摘要
渤海许多油田目前处于高含水低采收率阶段,亟需对油田的潜力进行深入研究,维持稳产。其中渤海B油田经过20年的定向井开发,一套层系合采强注,层间干扰严重,对剩余油的挖潜存在困难。由于现有地震资料分辨率有限,无法识别辫状河复合砂体内部的储层结构,包括隔夹层和薄砂体的纵、横向展布,因此目前主要采用定向井开发。本次提出地震信号谐波提频技术,使用地震数据中的基波信号预测谐波、次谐波信号,再将所有谐波信号叠加到原地震数据中,以拓展高频端和低频端地震信号,达到提频目的。该方法突破传统褶积模型的限制,不再需要估计地震子波、无需假设地层反射系数稀疏、无需井信息等等,减少人为主观因素。通过动静态信息验证,能有效精细识别辫状河砂体内部结构,指导定向井改为水平井开发,避免层间干扰,有效助力高效开采剩余油。
Many oil fields in the Bohai Oilfield are currently in the stage of high water cut and low recovery.Thus,it is urgent to conduct in-depth research on the potential of these oil fields to maintain stable production.After 20 years of directional well development,Bohai B Oilfield has developed a set of layers with combined production and strong injection,resulting in severe interlayer interference and difficulties in tapping the potential of the remaining oil.Owing to the limited resolution of existing seismic data,it is not possible to identify the reservoir structure inside the braided river composite sand body,including the vertical and horizontal distribution of the interlayer and thin sand body.Therefore,directional well development is currently mainly used.Here,the seismic signal harmonic frequency enhancement technology is proposed,which directly uses the fundamental component of seismic data to predict harmonic and subharmonic information,and then adds it to the original seismic data to expand the high-frequency and low-frequency seismic information,achieving the purpose of frequency enhancement.This method overcomes the limitations of traditional convolutional models,eliminating the need of well information and to estimate seismic wavelets and assume sparse stratigraphic reflection coefficients,thereby reducing the human subjective factors.The research results,verified through dynamic and static information,showed that the seismic signal harmonic frequency enhancement technology can effectively and finely identify the internal structure of braided river sand bodies,help to transform directional wells into horizontal wells for development,avoid interlayer interference,and promote efficient extraction of the remaining oil.
作者
韦红
白清云
孙佳林
张鹏志
孟云涛
WEI Hong;BAI Qingyun;SUN Jialin;ZHANG Pengzhi;MENG Yuntao(China National Offshore Oil Corporation Limited Tianjin Branch,Tianjin 300459,China)
出处
《CT理论与应用研究（中英文）》
2024年第5期577-584,共8页
Computerized Tomography Theory and Applications
关键词
地震信号
谐波
辫状河砂体
分辨率
seismic signal
harmonics
braided river sand bodies
resolution
