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Reservoir Control and 
Oil
Geochemistry
By
Enver Ablia1, Elena Slivko1
(1) Geology faculty of Moscow State University, Moscow, Russia
Doesn’t doubt the power of geochemical information. This data mainly use for
genetic conclusions. However, geochemical application for exploration and
special for production is still limited. We believe the oil is complex
hydrocarbon solution, making interconnected system with rock matrix and
contacting water solutions. Oil samples from some West Siberian lithologically
screened accumulation fields have been analysed. The ash value flow, capacitor
properties and types of cement is observed. Different zones are focused in
parallel lines reservoirs pinchout line. In change of structure oils the
following is revealed based on bulk data and individual hydrocarbons (HC)
distribution. The most appreciable changes are observed in distribution of
gasoline HC’s and some other HC’s. The gradient of change on kilometre to the
screen (G) was calculated. To clay screen the ratio alkanes/iso-alkanes (G -
0.09) and alkanes/ Cycloalkanes (G - 0.17) decreases. These gradients are well
correlated with zones of identical reservoirs distribution. Hexane/iso-hexane
quickly varies at the screen (up to 5 km) and further becomes gently sloping.
Uniform reduction of benzene concentration is observed to the screen (G - 0.05).
The basic features of oil composition change are connected with natural
chromatography by effect of reservoir diverse. Various HC’s are subject to
various influence of sorption forces on phases border of the rock-fluid. Thus
fluids too are not homogeneous at contact with water, each HC thus are dissolved
differently. The received results testify that the data of oil composition can
be use for of reservoir distribution and optimisation of exploration processes.
