, after clean-up, the alkane
concentrations remain the same, but look
larger, because the Nova Plus contamination
has been removed.