Geology Reference
In-Depth Information
hundreds of meters below OWC (Dunnington, 1961; Hunt,
1982; Joung, Monaghan and Schweisberger, 1977).
t
Jurassic and Cretaceous geochemical age (102-120 MMY)
of oils estimated from the ratio of the hydrocarbons in the
Asmari reservoir of the Hashmi-Hash, Marun and Agha-
Djari fields (reservoir age is 20 MMY) (Joung, Monaghan
and Schweisberger, 1977).
t
Dunnington's description based on the field data of the facts
of hydraulic communications between the Upper and Lower
Cretaceous sediments (Dunnington, 1961, 1967).
Falcon provided interesting information regarding the confirmation of
vertical fluid cross-flows' wide development in the region (discussion mate-
rials of the Dunnington, 1967, paper). A well in the Masjid-e-Suleiman
Field penetrated below the Asmari natural reservoir Jurassic and Lower
Cretaceous deep-water facies where the fracture formation as a result of
folding is unlikely. The well was plugged and abandoned but the cement
job was poorly done. The error created an artificial fracture that resulted
in pressure within a huge Asmari reservoir increasing at a rate of 0.07 MPa
per month. This, in the authors' view, indicates rapid transfer of a large gas
volume from deep high-pressure zones to the closer-to-the-surface low-
pressure zone. This occasion is a direct and convincing argument in favor
of the secondary hydrocarbon saturation in the richest Asmari accumula-
tions of the Southwestern Iran (Hunt, 1982).
5.3
Geobaric Parameters of Natural Fluid Migration
Some scientists forward the view that the geo-fluid-dynamic systems in
Alpine mobile belt regions have mostly elision nature (Ali-Sade, Putkaradze
and Salayev, 1968; Bars
et al
., 1978; Kapchenko, 1983; Kartsev, 1978; Kolody,
1969). Preceding sections have shown that the litho-tectonic environment
of these regions includes the step-block structure, sequential pinch-out of
individual stratigraphic units up the regional dip and in general their sig-
nificant shale-out in the deeper areas. These circumstances block ground
water migration from the central parts to the peripheral framework of the
depressions and troughs thus causing serious doubts in legitimacy of this
concept in its traditional form, which assumes more or less unobstructed
lateral water-exchange.
With respect to AHFP, the study of ground water dynamics, correc-
tion of the existing concepts and establishment of the objective nature in
