Geology Reference
In-Depth Information
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Relatively weak and sporadic development of granular (the
Khinalug, Atashkya, Kyullyully and Kemishdag sandstones)
and fractured (Valanginian-Hauterivian) reservoirs.
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Their poor permeability and strong lateral lithofacies vari-
ability resulting in their shale-out in the southern and south-
eastern directions.
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Rare exposure of the reservoirs, etc.
These specifics cause hydrodynamic isolation of the equivalent intervals
in the adjacent tectonic steps and reservoirs within their limits from the
meteoric infiltration (Durmishyan, Muradian and Rachinsky, 1973).
Based on the conducted studies (Akhundov, Mekhtiyev and Rachinsky,
1976; Durmishyan, Muradian and Rachinsky, 1973), the exposed Mesozoic
zone over the plunge of the Caucasus Major Meganticlinorium appears to
be not the external charge area of the infiltration system but one of the
ground water discharge areas. It is supported by:
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Intense erosion, river network and numerous ascension
springs within each step produced by deep origin thermal
water (Kashkay, 1952).
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Ground water rates on the order of 5-20,000 CMD in wells
located near the fault zones (Kesh and Begimdag-Tegchay
prospects).
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AHFP creating the excess head at the wellheads (over 15-20
MPa) not supported by the elevation of exposed areas of the
tested intervals.
Additional factors contradicting the infiltration water penetration from
the said area into the Apsheron and Kobystan areas are:
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Quite restricted exposure area of Mesozoic reservoirŠ¾s.
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Their small thickness in the exposure areas.
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Deficiency of the natural precipitation in the supposed
charge zone that excludes the generation of needed infiltra-
tion water amounts.
These factors indicate that within the southeastern plunge of the Caucasus
Major Meganticlinorium and south and southeast of it (the Apsheron area
and Kobystan) the water flow of artesian type in the Mesozoic is unlikely.
Similar objections against functioning of an infiltration system over the
