摘要
传统的谱蓝化拓频比以往的拓频方法提高了地震数据的分辨率,但是由于整体考虑高频计算部分,导致拓频后的地震数据在低频部分经常出现频率抖动。为了得到更加准确的地震数据,对地震信号的拓频方式进行了研究,利用地下地层对不同的频率成分敏感度不同的特点,将分频技术应用在了谱蓝化方法上,提出了一种改进的谱蓝化算子。将地震数据分为多个频带,计算出各个地震频带内更加精细的谱蓝化算子,然后通过地震能量比加权平均因子计算新的分频谱蓝化算子,并将其应用在了模拟地震数据和实际地震数据上。通过对比传统谱蓝化拓频和分频谱蓝化拓频结果,可以看到,分频谱蓝化算子大大提高了地震信号的主频,拓频后的地震数据分辨率更高,其频谱特征更加符合实际地层反射,克服了低频部分失真的弊端,在提高薄储层精度方面具备较好的适用性。
The traditional spectral bluing extension frequency has improved the resolution of seismic data compared with the previous extension frequency methods.Due to the overall consideration of the high-frequency calculation part,the frequency jitter often occurs in the low-frequency part of the seismic data after the frequency extension.In order to obtain more accurate seismic data,the frequency extension method of seismic signals is studied.As the subsurface stratum have different sensitivity to different frequency components,the frequency division technology is applied to the spectral bluing method,and an improved spectral bluing operator is proposed.The seismic data is divided into multiple frequency bands,and the finer spectral bluing operators in each seismic frequency band are calculated.Then,a new sub-spectral bluing operator is calculated by the seismic energy ratio weighted average factor,and it is applied to the simulated earthquake data and actual seismic data.By comparing the results of traditional spectral bluing frequency extension and the sub-spectral bluing frequency extension,it is found that the frequency resolution of the seismic data after frequency upscaling by the spectrumsplitting operator is higher,and its spectral characteristics are more in line with the actual formation reflections,which overcomes the disadvantages of the low frequency distortion and has good applicability in improving the thin reserviors accuracy.
作者
张璐
汪毓铎
ZHANG Lu;WANG Yuduo(School of Information and Communication Engineering,Beijing Information Science&Technology University,Beijing 100192,China)
出处
《北京信息科技大学学报（自然科学版）》
2020年第1期63-68,共6页
Journal of Beijing Information Science and Technology University
基金
科技创新服务能力建设-提升计划项目-电气设备故障谐波诊断仪与处理系统(市级)(科研类)(71F1810933).
关键词
谱蓝化
地震分频
拓频处理
薄互层
spectral bluing
seismic frequency division
extension frequency
thin interbedded layer
作者简介
第一作者:张璐,女,硕士研究生;通讯作者:汪毓铎,男,教授。
