Hydrocarbon carrier system of carbonate rock and exploration direction in Tahe Oilfield, Tarim Basin

The hydrocarbon carrier system of carbonate rock in the Tahe Oil Field has been studied systematically according to regional geologic condition.The above-mentioned carrier system can be divided into three types: 1)fault structural fissure;2)unconformity and paleo-weathering crust;3)Ordovician karst pore,fracture and vug.Fault and its concomitant structural fissure as well as karst fracture network resulted from severe karstification effect work as hydrocarbon carrier system in the central Tarim Oil Field.Fault and its concomitant structural fissure as well as unconformity dipping to the south chronically work as hydrocarbon carrier system in the peripheral region of the oil field.According to the features of hydrocarbon carrier elements and their spatial arrangement,three favorable exploration targets have been pointed out: 1)fracture-karst type reserves in the north of block no.3 of the Tahe Oil Field;2)stratigraphic unconformity-karst type reserves in the central Tahe Oil Field;3)lower Ordovician karst-fracture type reservoirs in the southern Tahe Oil Field.