Study On Inversion Method Of Microseismic Monitoring Fracture

During the development of oil and gas field,hydraulic fracturing is an important stimulation measure.Fracture shape and fracture scale produced by hydraulic fracturing is an important factor that affects the success of fracturing treatment and the result of stimulation in block.Compared with the conventional hydraulic fracture monitoring technology(well deviation measurement monitoring technology,temperature measurement monitoring technology,measurement of radioactivity monitoring technology,potentiometric method for monitoring technology),microseismic monitoring technology can detect the length,height and azimuth angle of fracture and other fracture shape parameter,and this method has the characteristics of economy,simplicity of implementation,so the microseismic monitoring technology become a new technology which is developing rapidly in recent years.In the previous research,the microseismic location are not related to the difference of microseismic wave propagation velocity in deep,multi-layers formation,which limited the application of microseismic monitoring in deep,multi-layers formation.This paper will focus on this problem,This paper surveyed the development of microseismic monitoring technology in recent years,and introduces the basic principle of microseismic monitoring in fracturing,including acoustic emission,Mohr-Kulun theory,fracture mechanics criterion;According to the multi-layers conditions,this paper established the mathematical model of microseismic wave propagation in multi layers to determine the source,solved the model with the iterative method;Then programmed microseismic interpretation software with computer programming language(VB.net & Matlab),showed the results in two,three-dimensional,and carried on the simulation of three dimensional shape of fractures;With the research findings,this paper study the effect law of microseismic interpretation of different speed and different stratification schemes,Combined with examples,This paper computed and analysed the microseismic monitoring data of differernt wells(multilayer vertical well,horizontal well fracturing,water flooding front of injection well),the interpretation result got a very good consistency with the design result,which proved the reliablity of this model,and provides some reference to improve the site fracture design and process.