精细井震分频标定及其特殊检验方法研究

The Research of Fine Frequency Division Well-to-seismic Calibration and Special Test Method

地震资料层位标定是连接地震、地质和测井信息的桥梁。利用声波测井资料合成地震记录标定的方法最为常用。分频标定充分考虑了不同频带资料所表示的信息,并准确地识别高频层序界面,有利于建立高频等时层序格架。合成记录制作完成以后,需要对所做的合成地震记录进行检查。为了检验标定结果的准确性,采用合成记录标定所获得的时-深关系先计算出层速度,进而获得均方根速度;然后通过反射波时距曲线方程计算出动校正的时间,将该时间运用于井旁地震道所对应的未作动校的叠前时间偏移CRP道集的动校正,对动校正效果进行分析。若道集的拉平效果良好,则说明标定结果较为准确。反之,则说明标定结果存在一定的问题。通过某工区一口井资料的实际应用,证明了此方法的合理性和可行性。

The horizon calibration of seismic data is the bridge that connect to seismic,geological and logging informations.The calibration method is most commonly used that synthetic seismogram using sonic log acoustic logging data.Frequency division calibration method full consider Information of different frequency bands data,and accurately recognize high-frequency sequence boundary,which is good for establish high-frequency isochronous sequence framework.After the manufacture of synthetic record,need to check the synthetic seismogram.In order to test accuracy of the calibration results,firstly,using the time-depth relationship that is obtained by synthetic seismogram calibration calculates the layer velocity,then get the RMS velocity,lastly,calculate the time of NMO correction by the equation of time distance curve of reflection wave,using this time makes NMO correction about the nearwell CRP gather of prestack time migration that do not make NMO correction.Analyze the effect of NMO correction,if the gather is flattened,that calibration result is accurate,on the contrary,it is illustrated that there are certainly problems about the result of calibration.Through practical application of one well in a work area,it is proved that the rationality and feasibility of this method.