DYNAMICS and ACTIVE PROCESSES - International Lithosphere ...

Upper Jurassic of the Ionian Zone contain poor to good quality type I/II source rocks for oil.
SOURCE�ROCK�MATURITY�
The outcrops Upper Triassic and Lower Jurassic source rock levels in the Ionian zone show
mature for oil generation (VR/E 0.53-0.88).
THERMAL�EVOLUTION�and�HYDROCARBONS�GENERATIONS�
Thermal evolution was made by 1D modeling with GENEX-GenTect software. These models
were calibrated using the organic matter maturity parameters (Tmax, vitrinite).
Fig.1: Model calibration.
The paleotemperatures measured in the fluid
inclusions were compared with the temperatures
calculated by the model. In this way, it has been
possible to determine the reservoir cementation time
period.
Fig.2: Evolution of the formations temperature with
time and the burial.
My results show that surface outcrops of Triassic-
Liassic dolomitic reservoirs never reached
temperature in excess to 80°C, thus accounting for
dominantly early diagenetic features. However,
potential reservoirs in deeper, still untested horizons
are likely to have reached temperatures in the range
of 120-140°C, and thus, are likely to display highly contrasted paragenetic assemblages,
involving the development of hydrothermal dissolution or high temperature dolomitic cements
(saddle dolomite), two processes known elsewhere to develop secondary porosity.
Fig.3: Total quantity of hydrocarbons generated
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