Pre-stack Simultaneous Elastic Inversion Of P-and S-wave

Due to the increasing demand for oil,deepen and structural trap exploration degree is insufficient,invisible reservoir exploration is becoming more and more important. Therefore,the ability to improve oil and gas exploration and development has a very important significance.Pre-stack simultaneous elastic inversion of P-and S-wave,starts from prestack data with rich geological information,obtains formation p and s wave velocity,density and other parameters from pre-stack gathers,and then use the angle gather data from different angles to give elastic wave impedance data,it will provide a new method for studying the reservoir variability.First,this paper briefly describes the basic principles and classification of seismic inversion for recursive inversion,geostatistical inversion,logging constrained inersion and AVO inversion,process the basic advantages and disadvantages,then describes basic idea dan advantages of the pre-stack simultaneous elastic inversion of p-and s-wave.It provides a solid theoretical foundation for subsequent applied research.Then,on the basis of the theory,to the actual work area for inversion,the target layer of the research work area is shahezi subgroups.The first is the pre-treatment logs,divided into the following steps:logging data analysis,caliper collapse environment correction,histogram complete logs regional standardization,cluster analysis method to achieve shear curve reconstruction,reservoirs parameter sensitivity analysis.During the process of sensitivity analysis of reservoir parameters,first analysis the elastic parameters and conventional logging of the four sequence,preferably the more sensitive parameters,then five sequence for more detailed analysis of the layered segment intersection. Through this process, the reservoir can be more detailed description. Followed by pre-stack elastic inversion technology research can be divided into: pre-stack data portion overlay, fine well-seismic calibration, the elastic properties of a variety of information constraints, soft trend constraints, stacked several steps elastic inversion effect analysis, prestack key part elastic inversion of elastic parameters for a variety of body strike,then we will obtain lithologic interpretation and single sand body characterization.In the process of determination of single sand body, use the "dessert" property of reservoir, which can identify check prestack elastic properties of vertical and horizontal wave velocity ratio, portrays the five procedures of single sand body, by the method body perspective, we find the larger single sand body. By the aspect ratio of the velocity profile analysis, determine the suggestion of horizontal well.