Geochemical analysis &petrophysical studies: An approach to clay minerals investigation of E member of Qom Formation, Sarajeh gas field

Geochemical and petrophysical studies on E member of Sarajeh Gas field shows presence of different type of clay minerals. Petrography studies along with XRD، SEM and EDX analysis on the present samples، indicate presence of Illite، Chlorite and expandable clay minerals. Expandable clays comprise، smectite and mixed layer or interstratified Illite/Smectite (I/S) minerals. Petrophsical studies show Th/K on NGS log in Sarajeh، well 12، composed mainly، Illite، chlorite with minor amount of interstratified Illite/Smectite (I/S). Geochemical studies confirm validity of petrophysical results. The presence of different clay minerals of Qom formation in E member، Sarajeh Gas field، may have significant impact on petrophysical properties of reservoir، and hence affect reservoir productivity as well as cause problem during drilling operations.