时频分析技术在储层分析中的应用

The application of time-frequency analysis in reservoir analysis

刘苗

LIU Miao

中国石油化工股份有限公司上海海洋油气分公司研究院, 上海 200120

Institute of SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

时频分析是对地震信号进行分解,可以在不同频带上显示不同级别的地质现象。采用连续小波变换方法,对地震资料进行储层时频分析和分频属性提取,时频主极值频率曲线与伽马曲线有较好对应关系,尤其是其低频趋势线。对A区块周边的两口井井旁道进行了时频分析,揭示出该区15Hz低频数据体与储层及含油气相关性较好。针对这一特征,对该区三维地震体进行了运算及属性提取,描述其储层展布。

Time-frequency analysis method is used to decompose the seismic signals into time frequency domain in order to show the geological phenomena in multi-scales. Continuous wavelet transform is used to analyze and extract the time-frequency attributes. The result shows that the main extreme frequency curves are fit to the GR curves, especially the low frequency trends. In this paper, the method is used to analyze the seismic data around two wells near the area A, and the result reveals that 15 Hz low frequency seismic data has better correlation with the reservoirs and hydrocarbon. 3D seismic data has been processed and its attributes have been extracted due to this feature and reservoir distribution in this area is described.

https://doi.org/10.3969/j.issn.1008-2336.2011.02.039