The Application Research Of Joint Location Method With Micro-seismic And Surface Seismic Data

Microseismic monitoring technology is a new geophysical technique,which can be used to evaluate the fracturing effect and guide the optimization of fracturing process by monitoring the micro-seismic wave that generated by the fracturing of the tight reservoir.Micro-seismic monitoring technology is one of the most effective methods in the monitoring and evaluation of hydraulic fracturing,which can monitor the formation,orientation,length and height of fractures in real time.Micro-seismic monitoring technology has achieved great development and wide application,but it also faces challenges.The problems of improving the location precision of micro-seismic events,playing the role of fracturing effect evaluation,process optimization and well placement are eager to solve for micro-seismic monitoring technology.The location accuracy of micro-seismic events is mainly influenced by the SNR of micro-seismic data,velocity model and location methods.In this paper,we carried out noise suppression technology of micro-seismic data,joint correction and location method based on 3D seismic and surface micro-seismic data,micro-seismic energy two-way cumulative crack imaging technology and multi-data joint location results comprehensive interpretation technology.In order to overcome the adverse effects of complex near-surface,to improve the accuracy of micro-seismic event location,and to expand the application scope of ground micro-seismic monitoring technology,the role of 3D seismic,geological and logging data in mature oil area are fully used.The SNR of micro-seismic data is limited to the pickup and location accuracy of micro-seismic events.According to the characteristics of noise,noise suppression system is formed.The time-frequency domain noise suppression technique based on the modified S transform is studied,and the noise interference is suppressed in the two-dimensional time-frequency domain.The independent component blind source separation noise suppression technology is used to reduce the influence of random noise.The technology of automatic identification and matching of ground active noise is studied,which is useful to improve SNR of micro-seismic data.The joint correction and location method based on 3D seismic and surface micro-seismic data is studied.Based on the 3D seismic data and the low speed measurements data,a precise near-surface velocity model and a quality factor are established.Through near-surface compensation and static correction,the adverse effects of complex near-surface are eliminated.The 3D seismic velocity model is used to compensate the deficiency of the shallow layer of logging data.The residual static correction is obtained by cross-correlation.Using time-frequency analysis method,the energy spectral density of different frequency bands is calculated and the accurate pickup of micro-seismic event is realized.The accurate location of micro-seismic events is realized by gradually improving the quality of micro-seismic data and the accuracy of the velocity model.The monitoring data of surface micro-seismic data has the problem of weak signal energy and large pickup error.This paper studies the micro-seismic energy two-way cumulative crack imaging technology based on energy balance factor,and the energy difference between different windows is eliminated.This technique can reduce the adverse effects of strong energy noise interference and realize the accurate loction of the weak energy micro-seismic events.The location results of micro-seismic events are multi-resolution.This paper deals with the interpretation techniques of micro-seismic and 3D seismic,logging and engineering fracturing informations.Through the comprehensive interpretation and application of multi-data,the multi-solution of fracture interpretation is reduced.It can better evaluate the fracturing effect,play the guiding role of tight reservoir fracturing,and finally achieve the goal of improving oil and gas recovery.The location accuracy of micro-seismic event is directly affected by the data SNR,velocity model accuracy and location method.We carried out noise suppression technology,joint correction and location method,microseismic crack imaging technology and location results comprehensive interpretation technology.The methods have achieved good effects in practical application.Finally,the purpose of efficient development of tight oil and gas reservoir is realized.