基于AVO正演模拟的泊松比反演  

Poisson's ratio inversion based on AVO forward modeling

作　　者：王云专[1] 李素华[1] 朱伦[1] 王开燕[1] 

机构地区：[1]大庆石油学院地球科学学院,黑龙江大庆163318

出　　处：《大庆石油学院学报》2006年第1期7-9,15,共4页Journal of Daqing Petroleum Institute

摘　　要：AVO(Amplitude Versus Offset)效应反映了地震反射振幅随炮检距的变化,利用AVO效应可以预测储层参数并识别油气异常.当地层中含有油气时,泊松比参数发生明显变化,产生AVO异常.通过正演AVO模拟,分析了不同泊松比和储层厚度组合下,AVO效应特征参数(AVO截距和梯度)之间的关系,提出了泊松比参数反演方法,得出了反演经验公式.通过对理论模型反演及实际地震资料试算表明,反演结果与实际值接近,应用该方法可预测目的层的泊松比及含气性.AVO responses indicate changes of seismic reflection amplitude with offset,AVO responses can be used to predict reservoir parameters and identify hydrocarbon anomalies.Poisson's ratio changes obviously in the hydrocarbon charged reservoir,AVO anomaly is very strong.We analyzed relations between AVO characteristic parameters(AVO intercept and gradient) in various combinations of Poisson's ratio and reservoir thickness by means of AVO forward modeling.Then a Poisson's ratio inversion method and an inversion experience formula are put forward.Inversion Poisson's ratios are close to real data.The efficiency of the method has been proved by accurate inversion results for theoretical models and real seismic data.Using this inversion method,we can predict the Poisson's ratio and whether or not to charge reservoir.

关 键 词：AVO效应 正演模拟 泊松比 反演 

分 类 号：P631.4[天文地球—地质矿产勘探]