OBN数据波场分离技术在东海工区的应用  

Application of OBN Wavefield Separation in an Exploration Area of East China Sea

作　　者：李亚清 赵秀莲[1] 陈琳枝 李振伟 邢雯淋 LI Yaqing;ZHAO Xiulian;CHEN Linzhi;LI Zhenwei;XING Wenlin(Institute of Exploration and Development,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院,上海200120

出　　处：《海洋石油》2024年第3期39-43,共5页Offshore Oil

摘　　要：鬼波压制和拓频处理一直是东海工区高分辨率成像的重要研究内容。为获得高精度宽频地震数据,该文通过最新采集的海底节点(ocean bottom nodes,简称OBN)数据利用水检P分量和陆检Z分量检波器对地震波响应的极性差别,通过将P分量和Z分量数据相加(即双检合并)来实现接收点端鬼波压制。但由于检波器灵敏度和与海底耦合的差异,水检P分量和陆检Z分量在振幅、频率、相位等方面不一致,不能直接相加,因此有效的标定是波场分离的核心。该文利用交叉鬼波标定技术,分别将P分量的鬼波加入Z分量,将Z分量的鬼波加入P分量,从而对P、Z分量在振幅、频率及相位等方面进行有效标定。该方法拓宽了东海工区地震数据的频宽,提高了地震数据成像精度,可为圈闭描述和储层预测提供资料基础。Deghost and frequency-broadening processing have always been important research contents of high-resolution imaging in exploration area of East China Sea.In order to obtain high-resolution and broadband seismic data,the new ocean bottom nodes(OBN)seismic data in this area is used to attenuate all downgoing ghosts on the receiving side and broaden the frequency band by adding the Pcomponent and the Z-component data based on the polarity difference in the seismic wave response between the P-component hydrophones and the Z-component geophones.However,due to differences in instrument sensitivity and coupling with the seabed,the P component and Z component data are inconsistent in amplitude,frequency,and phase,making direct addition of the two components is impossible.Calibration is therefore essential for accurate wavefield separation.In this paper,the cross-ghost method is used to calibrate P and Z component.The ghost of P component is added to the Z component and the ghost of the Z component is added to the P component,respectively.Therefore,the P and Z component is calibrated in amplitude,frequency and phase.This method broadens the bandwidth of seismic data in an exploration area of East China Sea,increases the accuracy of seismic imaging,and provides important information for trap description and reservior prediction in this area.

关 键 词：东海工区 双检合并 交叉鬼波 PZ标定 波场分离 

分 类 号：TE952[石油与天然气工程—石油机械设备]