近似真地表处理基准面的逆向统一构建及应用——以准噶尔南缘安集海背斜三维为例  

Reverse unified construction and application of approximate true surface processing datum:acasestudy of the Anjihai anticline in southern margin of Junggar basin

作　　者：罗勇[1] 杨晓海[1] 妥军军 郑鸿明[1] 谭佳[1] LUO Yong;YANG XiaoHai;TUO JunJun;ZHENG HongMing;TAN Jia(Geophysical Research Center,Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Ürümqi 830011,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院地球物理研究所,乌鲁木齐830011

出　　处：《地球物理学进展》2021年第6期2531-2539,共9页Progress in Geophysics

基　　金：国家科技重大专项“准噶尔前陆冲断带油气成藏、关键勘探技术及新领域目标优选”(2016ZX05003-005)资助。

摘　　要：准噶尔盆地南缘复杂构造近似真地表叠前深度偏移技术研究逐步深化,但成像精度始终难以满足精确落实构造和圈闭特征的要求,究其原因除了信噪比极低、地震波场复杂之外,关键是始终未解决好不同处理基准面的偏前数据与深度速度模型的匹配问题.本次研究从近似真地表叠前深度偏移出发,精选地表小平滑面作为偏移基准面,并通过时深转换方法逆向构建成静校正计算底界面和时间域CMP处理参考面,开展时间域高频道间时差校正、近地表速度模型反演以及DSR动静校正处理,规避了时间域到深度域不同处理基准面的地震数据校正问题以及转换产生的误差.另外,将初至层析反演的近地表速度模型和超深微测井相结合,提高叠前深度偏移浅层速度模型精度,通过井控优选速度模型融合面,建立初始的全深度速度模型.南缘安集海背斜三维实际资料应用证实了逆向统一构建处理基准面技术思路的有效性和合理性.The southern margin of Junggar basin complex structural approximate real surface prestack depth migration technology research gradually deepened,but imaging precision is always difficult to meet the requirements of precise implementation structure and trap characteristics,investigate its reason in addition to very low SNR complex seismic wave field,the key is still hasn’t been solved before the partial data in different processing datum and depth velocity model matching problem of the study from the approximate real surface prestack depth migration,select small smooth surface as the migration datum,and through the time-deep conversion method reverse construction into static correction calculation bottom interface and CMP reference plane processing in time domain,to carry out the time difference between high time domain channel correction Near-surface velocity model inversion and the DSR statics processing,avoid the different processing time to depth domain datum correction problem of seismic data and the conversion error.in addition,the near-surface velocity model of initial tomography inversion is combined with ultra;eep micro logging,improve precision of the shallow velocity model of pre-stack depth migration,well control through optimizing surface velocity model fusion,the full depth of the initial velocity model AnJiHai anticline in the south margin of 3 D actual data application prove the validity and rationality of reverse unified processing datum technology ideas.

关 键 词：近似真地表 叠前深度偏移 高频时差校正 层析反演 DSR动静校正 全深度速度模型 

分 类 号：P631[天文地球—地质矿产勘探]