微测井与方位加权插值精细近地表速度建模技术  

Near-surface velocity modeling based on micro-log and azimuth-weighted interpolation

作　　者：金昌昆 王延光[3] 尚新民[1] 崔庆辉[1] 王东凯 JIN Changkun;WANG Yanguang;SHANG Xinmin;CUI Qinghui;Wang Dongkai(Geophysical Research Institute,Shengli Oilfield Branch Co.,Sinopec,Dongying,Shandong 257022,China;Postdoctoral Scientific Research Workstation,Shengli Oilfield Branch Co.,Sinopec,Dongying,Shandong 257002,China;Shengli Oilfield Branch Co.,Sinopec,Dongying,Shandong 257000,China)

机构地区：[1]中国石化胜利油田物探研究院,山东东营257022 [2]中国石化胜利油田博士后科研工作站,山东东营257002 [3]中国石化胜利油田分公司,山东东营257000

出　　处：《石油地球物理勘探》2020年第2期257-265,I0001,I0002,共11页Oil Geophysical Prospecting

基　　金：国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006);中国博士后科学基金第64批面上项目“基于斜率层析的起伏地表初至反射联合速度反演方法研究”(2018M642696)联合资助。

摘　　要：为构建精细地表速度模型,提出一种基于微测井层析的方位加权插值建模方法:首先将层析成像原理应用于微测井走时数据,获得各观测点处的精细速度分布;再根据层位信息通过深度变换使各点深度-速度关系标准化;然后基于径向基函数和方位基函数,反演求解主方位权重系数并加权插值;最后对插值结果作深度反变换,获得最终的近地表速度模型。通过米泉地区激发井深设计和陈官庄地区精细表层建模两个应用实例,分别测试了微测井层析成像和方位加权插值建模方法,取得了良好的应用效果。与常规微测井解释、普通克里金插值建模方法相比,文中所提方法结果的分辨率更高。To build a good surface velocity model,we present a method using micro-log tomography combined with azimuth-weighted interpolation.The velocity at each observation point is calculated using tomography of micro-log travel time,and the depth-velocity relation is normalized through depth transformation constrained using horizons.The weight coefficients at main azimuths are inverted using a radial basis function and azimuthal basis function,followed by weighted velocity interpolation.After inverse depth transformation,we obtain the final near-surface velocity model.Two case studies,i.e.shooting depth design in Miquan and detailed nearsurface velocity modeling in Chuanguanzhuang,show that micro-log tomography and azimuth-weighted interpolation yield good results with higher resolution than those derived from conventional well log interpretation and Kriging interpolation.

关 键 词：微测井 层析成像 速度建模 近地表 方位角 插值 

分 类 号：P631[天文地球—地质矿产勘探]