Geology Reference
In-Depth Information
Figure 8.5
South Caspian Depression. Oil-saturation in accumulations and primary
alkalinity factors of their ground water vs. per-unit faulting of local structures. See Figure 7.2
for legend.
that migration from the source rock zones in the underlying sediments was
dominant.
The significance of the latter factor, together with all previously men-
tioned, is underscored by Figure 8.5. It shows the correlation between
ground water primary alkalinity factors on contact with oil aggregations in
the basal formations of the Productive Sequence in the Apsheron area (the
attribute of a fraction of the foreign alkaline component in the composi-
tion of formation waters), their per-unit faulting and oil-saturation
(
β
i
3
).
Figure 8.5 shows that in all fields the ground water
alkalinity and
per-
unit volume oil-saturation in the accumulations consistently increase
together with the per-unit volume
faulting. It defines thereby the domi-
nant role of vertical hydraulic communication between the Productive
Sequence and the underlying intervals both in the formation of the chemi-
cal composition of its saturating ground water and in the conditions for its
inter-formational cross-flows and indirectly (see above) in the hydrocar-
bon accumulation.
The data for other Alpine mobile belt regions show qualitatively similar
situation both for the intermontane depressions and for foredeep troughs
(Tables 8.2, 8.3; Figure 8.6). This suggests that the vertical fluid transfer
mechanism dominates in those basins as well.
Statistical processing of the quoted information massif (Tables 8.1-8.3)
using group argument counting technique found pair analytical correlations
between the hydrocarbon reserves density and local structures' faulting
parameters and water medium dynamics (Tables 8.4-8.8). High correlation
