一种厚度属性的构建及在砂体厚度预测中的应用

Construction of a thickness attribute and its application in thickness prediction of sand body

油田开发过程中,在预测砂体厚度时通常基于顶底反射时间厚度,时间厚度属性仅对厚层砂体预测较准确,对于厚度小于1/4波长的薄层砂体预测误差大。本文分析了楔状砂体模型属性曲线特征,提出了联合振幅、时间厚度及频率属性构造与砂体真厚度近似具有线性关系新属性的思路,从而给出了一种厚度预测新方法,克服了传统方法的不足。应用实践表明,新方法实现简单、适用性强,显著提升了薄储层的预测精度。

In oilfield development,the prediction of sand body thickness is usually based on the time thickness of the top and bottom reflection.The time thickness attribute is only accurate for the prediction of thick sand-body,and the prediction error is larger for thin sand-body thickness less than 1/4 wavelength.In this paper,the characteristics of the attribute curve of the wedge-shaped sand model are analyzed.A new method of thickness prediction is proposed with the idea of constructing an approximately linear relationship with the actual thickness of the sand body by combining the attributes of amplitude,time thickness,and frequency,which overcomes the shortcomings of traditional methods.The application practice shows that the new method is simple and applicable,significantly improving thin reservoirs'prediction accuracy.