Abstract: The discovery of Tahe oilfield first benifits from the application of the 3-D seismic exploration techno logy.In the course of further evaluation and rolling exploration and development and aimed at the heterogeneity of the Paleozoic karst type carbonate rock reservoirs,3-D seismic data and various geophysical methods are used to make reservoir prediction and study the distribution and hydrocarbon prospects of reservoirs.While the negative-pressure drilling technology when applied to shafts can guarantee normal drilling operation and raise working efficiency,it reduces the pollution of reservoirs to a minimum and ensures to discover hydrocarbon reservoirs withous delay.The imaging logging technology can be used to study the development of pores,caves and fissures in carbonate rocks,the lateral extension and connection of permeable layers and the types of formation fluid;furthermore,the lithology of strata and the parameters for physical properties and petroliferous features can be calculated quantitatively by combining various logging data.The successful application of the fracturing acidization technique effectively removes man made injuries to reservoirs.And by artificial fracturing acid corroded new fissures,it connects natural pores,caves and fissures,raises diversion capacity,regains productive ability and libe rates oil reservoirs.Besides,the use of related technologies of these major ones plays an effective guarantee role in the exploration evaluation of Tahe oilfield.