Evaluation of fracturing effect of horizontal wells in coal shale gas based on borehole micro-seismic rapid location monitoring technology——take well J1HF in South North China as an example
In view of the long distance between the fracturing wells and the monitoring wells in the study area,the signal-to-noise ratio of the acquired micro-seismic data is low,it is difficult to pick up the first break of P and S waves,which directly affects the accuracy of microseismic location and evaluation of reservoir pressure.In order to solve this problem,this paper adopts the rapid location technology of micro-seismic events in J1 HF well,which is more flexible and low-cost,to identify and pick up the first break of micro-seismic events in J1 HF well,the micro-seismic signals of fracturing wells are collected by using the observation system composed of three-component geophone embedded in adjacent wells,and the micro-seismic signals are processed precisely,to achieve effective monitoring of rock fracture events.Based on the analysis of the space-time characteristics of the fracturing energy,the fracture geometry and propagation model are obtained.It is considered that the technology of"Temporary plugging ball+fiber temporary plugging agent"is more reasonable,it can effectively improve the complexity of fracture and obtain an ideal reservoir reconstruction volume.The research results have certain guidance and reference function for coal-bearing shale gas fracturing reconstruction in South China and North China.
Microseismic in wellCoal shale gasFast search and location technologyReservior volumeEffect evaluation
万方数据
维普
