一种利用弹性阻抗方程直接反演低渗"甜点"的方法

低渗储层中的“甜点”是低渗油气勘探开发中非常重要的地质目标，研究低渗储层的“甜点”预测和识别方法具有重要意义。本文首先从低渗“甜点”的定义出发，确定“甜点”的敏感弹性参数；在此基础上，利用敏感参数弹性阻抗方程进行弹性阻抗反演及“甜点”敏感参数提取，减小了间接预测“甜点”敏感弹性参数的累计误差，提高了“甜点”预测的精度。进一步与岩相流体概率（FFP）技术相结合，在目标区“甜点”预测中取得较好的效果。 

A Method for Directly Inverting Low Permeability "Sweet spot" by Using Elastic Impedance Equation

The "sweet spot" in low-permeability reservoirs is a very important geological target in the exploration and development of low-permeability oil and gas.It is of great significance to study the "sweet spot" prediction and identification methods for low-permeability reservoirs.Firstly, based on the definition of low-permeability "sweet plot", the sensitive elastic parameters of "sweet spot" are determined.On this basis, the elastic impedance inversion and "sweet spot" sensitive parameters prediction are proposed by the elastic impedance equation including the sensitive parameters of "sweet plot".This method reduces the cumulative error of indirect prediction of "sweet plot" and improves the accuracy of the "sweet plot" prediction.Combined with the Facies and fluids probabilities(FFP) technology, it achieves better results in the prediction of the "sweet plot" for the target area.