Study On Microseismic Phase Recognition And Its Visualization Technology

Micro-earthquakes are usually caused by changes in underground stress fields c aused by hydraulic fracturing or conventional water injection,gas injection and othe r engineering operations.Micro-seismic monitoring technology is to use visualization technology to image fracturing fractures of the collected micro-seismic signals,eval uate the fracturing effect,guide the next step of engineering operations,and provide a basis for unconventional oil and gas production.The study of the principles of microseismic monitoring technology and the improvement and innovation of technolo gy can greatly improve the oil and gas recovery rate and production.Based on the microseismic monitoring process,this paper focuses on two aspects that affect microseismic monitoring: seismic phase identification and data visualization.First,it introduces the development status and application research of related technologies and software at home and abroad.And on this basis,complete the design and implementation of the improvement of microseismic signal phase recognition method and the visualization of microseismic data.The main research work is completed:(1)Aiming at the problem of time-consuming picking of a large number of microseismic signals and low picking accuracy during filed operations,a joint adaptive microseismic data picking method based on wavelet modulus maxima and STA / LTA algorithm was developed.The improved algorithm was verified with forward modeling data and field measurement data.The picking results show that the algorithm can shorten the processing time of microseismic signals,and the picking error is controlled between0.25 ~ 0.5ms.(2)Through the analysis of several commonly used source positioning algorithms,combined with previous research results,the forward effect test was used to test the positioning effect.It was concluded that in addition to the positioning algorithm affecting the positioning effect,the accuracy of seismic phase recognition is also the main factor affecting the source positioning accuracy.It further demonstrates the importance of improving the seismic phase recognition algorithm in this paper.At the same time,the realization of the visualization of microseismic data is also inseparable from the precise source location,and provides a variety of positioning algorithm choices in the software design and implementation.(3)According to the needs of micro-seismic data display,design a visualization system for micro-seismic data with interoperability.The system design is mainly based on data management module,interactive interface module and data interpretation module.The data interpretation module implements specific graphics drawing.The display list provided by OpenGL realizes the drawing of primitives,and at the same time combines the needs of micro-seismic data interpretation to realize human-computer interaction,forming a visual display system for micro-seismic data in hydraulic fracturing projects.(4)The improved seismic phase recognition method is displayed on the visual interface,and the most suitable algorithm can be selected among several commonly used positioning algorithms for seismic source positioning,and the monitoring well information and seismic source positioning results are transmitted to the data interpretation module.The three-dimensional visualization effect further verifies the feasibility and reliability of the research results in this subject.