利用黏滞—弥散波动方程理论进行油水识别  

Oil-water recognition based on diffusive-viscous wave equation

作　　者：胡军辉[1,2] 文晓涛[1] 许艳秋[3] 王文化[1] 杜正聪[3] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]中国石油东方地球物理公司长庆物探处,陕西西安710018 [3]攀枝花学院,四川攀枝花617000

出　　处：《石油地球物理勘探》2016年第3期556-564,417-418,共9页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(41174115);国家重大专项(2011ZX05025-003);油气藏地质及开发工程国家重点实验室开放基金项目(PLC201402)联合资助

摘　　要：含水和含油气储层在时间—空间域的地震响应特征无明显差异,而在频率域的响应特征有较明显的差异,即在流体检测中频率类属性对地震波衰减较敏感。为此,利用黏滞—弥散波动方程理论进行数值模拟,提出一种分析储层主频差、频带宽度差及频谱相似系数的流体检测方法。通过模型实验及实例分析,得到如下认识:1含油层表现为高主频差、高频带宽度差、低频谱相似系数的特征,含水层则表现为低主频差、低频带宽度差、高频谱相似系数的特征;2频率衰减梯度、低频阴影检测等传统的流体检测方法,存在参数选取缺乏理论依据、工作量大、油水识别不敏感等不足;3本文的流体检测方法,通过分析储层顶、底主频差、频带宽度差、频谱相似系数,可以有效地检测与识别不同的含流体储层,并且具有油、水识别准确、工作量小、计算效率高等优势。Seismic characteristics of oil-saturated and water-saturated reservoirs are less different in the time-space domain,but they are much more different in the frequency domain.This phenomenon means frequency attributes are more sensitive toseismic attenuation in fluid detection.We propose an approach for oil-water recognition based on the theory of viscous-dispersive wave equation.This approach detects fluid by analyzing dominant frequency difference,frequency bandwidth difference and spectrum correlation of reservoir.According to model experiment and real data analysis,the following observations are obtained:(1)Oil-saturated reservoir has higher dominant frequency difference,larger frequency bandwidth difference,and lower spectrum correlation,while water-saturated reservoir has opposite characteristics;(2)Conventional fluid detections with larger workload have difficulties in parameter extraction and low sensitivity to the difference between oil-and water-saturated;(3)The proposed approach can effectively detect fluid and accurately recognize oil and water.

关 键 词：黏滞—弥散波动方程 油水识别 流体检测 时频分析 数值模拟 

分 类 号：P631[天文地球—地质矿产勘探]