基于时频分析的储层裂缝识别方法.doc

基于时频分析的储层裂缝识别方法?司马立强,杨洪鹏,姚军朋,张凤生,李勇( 西南石油大学资源与环境学院, 四川成都 610500 ) 摘要准确识别裂缝对裂缝性储层油气开发意义重大,通常采用双侧向电阻率的大小和差异识别裂缝,因其还受其它因素影响,故裂缝识别的分辨率不高。针对这些问题,本文从时频分析和短时傅立叶变换原理出发,采用时频分析方法挖掘双侧向测井的裂缝隐含信息,可以提高裂缝识别能力。将该方法运用于塔河油田的一批井中,研究表明:采用汉明窗函数并分别选择 239 和 29个采样点的长、短窗长求取电阻率曲线频谱及幅值,能较大程度提高裂缝分辨能力。该方法基于电阻率曲线的短时博里叶变换求取频谱特征识别裂缝,拓展了传统的电阻率测井识别裂缝的技术与方法。关键词双侧向电阻率时频分析短时傅立叶变换裂缝识别中文分类号: P631 I dentification of fracture bases on time-frequency analysis in reservoir SIMA Li-Qiang, YANG Hong-Peng, YAO Jun-Peng, Zhang Feng-Sheng, LI Yong ( Department of Resource and Environment, Southwest Petroleum University, Chengdu 610500 China ) Abstract Accurately identify fracture is significant for the development of oil and gas in the fractured reservoirs, commonly use the size and difference of bilateral resistivity to identify the fracture, because it is also affected by other factors, the resolution of the fracture identification is not high. To solve these problems, this paper study the principle of time-frequency analysis and short time Fourier transform, and then discuss the implicit information of the fracture in the dual laterolog by using the time-frequency analysis, which can improve the ability to identify fracture s. The method is applied toa number of wells in Tarim Oilfield, the results show that using Hamming window function and selecting 239 and 29 samples of the long and short window function to strike the