Study of basaltic rocks in the Rastan region showed the presence of
many morphological and petrographic varieties compatible with
rocks of Alhesen castle region. Chemical analyses of studied rocks
proved to be alkaline rocks with sodic-potassic na
ture. Rotten parts
of studied rocks considered an important source of civilian
installations, paving roads, and as materials for manufacture of
cement, in addition to their academic importance in Petrological,
paleogeographic, and tectonic studies.
Shiranish formation in Sazaba Oil fields region had been divided by
Petrology study and well Logs measurements to three major members (lower –
middle – upper). Then these members have been divided to lithostratigraphic
units and subunits. This stu
dy showed that the lower member is formed of
clayey - limestone rocks rich in planktonic foraminifera and glaconitic sand.
The middle member consists of organic limestone facies, dolomitic-limestone,
sometimes clayey - limestone rocks with crystals of pyrite and glaconitic sand.
Organic- limestone rocks and detrital limestone are predominant in the upper
member interbeded by dolomitic-limestone and rare clayey – limestone. This
facies contains pelagic and planktonic foraminifera.
The role of diagenes phenomenon is evident on Shiranish’s facies through:
dolomitization according to burial and miksing processes. It is also clear
through chemical compaction, mechanical compaction, cemenation,
micretisation and silisification.
