黄土塬地区地震资料处理浮动基准面的选择及应用  

Selection and Application of Floating Datum in Seismic Data Processing in Loess Plateau Area

作　　者：徐蔚亚[1] 赵艳平[1] 陈世军[1] XU Weiya;ZHAO Yanping;CHEN Shijun(Petroleum Exploration and Production Research Institute,Sinopec,Beijing 100083,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《新疆石油地质》2021年第1期113-119,共7页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2017ZX05005-004);中国石化科技部项目(P17021-4)。

摘　　要：鄂尔多斯盆地南部黄土塬地区属于双复杂地区,为减小固定基准面在地震资料静校正中引起的误差,时间域的地震资料处理常在浮动基准面上进行。对比平均静校正量浮动基准面、高程浮动基准面和固定基准面对地层反射波自激自收时间的影响,指出在地表起伏较大、低降速层较厚的黄土塬地区,高程浮动基准面可以更好地降低地表高程剧变及较厚低速层对地震资料处理的影响。实际地震资料处理也证明,采用高程浮动基准面在速度分析和动校拉伸畸变切除控制中更具有优势。The loess plateau area in the southern Ordos basin is of“double complexity”,namely very rugged surface and super⁃thick LVL(low velocity layer).In order to reduce the error caused by static correction on a fixed datum,seismic data processing in time domain is of⁃ten carried out on a floating datum which is selected in different ways.The comparison of how floating datums based on average statics,ele⁃vation and a fix value influence t0 reflections indicates that,in the area with rugged surface and thick LVL,an elevation floating datum is very helpful to reduce the influences of drastically changing elevation and thick LVL on seismic data processing.The actual seismic data processing also proves the advantages of an elevation floating datum in velocity analysis and NMO stretching and mute processing.

关 键 词：鄂尔多斯盆地 黄土塬地区 地震资料处理 浮动基准面 平均静校正量 自激自收时间 速度分析 动校拉伸 

分 类 号：P631[天文地球—地质矿产勘探]