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 Geochemical researches for
oil and gas prospecting have been applied in
Russia from the late fifties. For almost half a
century it was consistently improved and it is now
applied as an independent method at various stages
of prospecting.
The main principle of research is
studying hydrocarbon gases, and also
non-hydrocarbon gases, and certain litho-geochemistry
including He; which yields rather important
information on deep degassing and tectonic
activity. The analyses can include studying of
concentration levels, ratios of some components to
each other, differences from background values and
oher relations between various structures of
gases.
Geochemical researches are
carried out by many companies, and every company
has developed it’s own individual approach, which
is constantly under improvement. We sometimes
combine geochemistry with an analysis of
structural-tectonic elements of the areas (Ring
Geosystems)
We apply the newest technology of
geochemical searches of oil and gas using an
analysis of the geochemical components C7-C21,
desorbed from bottom deposits in marine areas
and/or from land surface deposits. The current
technology allows us to increase the efficiency of
hydrocarbon searches and also to forecast a phase
condition of deposits. In contrast to the
traditional search methods which use an analysis
of C1-C5 elements; in this technology the spectrum
of studied geochemical components is in a much
wider band up to C21.
We know that every oil and gas
field has it's own individual geochemical code
(marker, fingerprint), which can be identified in
a spectrum of C7-C21 components and this has a
residue in the sedimentary rocks, which cover
hydrocarbon deposits.
 If conditions exist to
carry out even small geochemical sampling and
researches at oil and gas fields, it allows us to
make precise forecasts of objects and also to
study the phase condition of hydrocarbon
deposits.
This technology greatly increases
the effectiveness of:
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The forecast of prospective
sections of large areas for the purpose of
identification of the first priority objects for
investigation;
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The search of oil and gas
deposits in difficult geological and
structural-tectonic conditions: cryogenic zones,
hydrochloric zones, tectonically shattered areas
etc.
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The forecast of phase condition
of hydrocarbon deposits at the exploration stage
of geological-prospecting works before drilling
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The mapping of the productive
contours of the oilfield at the exploration
stage of geological-prospecting works
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The analysis of the phase
structure of prospecting deposits and
identifying of their productive contours
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The oil and gas deposits search
both in deep-water conditions and shallow
transit zones.
It’s possible to decrease the
risk of mistaken decisions in planning and
carrying out of geological-prospecting works for
oil and gas search if using this method in
coordination with an analysis of geosystems
structures, exactly for allocation of first
priority areas and choosing of deep prospect
wells. |