The Application Of Research Time-lapse Seismic Technology In The Development Block Of Oil Field

Time-lapse seismic--one of the hydrocarbon dynamic detection and evaluation methods--came into being in the middle 1970s and got rapid development in the 1990s.By this advanced method,we use the divergence and variety between the kinematic and dynamic data of the seismic wavefeild meatured in different time to research the hydrocarbon variation.In most cases, time-lapse seismic is taken by repeated 3D seismics,so it is also called 4D seismics.There are many other time-lapse observation methods besides the 3D time lapse seismic such as time lapse 2D seismics,time-lapse cross hole seismic,time-lapse VSP etc. Apparently, in order to achieve the hydrocarbon dynamic detection and fast evaluation as well as to reach the goals of adjusting the exploitation plan and raising the reservoir output coefficient,it is very necessary to use time-lapse seismic method and to take synthetical analysis by using petrophysical data,geologicaldata and reservoir exploitation dynamic state. The thesis expounds the theoretical bases and techniques of the time-lapse seismic,including time-lapse data normalization process,seismic reservoir parameters inversion,seismic attribution parametric extraction and optimization, time-lapse attribution analysis and reservoir predication methods.On this base,getting the practical 4D seismic data,the VSP well data,the well drilling geology data and exploition dynamic documents of LMD oil field development area,firstly,the thesis analyzes and researches the adaptiveness of the inversion methods and the sensibility of seismic attribution parameters in this development region and then the variable characters of the inversion reservoir and the time-lapse attribution parameters are analyzed and inquired.These behaviors lay a foundation for pre-determining the reservoir residual oil according to the time-lapse information in the development area.The applied survey shows that in the development area,on the base of the 4D seismic data normalization process and delicate horizon calibration and tracking,inverting reservoir parameters and many kind of seismic attribution parameters including time-lapse parameters by probabilistic simulation method while predicting the total distribution of the fluid in the reservoir by artificial neural network method.All of these can be improved by the preferable practical application effects. It indicates sufficiently that the 4D seismic method has a good feasibility on the reservoir residual oil detection and monitoring during the period of oilfield development.