震源组合对高精度勘探成像精度的影响  

The influence of combination vibroseis on imaging accuracy of high-precision exploration

作　　者：曾昭翰 裴云龙[1] 蒋波[1] 吴婷[1] 

机构地区：[1]中国石油化工股份有限公司石油物探技术研究院,江苏南京211103

出　　处：《物探与化探》2016年第1期61-65,共5页Geophysical and Geochemical Exploration

基　　金：国家科技重大专项项目(2011ZX05035-002)资助

摘　　要：为确保可控震源的激发效果,目前国内均采用多台震源组合的方式施工,但这种施工方式在野外采集阶段即令原始地震资料产生不同相叠加,影响最终成像精度。通过理论计算、统计对比和模型正演分析手段,结合实际地震资料分析找出了此影响在时空域的规律,并据此提出在复杂地表区域采用台数较少的震源进行面积组合,由此造成的能量不足、信噪比偏低的不利影响,可以利用高覆盖次数、优化检波器组合的方式来弥补。在西部某工区的施工效果显示,该方法能在保证资料成像效果的基础上进一步缩短采集周期、降低采集成本,尤其在复杂地表地区这种施工方式可实现度也更高,更符合高精度地震采集的发展趋势。The explosive effect of vibroseis is directly related to the quality of acquired data by vibroseis.Usnally combined excitation of means is used to ensure energy.This method will theoretically influence the effect of seismic data.The reflection time difference between the combinations lead to out-phase stacking, which affects the geological imaging precision.Through theoretical calculation, modeling and real seismic data analysis,the authors found the influence regularity of time-space domain. With less number of vibroseis area array, combined with high folds and geophone array,we can effectively reduce the influence.This method also improves the efficiency and re- duce cost, is easier to implement in the complex surface area, and is more suitable for high precision acquisition.

关 键 词：震源组合 组合基距 成像精度 模型正演 

分 类 号：P631.4[天文地球—地质矿产勘探]