基于分频CMY融合优化的地震沉积学技术在西湖凹陷浅层河道刻画中的应用  

Application of Seismic Sedimentology Based on Frequency Division CMY Fusion Optimization in Shallow Channel Characterization in Xihu Depression

作　　者：袁悦 Yuan Yue(Shanghai Branch of CNOOC(China)Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《工程地球物理学报》2024年第4期645-653,共9页Chinese Journal of Engineering Geophysics

基　　金：“十四五”国家重大科技项目(编号:KJGG2022-0402);中海石油(中国)有限公司上海分公司生产性科研项目。

摘　　要：西湖凹陷QY-HY地区花港组浅层H2时期发育浅水三角洲沉积背景,河道砂体薄、期次多且河道变化快,传统方法难以准确识别河道展布,本文创新性应用分频CMY(Cyan-Megenta-Yellow)融合方法对地震数据体进行全频段扫描,针对目的层砂体响应特征对原始地震资料进行有效整合优化,在此基础上基于等时地层格架约束对H2层段开展地震沉积学研究,刻画H2层段河道及对河道沉积演化进行分析。最终,在H2底部识别3条河道,在H2顶部识别出8条以上河道,且河道规模长度等都有所变化。研究表明:H2时期整体为水进特征,发育自西向东河道,早期单河道规模大,河道分支少,晚期由于水面上升,单河道规模减小,河道分支增加。采用分频CMY融合方法优化的地震沉积学在刻画小规模河道及沉积演化方面具有一定可行性。A shallow delta was developed in the H2 Fm of QY-HY area in Xihu sag,where the thin channel sand body involves multiple periods and changes rapidly.It is difficult to accurately identify the channel distribution by the traditional method.Based on the characteristics of the sand body of the target layer,this paper effectively integrated the specific frequency band of seismic data,built isochronal strati-graphic framework,applied seismic sedimentary technology on the H2 Fm,characterized the H2 channel and analyzed the sedimentary evolution of the H2 Fm.By the innovative application of frequency division and CMY(Cyan-Megenta-Yellow)fusion to all-band-scan the seismic data.The results show that the whole period of H2 is characterized by water intrusion,and the river channel develops from west to east and the scale of early channel is larger than that of late channel.The seismic sedimentology optimized by the frequency-division CMY fusion method has certain feasibility in characterizing small-scale channels and sedimentary evolution.

关 键 词：西湖凹陷 浅水三角洲 分频CMY融合 河道刻画 地震沉积学 

分 类 号：P631.4[天文地球—地质矿产勘探]