Present-Day Geo-Fluid-Dynamics of Alpine Mobile Belt Basins - Fluid Dynamics of Oil and Gas Reservoirs - page 288

Hydrodynamic calculation techniques for the determination of
ground water movement in deep horizons are imperfect. The imperfec-
tion relates to:

t Tentativeness in the selection of a reference plain character-
ized by constancy of specific gravity.
t Errors in water's specific gravity determination at the level
measuring point.
t Impossibility of the integral consideration of the tempera-
ture, pressure and dissolved gas content's effect on liquid's
specific gravity under reservoir conditions.
t Assumed unidirectional specific gravity distribution in
space.
t Viscoplastic properties of ground water in clayey reservoirs.
t Postulated fluid flow through the entire reservoir thickness
with no consideration of the vertical waterhead decline.
t Impossibility to evaluate actual permeability of water-
saturated intervals and its vertical and lateral variations.
t Lithofacies variability of reservoirs and structure-tectonic
features of particular sheet reservoirs that cause the refrac-
tion of filtration flow.
t Incompatibility of the Darcy model established for a case of
laminar flow of a uniform liquid through a rigid unchanging
porous medium with targets of deep hydrogeology, etc.

Consideration of these factors determines the preferred role of geologic
techniques in deciphering of the geo-fluid-dynamic situation in the sedi-
mentary section, which is the subject of this section.

5.2.1 Intermontane Depressions

5.2.1.1 The South Caspian Depression

There were no specific studies of hydrodynamic environment in the
Mesozoic intervals. There were, however, some views on the subject.
Ignatovich made conclusions about the exposed Mesozoic area over the
southeastern plunge of the Caucasus Major Meganticlinorium as the
external charge area of the Pliocene deposits in the Apsheron area by sur-
face waters. He suggested a typical artesian - infiltration regime there.
Sukharev (1979), Ismaylov (1974, 1986) and Agalarov (1960) held similar
views. Identical ideas for the east flank of the depression were developed