优化岩石物理模型以提高横波速度预测精度  

Prediction of Shear Wave Velocity by Using Optimized Rock Physical Models

作　　者：杨敏[1] 李明[1] 李艳东[1] 兰锋[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《石油天然气学报》2013年第7期74-77,3,共4页Journal of Oil and Gas Technology

基　　金：中国石油天然气股份有限公司科研项目(112506hx00230001)

摘　　要：横波速度对于地震资料的AVO(振幅随偏移距的变化)分析、地震叠前反演、流体识别等具有重要意义。然而实际测井数据中横波速度信息缺乏,因此横波速度预测已成为岩石物理研究的重要内容之一。首先针对碳酸盐岩的特殊性,将其孔隙分成3大类:硬孔隙、与黏土有关的孔隙、软孔隙(即裂隙孔隙);其次在DEM-Gassmann岩石物理模型基础上利用模拟退火优化方法引入虚拟裂隙孔隙度,弥补因岩石弹性参数、物性参数不准带入的误差;最后将该方法应用于实际测井资料的横波速度预测中。预测结果表明,横波预测精度相对未进行优化的预测结果有较大的提高,说明该方法是行之有效的,具有较强的实用性。S-wave velocity was of great significance for seismic AVO analysis , prestack seismic inversion and fluid identification.However , S-wave velocity data were lacking in actual logging data , therefore shear velocity prediction has become one of important research contents of rock physics.In consideration of the characteristics of carbonate rocks , their pores types were divided into 3categories , such as stiff pores , clay-related pores and soft pores ( fracture pores ), then based on DEM-Gassmann rock physical model , simulated annealing method was used to optimize the results by introducing virtual fracture porosity to make up for the errors induced by rock elastic parameters and physical parameters inaccuracy.Finally the method is used to predict the actual shear wave velocity , the results show that the predicted shear velocitys accuracy which is optimized has much greater improvement than the one which is not optimized , so it demonstrates that this method is effective with strong practicability.

关 键 词：岩石物理 横波速度 模拟退火 

分 类 号：P631.44[天文地球—地质矿产勘探]