摘要
地震数据可以看作是反射系数与带限子波的褶积,常见的带限子波主瓣延续时间长、旁瓣能量强,使厚储层内部出现旁瓣引起的假轴,不利于厚储层描述。宽带雷克子波(也称俞氏子波)主瓣窄、旁瓣幅度小,具有宽带雷克子波频谱特征的地震资料干涉现象弱,对厚储层的描述能力更强。本文使用基于地质统计信息的谱反演法,同时改进谱反演技术流程,得到拓展了高频和低频的宽频数据体,然后根据宽带雷克子波频谱特征设计滤波器对宽频数据体进行滤波,得到具有宽带雷克子波频谱特征的资料,从而提高储层描述精度。本文方法在渤海海域的多个油田进行了实际应用尝试,改善后的地震资料对厚储层的描述精度优于改善前,从而为油田开发方案的进一步优化提供了良好的数据支持。
Seismic data can be considered as the convolution between reflection coefficient and band limited wavelet.The usual wavelet is band limited and the main lobe has a long time and side lobe energy is strong,which leads to the false-axis inside thick reservoir and difficulty for thick reservoir description.Wide band Ricker wavelet,also known as Yu's wavelet,has narrow main lobe and small side lobe amplitude.Due to the weak interference effect,the seismic data with wide band Ricker wavelet's spectrum characteristics is more suitable for thick reservoir description.In this paper,the spectral inversion method based on the geological statistics is used,and the spectral inversion technique is improved,with which the broadband data bodies with high and low frequency are obtained.Then the broadband data is transformed to the data with wide band Ricker wavelet spectrum characteristics to improve the accuracy of reservoir description.The proposed method is applied in some oilfields in Bohai sea,and the improved seismic data is superior to the reservoir description,which provides a good data support to further optimize oilfield development plan.
出处
《中国海上油气》
CAS
CSCD
北大核心
2016年第3期62-69,共8页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司综合科研项目"渤海油田新生界火成岩发育区地震关键技术研究(编号:YXKY-2015-TJ-01)"部分研究成果
关键词
宽带雷克子波
谱反演
厚储层描述
地质统计信息
渤海
wide band Ricker wavelet
spectral inversion
thick reservoir description
geological statistics
Bohai sea
