时移地震波阻抗反演方法研究

地震波阻抗反演是进行地层层间属性定量解释的重要工具，由于噪声的存在，波阻抗反演有很强的多解性，对时移地震而言，当参考地震资料和监测地震资料的差异很小时，多解性将使得时移地震反演失败，在时移地震反演中，油藏的变化能被限定在特定的层中，而在非油藏部分，参考波阻抗模型和监测波阻抗模型应该是相同的。利用参考波阻抗模型与监测波阻抗模型之间的关系，并把参考地震数据与监测地震数据的差异作为附加地震约束，对参考地震数据和监测地震数据进行同时反演，这一方案能有效地降低时移地震反演的非唯一性，得到精度更高的波阻抗反演剖面，同时减少了计算量。

The method for impedance inversion of time-lapse seismic data

Impedance inversion is a necessary tool when it comes to quantitative interpretation of seismic data in terms of interbedded properties. But the inversion suffers from a strong non uniqueness of the solution. If the expected seismic variations are small, non uniqueness will lead to failure of time lapse seismic inversion. In case of time lapse seismic inversion, the expected reservoir variations are confined in certain area of the reservoir, leaving other areas keeping unchanged. A proper objective function and flow for the inversion of time lapse seismic data was established by analyzing the relations between the seismic data and impedance models. The method can effectively decrease the non uniqueness of the impedance solution in less computation cost.