高精度成像处理技术在丰城区块重处理中的应用

Application of High Precision Imaging Processing Technology in Fengcheng Block Data Reprocessing

早期采集的地震资料受技术条件限制,其处理剖面存在诸多问题,如偏移不到位,复杂断裂成像精度不够;中深层地层成像效果差,不能准确表达地层接触关系;剖面信噪比低,煤系地层中B4煤层成像精度不满足解释要求。为此根据矿方要求,采用新的处理技术重新处理。通过技术分析与试验,优选高精度成像技术处理流程,包括精细静校正、多域组合去噪、地表一致性与多道预测组合反褶积、克希霍夫绕射积分法叠前时间偏移等。结果显示,运用高精度成像处理技术重新处理后的剖面相对于原处理剖面在信噪比和分辨率方面均有显著改善,频带有效拓宽,反射波同相轴连续性提高,中深层地层、复杂断裂、断点等成像清晰,为地震方案的解释及矿方开展资源潜力评价奠定了良好的基础。

Subject to technological conditions,early stage acquired seismic data processed sections have existed many problems,such as migration imperfect,imaging precision of complex faulted structure insufficient,medium to deep strata imaging effect poor,can not express strata contact relation correctly,low section signal to noise ratio and coal measures coal B4 imaging accuracy can not satisfy interpretation requirement.For this reason,according to coalmine side demand,new processing techniques have been used in data reprocessing.Through technological analysis and test,optimized high precision imaging processing procedures including precision statics,multi-domain composite denoising,surface consistency and multichannel prediction combinatory deconvolution,Kirchhoff diffraction integral method prestack time migration etc.The result has shown that using high precision imaging processing technology reprocessed section relative to original processed section on signal to noise ratio and resolution aspects have improved obviously,frequency band effectively broadened,reflection phase axis continuity improved,medium deep strata,complex fault,faulted point etc imaging clear,thus have laid a good foundation for seismic scheme interpretation and coalmine side carrying out resources potential assessment.