The Study On Microseismic Forward Modeling

Micro-seismic monitoring, as a technology which can be used for the study of the process of internal micro-fracture of stratum, has a significant range of applications in the reservoir exploration and development of oil and gas. Micro-seismic forward data simulated, which is saw as an important part of micro-seismic monitoring, plays a significant role in the development of Micro-seismic monitoring.Micro-seismic forward data simulation includes two means. The one is wave equation method and the other one is ray tracing. Both of them have their own advantage. This paper mainly focuses on micro-seismic forward data simulation which is based on ray tracing method. Ray trace is widely used in positioning the source location and seismic tomography imaging. Based on the principle of ray tracing, this paper mainly study three-dimensional piecewise iteration method ray tracing and bilinear interpolation algorithm ray tracing. At the same time, it is implemented in three-dimensional horizontal and inclined layered media. Thesis analyzes and discusses the accuracy, speed and application range of piecewise iterative ray tracing and bilinear interpolation ray tracing.In order to improve the speed of bilinear interpolation, some measures are taken. On the one hand, thesis takes measures to improve the algorithm of bilinear interpolation to reduce the search number during calculating the minimum traveling time, thereby enhancing the speed. On the other hand, in the case of multi-source, according to the characteristics of bilinear interpolation algorithm, thesis takes full advantage of the exchange principle between source and receiver to improve its speed, through reducing the number of computing grid.Thesis studies the automatic generating of the excitation time and source location of micro-seismic events which vary with time and space. Paper takes full advantage of ray tracing to trace the information of travelling time, inclination and azimuth. Finally we successfully produce three-dimensional three-component micro-seismic synthetic seismograms.