“真”地表叠前深度偏移方法在BS盆地的应用  

Application of“true”surface pre-stack depth migration method in the BS Basin

作　　者：李书瑜[1] 许冲[1] 郭廷超[1] 潘成磊[1] 鲍伟 谢天义 LI Shuyu;XU Chong;GUO Tingchao;PAN Chenglei;BAO Wei;XIE Tianyi(Geophysical Research Institute of Jiangsu Oilfield Company,SINOPEC,Nanjing 210046,China)

机构地区：[1]中国石化江苏油田分公司物探研究院,江苏南京210046

出　　处：《复杂油气藏》2025年第1期56-60,77,共6页Complex Hydrocarbon Reservoirs

基　　金：江苏石油勘探局科技项目“百色地区各向异性速度建模与成像技术研究”(JS21004)。

摘　　要：BS盆地位于华南褶皱带,石油资源潜力大。该区具有近地表和地下构造“双复杂”的特点,以往的地震偏移成像存在井震产状矛盾的问题,地震资料成像精度难以满足BS盆地石油勘探开发的需求。针对这一难题,研究了一种适合BS盆地的“真”地表各向异性深度偏移方法:首先,应用层控克里金插值方法获得全区各向异性参数场;其次,选择小尺度平滑的高程面作为偏移成像和速度建模的起始面,应用回转波层析反演技术建立近地表速度模型;然后,在各向异性场约束下进行中深层的旅行时走时计算,应用多种地质信息约束进行中深层速度建模迭代。实践应用表明,此方法较好地去除了地震资料存在的构造假象,成像结果与测井数据吻合较好,为研究区高精度勘探提供了高品质的数据。The BS Basin is located in the folded zone of South China,with great potential for petroleum resources.This area is characterized by the“dual complexity”of near-surface and underground structures.The previous seismic offset imaging has the problem of well-seismic mismatch,which makes it difficult for the imaging accuracy of seismic data to satisfy the oil exploration and development of the BS Basin.In response to this challenge,a“true”surface anisotropic depth migration method suitable for the BS Basin is studied.Firstly,the layer-controlled Kriging interpolation method is applied to obtain the anisotropic parameters for the entire area;Secondly,a small-scale smooth elevation surface is selected as the starting surface for migration and velocity modeling,and a near-surface velocity model is established by using the rotary-wave inversion technique;Then,under the constraint of anisotropic fields,the travel time of the middle-depth layer is calculated,and multiple geological information constraints are applied to the velocity modeling iteration in the middle-depth layer.The practical applications show that the method can effectively remove the structural artifacts in seismic data,and the imaging results are in good agreement with logging data,providing high-quality data for high-precision exploration in the study area.

关 键 词：“真”地表偏移 近地表速度建模 偏移面 BS盆地 

分 类 号：P631[天文地球—地质矿产勘探]