多道相关反演算法在储层预测中的应用

Multi-channel Correlation Inversion Algorithm in Reservoir Prediction

叠后反演是基于地震资料储层预测的核心技术之一,基于模型的地震波阻抗反演中除反演的数学方法之外,如何处理地震资料分辨率与地质模型可信度之间的关系成为影响波阻抗反演实际效果的关键因素。为此,研究多道相关波阻抗反演算法的精度及影响因素,主要包括体现横向相关性的基于地震数据中信噪比和不确定方差的参数的改变,体现纵向相关性的地质小层数目的确定等,并且从这2方面分析叠后反演结果的精度和提高反演效果参数的选取方法,验证多道相关反演算法的可行性,并将这种方法运用到我国西部某盆地实际资料的储层预测中,取得了良好的效果。

Post - stack inversion is one of the core of the reservoir prediction. Based on the model of seismic imped- ance inversion, how to deal with the relationship between the resolution and the credibility of the geological model of the seismic data has become a key factor to affect the actual effect of impedance inversion besides mathematical methods. Therefore, studying the muhi -channel correlation impedance inversion algorithm＇s accuracy and its influ- encing factors, includes reflecting the transverse correlation based on changing the parameters that signal to noise ratio and uncertain variance, and reflecting the vertical correlation based on determining the number of geological layers. It also analyzes the accuracy of Post - stack inversion＇ resuhs and tile parameter selection methods which improve the inversion effect from these two aspects, and illustrates the feasibility of muhi - channel inversion algo- rithm. This method applies to reservoir prediction of the actual data in a basin of western China and achieved good results.