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目前,利用地震反演预测孔隙度,进而获得储层的横向品质的变化规律是常用的方法和手段,但其应用仍有许多局限性,不可盲目使用。本文以挪威Halten Terrace地区的Lavrans油田为例,论述了反演的适用条件及声阻抗反演的基本特点;在实验室对本区的岩心进行了多种试验,以分析孔隙度、压力和流体类型对地震速度的影响,得出岩石孔隙度比地层压力和地层中的流体对地震速度影响要明显得多的结论。并根据统计分析技术拟合声阻抗转换孔隙度公式,进而得出伪孔隙度平面图,还通过对声阻抗全三维数据体进行可视化分析,获得本区特定储层品质的横向变化,以指导钻探。由于地层产状会影响地震振幅,因而也会影响声阻抗反演的效果。因此,在构造陡倾或复杂地区,要慎重使用地震反演,应综合考虑资料品质对反演结果的影响,只有这样才能使反演的结果更加可信和真实。
At present, it is a common method and means to predict the porosity by seismic inversion and obtain the variation rule of reservoir lateral quality. However, its application still has many limitations and can not be used blindly. Taking the Lavrans field in Halten Terrace, Norway as an example, this paper discusses the applicable conditions of inversion and the basic characteristics of acoustic impedance inversion. In the laboratory, various tests were conducted on cores in this area to analyze the porosity, pressure and fluid type It is concluded that the influence of rock porosity on the seismic velocity is much more pronounced than that of the formation pressure and the fluid in the formation on the seismic velocity. And fitting the acoustic impedance conversion porosity formula according to the statistical analysis technology to obtain the pseudo porosity porosimetry map. Through the visual analysis of the all-dimensional acoustic impedance body, the horizontal variation of the reservoir-specific quality in this area can be obtained to guide the drilling. As the formation of the formation will affect the amplitude of the earthquake, it will also affect the acoustic impedance inversion effect. Therefore, in the construction of steep or complex areas, we should carefully use the seismic inversion, which should consider the impact of data quality on the inversion results. Only in this way can the results of the inversion be more credible and true.