Geology Reference
In-Depth Information
The possibility of the elision waterhead system functioning in the region
is also not supported. Any broad development in the region of elision pro-
cesses, especially in deep intervals of the section, is rejected based on the
following:
t
The step-block structure of the trough. It is defined by a system of
regional lengthwise (Tersk-Caspian, Middle-Tersk, Argudan-
Sunzha and Chernogor), crosswise (Cherkes, Malkin, Baksan,
Chegem, Ardon, Kazbek and Argun) and diagonal (Nalchik,
Datykh-Akhlov, Benoy-Eldarov, Gudermes-Mozdok and
Samur) deep-seated faults. They bring into contact heteroch-
ronous and facially different intervals of the section.
t
The absence in the penetrated Mesozoic section of under-
compacted, with elevated water-saturation clay sequences,
which are the energy and mass source of the squeezed-out
water flow.
t
Low compactability of clastic and carbonate reservoirs.
t
No large-scale present-day subsidence of the central basin
compensated by the deposition.
t
The effect of a progressive increase in the horizontal hydrau-
lic resistance with increasing charge area; this deflects the
lateral migration and transforms it to the vertical direction.
t
The commonality of hydrochemical (Chapter 2), isotopic
(Volobuyev, 1986), geothermal (Sergiyenko, 1971), piezo-
metric (Chapter 3), palynologycal and other distortions of
the regional background.
t
Fracturing of the Mesozoic carbonate reservoirs only within
local highs and its practical absence in the inter-structural
zones (Burshtar, 1973; Kortsenshtein, Kiryashkin and Filin,
1970).
t
Generally lens-shaped nature of clastic reservoirs and their
facies change into impermeable varieties toward the trough's
flank zones and from the crests to the flanks and plunges of
individual anticlines.
t
Reaching maximum compaction by the Jurassic and Lower
Cretaceous clay sequences at the time of final setting of
the Tersk-Caspian Trough in Ponthian (15 MMY ago) and
the absence afterwards and up until now of any substantial
porosity decline (Burshtar, 1963, 1973) accompanied by the
squeeze-out of plentiful depositional water.
