声学全波形反演预测饱和度  

Prediction of saturation using acoustic full waveform inversion

作　　者：石玉梅[1] 谢韬 宋建勇[1] 杨志芳[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《石油学报》2017年第11期1284-1292,共9页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.41504110);中国石油天然气集团公司基础研究项目(2016A-3301)资助

摘　　要：饱和度是储层定量描述的重要参数之一,研究饱和度对于地下流体分布、储量估计及井位设置都至关重要。基于全波形反演提供的高精度地层弹性参数,研究了地震饱和度预测方法。通过数学分析和数值计算,讨论了流体体积模量和孔隙空间体积模量特征及其对流体的敏感性,并在此基础上,提出了利用两参数全频带声学全波形反演和Brie公式预测饱和度的方法。通过数值计算,分析了体积模量和密度反演误差及Brie公式中指数因子误差对饱和度预测的影响。通过四川广安气田实际地震数据反演和饱和度预测,进一步验证了方法的有效性。As an important parameter of quantitative reservoir description,saturation is a great significance for obtaining underground fluid distribution,reserve estimation and well-site settings.Based on the high-precision stratigraphic elastic parameters supplied by full waveform inversion,the seismic saturation prediction method is studied herein.Through mathematical analysis and numerical calculation,the characteristics of fluid bulk modulus and pore space bulk modulus are discussed as well as their fluid sensibility.On this basis,saturation prediction method is proposed based on the acoustic full waveform inversion of two parameters with full spectrum band and Brie formula.The influence of the inversion error of bulk modulus and density and the error of exponential factor in Brie＇s fluid mixing equation on saturation prediction is also analyzed by numerical calculation,which provides the basis for the reasonable and effective application of the method.The validity of this method is further verified through the actual seismic data inversion and saturation prediction of Guang＇an gasfield in Sichuan province,China.

关 键 词：声学全波形反演 岩石物理 体积模量 饱和度 预测 

分 类 号：P316[天文地球—地震学]