摘要
鄂尔多斯盆地东部地处黄土塬区,沟壑纵横、地形起伏非常大,受复杂地表条件及近地表结构等因素影响,原始地震记录的振幅、频率及相位在不同区域存在明显差异,这些差异与地下地质信息无关,容易导致解释陷入误区。因此,急需根据该区地震资料特点进行一致性处理方法研究,以提高资料保真度。在总结当前一致性处理方法的基础上,本文建立了复杂地表条件下新的地震资料一致性处理技术流程。在创新地表一致性振幅补偿思路的基础上,首次应用双域近地表Q吸收补偿技术,拓宽频带的同时,提高沟—塬连接线资料振幅、频率一致性;应用地表一致性俞氏子波反褶积,实现低频噪声的衰减及有效信号频带的拓宽,提高地震资料信噪比、分辨率的同时,进一步提高资料子波一致性。实际资料应用证实了该方法的可行性和有效性,具有良好的推广应用价值。
Located in the loess tableland area,the eastern Ordos Basin features criss-cross ravines and gullies and great topographic fluctuations.Its complex surface conditions and near-surface structures caused significantly different amplitudes,frequencies,and phases in the original seismic data of different regions.These differences are unrelated to the subsurface geological information and can easily lead to misinterpretation.Therefore,there is an urgent need to develop a processing method for seismic data consistency according to the characteristics of seismic data in the study area,aiming to improve the fidelity of seismic data.Based on the summary of the current con-sistency processing methods,this study built a new consistency processing flow for seismic data under complex surface conditions.By in-novating surface consistent amplitude compensation,this study employed the dual-domain near-surface Q-absorption compensation for the first time to broaden the frequency band and improve the amplitude and frequency consistency of seismic data collected across gul-lies and tablelands.In addition,this study applied the surface consistent deconvolution of Yu's wavelet to attenuate the low-frequency noise and broaden the effective signal frequency band,improving the signal-to-noise ratio,resolution,and wavelet consistency of seismic data.The actual application verifies that the method used in this study is feasible and effective and has a high popularization value.
作者
陈超群
戴海涛
高秦
陈俊杰
雒文丽
王智茹
CHEN Chao-Qun;DAI Hai-Tao;GAO Qin;CHEN Jun-Jie;LUO Wen-Li;WANG Zhi-Ru(Changqing Branch of GRI,BGP,Xi'an 710021,China;Gas Field Development,PetroChina Changqing Oilfield Company,Xi'an 710016,China)
出处
《物探与化探》
CAS
北大核心
2023年第4期954-964,共11页
Geophysical and Geochemical Exploration
基金
集团公司“十四五”科技项目“页岩油气地震地质工程一体化储层评价关键技术研究”(2021DJ3705)。
关键词
黄土塬
一致性处理
保真度
地表一致性振幅补偿
双域近地表Q吸收补偿
俞氏子波反褶积
loess tableland
consistency processing
fidelity
surface consistent amplitude compensation
dual-domain near-surface Q-absorption compensation
deconvolution of Yu's wavelet