Application of the weakness ratio in fracture medium fluid detection
弱度比在裂隙含流体检测中的应用

Fluid detection in fracture medium has great significance for the oil gas prospecting and exploitation.The weakness ratio of fractures in relevant with the fluid in fractures and it is very sensitive to the velocity ratio.Through analyzing the relationship between weakness ratio and velocity ratio,this paper offered the expressions between the converted-wave velocity ratio or time ratio and weakness ratio,then an example were given in WJT gas field,Daqing oil field in China.The result indicates that it is possible to detect fluid property in fractures by using the weakness ratio,and the weakness ratio section can be applied in fractured oil and gas detecting.