优化三维层位控制法速度建场及其应用

随着地质勘探的不断深入,对构造图的精度要求也越来越高,因此,对速度场建立和变速构造成图方法也提出了更高的要求。针对二维地震资料,在常规层位控制法速度建场基础上,利用优化的层控法,重点对叠加速度库和t₀层位库有机结合,分块、分段拾取各控制层t₀时间变化率;在三维空间建层模型,计算层速度;基准面选取及校正;利用折射线追踪法进行时深转换;利用测井曲线入库,快速对层速度校正及钻井分层数据对深度图进行校正几个方面进行了研究,提高了成图精度,取得了理想的成图效果。

Developing Seismic Velocity Field by Optimized 3D Horizon Control Method and Its Application

With the development of technologies for geological exploration,the structural maps with higher accuracy have been needed,and the higher requirements for developing seismic velocity fields and structure-mapping methods with variable velocities have been proposed.In this paper,studies on combination of stack velocity field with t 0 horizon field,picking up t 0 time varied rate in different blocks and segments of all controlling horizons are conducted,based on the2D seismic data,conventional hori-zon control approach for developing seismic velocity field and using optimized horizon control method.Also,by developed3D model,the interval velocity is calculated,base-level selection and correction is made,time-depth conversion is performed with re-fracted tracing method;by well log input data,quick corrections of interval velocity and depth maps by using drilling individual-layer data are discussed.Hence,the mapping accuracy could be improved,obtaining satisfied effects of mapping structures.