微测井约束分步层析静校正技术在古峰庄地区的应用

Application of the step tomographic static correction technique constrained by uphole survey in Gufengzhuang area

针对地表剧烈起伏,速度纵、横向变化大的复杂区,层析静校正较以往的折射波静校正方法有明显的优势,但是受初至时间拾取精度、炮检距的选择、近地表模型约束等问题的影响,层析反演的精度还不能满足低幅度构造预测的需求,为此提出微测井约束分步层析的静校正方法,即将浅层速度模型与最终近地表模型分步进行层析反演,并应用微测井信息约束浅层速度模型层析反演,有效地提高了近地表速度模型反演的精度,通过在古峰庄地区的应用较好地解决了复杂地表条件下的静校正问题,低幅度构造预测精度得到提高.

The tomographic static correction technique has obvious advantages over the conventional refraction wave static correction methods,especially in complicated surface.However,the accuracy of tomographic inversion can not meet the needs of low-relief structures prediction,because of the impact of the first break time picking accuracy,offset selection,constraint near-surface model and other issues.Therefore,the step tomographic static correction technique constrained by uphole survey is applied.The very shallow layer velocity model and the final near-surface model are inverted step by step,and the very shallow layer velocity model tomographic inversion is constrained by micro-log information.The inversion accuracy of near-surface velocity model is effectively improved.Through the application in Gufengzhuang area,the problem of static correction under complex surface conditions is solved,and the prediction accuracy of low-relief structures is improved.