由于三维地震勘探成果绝大部分是时间域的,要与深度域钻测井资料紧密结合,时深转换是必不可少的重要环节.但常规时深转换方法主要是针对二维构造面提出的,难以满足三维数据体精细时深转换的要求.通过综合测井、地震、地质、油藏等多专业信息,以地震处理速度、钻井时深关系、高分辨率反演速度体、地震解释成果、声波测井曲线和已有地质认识为基础,借鉴剥层法和变速成图思想,针对三维体的精细时深转换提出了“高分辨率反演速度体+控制层位+层间网格智能剖分”的三维速度建模新方法.采用该方法建立的速度模型井间加入了地震信息和已有地质认识,较单纯用井数据插值更精确,且符合岩性分布变化趋势,同时较地震处理速度场具有更高的纵向分辨率和准确性.采用该方法进行三维体时深转换能够达到深度域地震数据体与测井曲线一一对应,便于油藏工程师进行储层连通性研究和开发方案优化调整.%Most results of 3D seismic exploration are in the time domain,therefore the time-depth conversion is necessary when they are combined with the drilling and logging data in the depth domain.However,the conventional time-depth conversing methods are mainly for the 2D structural interfaces,so they are very hard to meet the requirements of the fine time-depth conversion of the 3D data volume.By means of integrating multidisciplinary professional information such as the well logging,seismic survey,geology,oil reservoir engineering and so on,on the basis of the seismic processed velocity,drilling time-depth relationship,high-resolution inversed velocity body,seismic interpreted result,sonic log and known geological understandings,with the help of tripping method and variable velocity mapping ideas,in the light of the fine time-depth conversion of the 3D body,the new 3D velocity modeling was presented for "high-resolution inversed velocity body+controlled horizon+intelligent division of the interlayer grid".Thanks to the added seismic information and the understandings stated above between the wells,the data interpolation of the established velocity modeling by the method is more precise than that of the individual interpolation by the well data,and moreover is consistent with the changed trend of the lithological distribution.At the same time,it has more higher vertical resolution and accuracy than those of the seismic processed velocity field.With the help of the method,the time-depth conversion of the 3D body can achieve the one-to-one correspondence between the seismic data body and the logging curve in the depth domain,thus it is convenient for the oil reservoir engineer to research the reservoir connectivity and optimize & adjust the development programs.
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