Abstract：Carbonate reservoirs in Tarim Basin are fracture,fracture-cave,and cave reservoirs characterized by strong spatial heterogeneity.So carbonate cave spatial positioning has large errors due to seismic poor imaging and low resolution.In order to have an accurate target positioning in the front of drilling bit in carbonate rock areas,we propose a karst-cave positioning approach at wells based on VSP data,which can provide drilling target coordinates and improve the drilling rate of carbonate reservoirs.There is two ways to do this:one is karst-cave positioning based on the joint use of zero-VSP and surface seismic data,and the other one is based on only walkaround-VSP data.The proposed approach now is widely applied in Tarim Basin,and has achieved quite good results,which provides a new idea for the second development in old carbonate-reservoir oilfields.
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