The Cambrian dolomites in the Tahe region have genetic features of transitional diagenetic environment.After a short-time early diagenetic period(sea-bed diagenesis and meteoric water diagenesis)

the Camb-rian carbonate deposits went into burial diagenetic period

going through a diagenetic process from penecomtemporaneous dolomite to early diagenetic and shallow burial dolomite

to late diagenetic and deep burial dolomite

and finally to hydrothermal dolomite.Fractures and dissolved vugs(caves)are the main types of reservoir space of various Cambrian dolomites in the Tahe region.The major mechanism of the development of reservoir space of the Cambrian dolomites in the Tahe region is dissolution related to hydrothermal fluid flow through deep faults under deep-burial dolomitization background.And the main controlling factors responsible for the preservation of reservoir space are the intensity of filling and cementation in various periods

stable burial process after hydrothermal dissolution and relatively minor tectonic events.