【摘要】 大庆长垣油田高含水后期的剩余油挖潜研究对地震资料的品质要求极高,虽然地表高程变化不大,但近地表结构横向变化复杂,现有的野外静校正方法难以满足精度要求,包括微测井模型静校正、折射波静校正以及基于CMP面的前两种静校正组合方法。为此本文提出一种基于近地表模型约束的折射波层析静校正技术。在精细解释微测井数据的前提下,建立近地表模型,计算模型静校正量,并以此建立层析反演的初始速度模型;结合长垣油田近地表结构特点,拾取单炮记录的折射波初至负起跳时间,反演迭代计算层析静校正量;针对工区炮点边界及采集变观区,依据两种静校正量差异趋势面,分区域组合来确定最终静校正量。喇嘛甸工区三维地震资料的高分辨率处理结果表明该方法优于以往所采用的静校正方法。更多还原

【Abstract】 High quality seismic data is imperatively needed for residual oil development in Daqing Changyuan.The near surface changes rapidly in Changyuan area,although its surface is flat.The existing statics methods,such as micro-logging model statics,refraction statics,and the combination of these two,could not meet statics precision requirement.Tomography static of refraction first break constrained with near surface model is proposed in this paper.Based on micro-logging data interpretation,a near surface model is built to calculate model statics,and to build an initial tomography velocity model.According to the characteristic of near surface,the wave trough time of refraction first break is picked up to obtain the time delay of each seismic trace for tomography statics computation.For shot boundary and irregular geometry areas,final statics will be determined according to the time difference trend between model statics and refraction statics.The high resolution results of Lamadian 3Dseismic survey have proved the priority of this method.更多还原