Study On Structure Characteristics Of Carbonate Fracture-cave Unit In Tahe Oilfield

The Ordovician reservoir of Tahe oilfield is a special carbonate krastic fracture-cavereservoir．The krastic caves are the main accumulated space，the fractures are the mainflowing path．The fractures and the caves，s are anomalistic，the distribution is randomic．Inthis case，it is particularly important to identify fracture and cave，divide fracture-caveunit，fracture-cave unit structure．And it is also enhance the development of the Ordoviciancarbonate reservoir．According to the reservoir development characteristics of the6th area and the7tharea，the cave in accordance with the scale is divided into sink cave， river cave，tributaries cave，branch cave．And use core，logging，drilling data of the Ordovician torecognize fracture-cave in103wells．The cave is divided into sink cave，river cave，tributary cave and peripheral cave．Use of pressure， testing，production performance，the rate of change of amplitude and many other information division of the fracture-caveunit，divided into30fracture-cave unit．According to wave impedance inversion has established a good the method of studyon fracture-cavity unit structure，Study S80fracture-cave unit，T615fracture-cave unit，S66fracture-cave unit， S67fracture-cave unitof4fracture-cave units of structurecharacteristics， including structural features， fracture-cave characteristics， and thecombination of the fracture and the cave．...