The Research And Application Of Micro-seismic Fracturing Monitoring Technology

Micro-seismic fracture monitoring technology is an important new technology in the filed of low-permeability reservoir fracturing transformation in recent years. The technology is to monitor micro-seismic wave during fracturing by the detector of adjacent well, and describe the geometry shape, spatial distribution characteristic and fissure growth process of hydraulic fracturing. Micro-seismic fracture monitoring technology is a branch of developing seismic. The seismic wave being used is not generated from Special artificial source, but from rock breaking. Under ground stress field changes caused by oil-gas production, water injection, gas injection, thermal drive or hydraulic fracturing will cause this condition. Recording, processing and interpretation of the information can monitor the front movement of pore fluid during the oil-gas field development, produce space image of hydraulic fracturing and space range of heating zone when thermal drive, make an analysis of underground stress field, to determine the oil well casing damage danger zone, prolong the life of well. Eventually improve recovery efficiency, reduce the cost of oil and gas field development.This paper is based on the principle of micro-seismic fracture monitoring technology, combined with micro-seismic generation mechanism and wave-pattern theory, to do the research of micro-seismic fracture monitoring method. According to the information of geology, logging and oil reservoir, design the method of micro-seismic fracture field monitoring, determine the optimal observation way, complete the formation model establishment after the comparison of conventional seismic structure interpretation, logging interpretation and inter-well stratigraphic correlation. On the base of the study about micro-seismic wave spectrum analysis and de-noising, first break picking accurately of micro-seismic P wave and S wave method and waveform analysis, identification of guided wave, the method of micro-seismic data processing being completed. Choose the improved vertical and horizontal wave time difference method to position, the research of micro-seismic position method being completed. The results show that micro-seismic fracture monitoring technology provides an important reference for oilfield development.According to the research project, we have done a lot of research on the part of hydraulic fracturing micro-seismic data acquisition, data processing, forward and inversion, these results as follows:(1) Through the research of domestic and international literature, material of sci-tech novelty, the home and abroad fracturing construction methods, data acquisition, processing and inversion process being understood and mastered, gives a specific research direction for our current and future research.(2) Micro-seismic fracture monitoring data acquisition achieves great benefit. On the base of micro-seismic fracture monitoring data acquisition and construction method, the design technology of micro-seismic fracture monitoring data acquisition being studied, optimize the observation system, form a observation method to guide field production. In addition, in view of the existing micro-seismic fracture monitoring basic data and other regional stimulation well micro-seismic fracture monitoring data, conclude and summarize the micro-seismic fracture monitoring collection technology and methods, improve the fracturing construction data acquisition process.(3) Do the research of micro-seismic fracture monitoring technology method, form a corresponding system. From the data acquisition, data processing to inversion positioning, etc., By comparison of much theoretical model and the actual data, laid a solid foundation for optimization and screening effective data processing method, the establishment of concise and effective geological model and forming accurate inversion positioning method.Through the study of this paper, micro-seismic fracture monitoring technology has obtained certain achievement during the application of certain oil-field. After a series of research, a set of micro-seismic fracture monitoring data acquisition, data processing and interpretation system be established, provides crack height, length and azimuth produced in the fracturing construction, make use of information to optimize fracturing design, optimization of well pattern or other oilfield development measures, so as to improve the recovery efficiency, provides new technology for reservoir dynamic monitoring and development.