Geology Reference
In-Depth Information
Conclusions
In the preceding chapters, we proved the dominating role of geo-fluid-
dynamic processes in hydrocarbon migration, formation of oil, gas and
condensate accumulations and fields, their preservation and dissipation.
Our study, based on the review of huge geoinformation data in ten differ-
ent and complex tectonotypes of the Alpine mobile belt basins, enabled us
to provide quantitative evaluation of their geologo-geophysical parameters
(hydro-geochemical, geobaric, geothermal, hydrodynamic, lithofacies and
hydrocarbon related). Our study also allowed estimating their variability
in the space/time continuum to identify the cause-and-effect interrelations
between functional variables, to determine the real possibility of improv-
ing forecast reliability for regional, zonal and local oil and gas occurrences
and to develop a set of qualitative indicators and quantitative parameters of
hydrocarbon saturation under various geologic environments.
Following are the main conclusions of our study:
1. Alpine fold belts' intermontane depressions and foredeep
troughs are complex step-block structures. Individual
blocks sequentially subside from the periphery to the
centroclines. Different stratigraphic units and lithologi-
cal varieties contact over the block-separating faults. The
depressions and troughs are filled up mostly with clayey
facies (up to 90-95%). The sections are lithologically vari-
able and discontinuous laterally and vertically. Reservoirs
are often lens-shaped, their facies and reservoirs are incon-
sistent. The reservoirs pinch-out up the regional dip of
individual stratigraphic components. Intense faulting, frac-
turing, diapirism and mud volcanism are common.
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