随钻地震中地层参数的预测

随钻地震是地震勘探技术和钻井技术的结合，随钻地震技术是利用钻井期间旋转钻头的振动作为井下震源，在钻杆的枯赔，井附近的地表埋置检测器，分别接收经钻杆，地层传输的钻头振动的信号。通过互相关和反褶积等数据处理方法，得到有关井下的地层信息，预测钻前地层速度和反射界面的深度等地层参数，随钻地震技术可以降低钻井成本，提高勘探开发综合经济效益。

Prediction of Formation Parameters in Seismic While Drilling

Seismic While Drilling is a drilling technique integrated with seismic technique. It uses the vibrations produced by a drill bit while drilling as a downhole seismic energy source.The continuous signals generated by the drill bit are recorded by a pilot sensor attached to the top of the drill string and by receivers located at selected positions around the borehole. The signals processed by cross correlation and deconvolution can be used to predict subsurface conditions (layer velocity,depth of reflected interface,etc.)ahead of the drill bit at any time during drilling.By Seismic While Drilling,drill cost can be reduced and economic benefit enhanced in petroleum exploration and exploitation.