准南双复杂区高精度叠前地震成像关键影响因素研究  

Study on Impact Factor of High-Precision Pre-Stack Seismic Imaging for the Double Complex Area in Southern Margin of Junggar Basin

作　　者：罗勇[1] 杨晓海[1] 谭佳[1] 窦强峰 刘宜文[1] Luo Yong;Yang Xiaohai;Tan Jia;Dou Qiangfeng;Liu Yiwen(Geophysical Research Center,Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Urumqi,Xinjiang,830013,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,新疆乌鲁木齐830013

出　　处：《新疆地质》2020年第4期493-498,共6页Xinjiang Geology

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：准噶尔盆地南缘安集海背斜为典型双复杂油气勘探区,近年来多轮次二、三维地震叠前偏移成像均基于CMP浮动面。中、下组合资料偏移画弧严重,无法精准反映安集海背斜中下组合圈闭特征。通过大偏移距初至近地表结构反演和优势偏移距初至层析静校正相结合,解决了时间域高精度静校正问题,为后期深度速度模型提供了精确近地表模型。首次详细分析了浅地表方位各向异性对地震成像的影响,针对性采取基于地表小平滑面的时间域-深度域一体化、分方位处理成像对策,开展处理基准面试验、井控全深度速度建模的速度融合方法等,取得了理想的地震成像效果。地震成像质量明显提升,准确反映安集海背斜中下组合圈闭特征,对准噶尔盆地南缘各复杂探区高精度地震成像具非常重要的参考和推广价值。In southern margin of Junggar basin,the Anjihai anticline is a typical double-complex structure petroleum exploration area.In recent years,the trap characteristics of the middle-lower assemblage structure in the Anjihai anticline cannot be precisely implemented by the results of multiple rounds of pre-stack migration based on CMP floating datum,and the arcing phenomenon was very serious in the seismic data of middle-lower assemblage structure.In this study,near-surface structure inversion with large offset first arrival and statics correction with dominant offset first arrival are combined,It not only solves the problem of high-precision static correction in the time domain,but also provides an accurate near-surface model for the depth velocity model.And it is first time to analyze the influence of shallow surface azimuthal anisotropy on seismic imaging,the strategy of integrated processing imaging of time/depth domain and Azimuth based on small smooth surface was adopted.In addition,The research on processing datum selection and velocity fusion method for well control full-depth velocity modeling has been carried out.Through the above research,the seismic imaging has obtained the ideal effect,and the quality of seismic imaging has been significantly improved.the trap features of the middle-lower assemblage structure in the Anjihai anticline have been accurately implemented.It is great reference value and extension value for the high-precision seismic imaging in the complex exploration areas in the southern margin of Junggar basin.

关 键 词：CMP浮动面 近地表模型 层析反演 方位各向异性 偏移基准面 叠前深度偏移 

分 类 号：P631.4+43[天文地球—地质矿产勘探]