叠前时间偏移技术在煤田地震资料处理中的应用

在共炮点道集上，采用Kirchhoff积分法，提取所有深度点上延拓波场的成像值，并对所有的炮集记录按地面点相重合的叠加原则进行叠加，形成共反射点道集叠加。叠前时间偏移技术的关键是做好预处理、叠前去噪、静校正、叠前数据的动校正切除、建立准确的叠前时间偏移速度场、地震数据的镶边等步骤。根据煤田地震勘探资料的特点，结合实例探讨叠前时间偏移技术应用到煤田地震资料处理中应注意的问题。结果表明：叠前时间偏移技术能够有效地提高构造复杂地区煤层的成像效果，提高煤田地震资料的信噪比和分辨率。

Application of Prestack Time Migration Technology in Coalfield Seismic Data Processing

By the use of Kirchhoff integral on the common-shot gather, pick up imaging values of continuation wave field on all depth points and stack all shot gather records based on the principle of coincided with surface point, to form the stacking of common-reflection point-gather. The sticking point of the prestack time migration technology is to get done with preprocessing, prestack noise abating, statics, prestack data dynamic correction muting to establish unerring prestack time migration velocity field, seismic data edging. According to the peculiarity of coalfield seismic data, discussed par example of problems need to pay attention to use the prestack time migration technology on coalfield seismic data processing. The results demonstrated that this technology can improve imaging of coal seams in structure complicated areas and coalfield seismic data signal-to-noise performance and resolution effectively.