长源距声波测井资料处理中提取S波的自适应方法  

Adaptive method for separating out shear wave in long-spaced acoustilog data processing

作　　者：杨选辉[1] 沈萍[2] 郑治真[1] 刘希强[3] 

机构地区：[1]国家地震局地震数据信息中心 [2]国家地震局地球物理研究所 [3]山东省地震局

出　　处：《石油地球物理勘探》1998年第6期769-774,共6页Oil Geophysical Prospecting

摘　　要：长源距声波测井是油田估算相对应力剖面的常用方法。该方法要求P波和S波的初至都清楚。但实际的测井资料，由于介质较“松软”（会有水、气、油），S波发生频散、波形畸变、强度很微弱，使S波的测定遇到很大困难。本文提出了从长源距声波测井资料处理中提取S波的自适应消嗓方法。该方法能在强干扰（P波尾）背景下，提取微弱的S波，从而开拓了声波测井方法在“松软”介质油田区的应用。通过声波测井资料的P波与S波的分离处理，证明了新方法的适用性。Long-spaced acoustilog is a method for estimating the relative stress section inoil fields. The method needs clear first breaks of both compressional wave andshear wave. Shear wave in real acoustilog data can hardly be separated out becauseof its frequency dispersion, distorted waveform and weak energy which result frommedium 'soft' (there exist water, gas and oil ). Authors put forward an adaptivenoise elimination method for deriving shear wave from long-spaced acoustilog data.This method can be used to derive weak shear wave from strong noise background(compressional wave tail), so that it finds its application in 'soft' medium oilfields. The processing result of separating P wave from S wave in acoustilog dataproves the method feasible.'

关 键 词：声波测井 自适应技术 测井资料处理 S波 长源距 

分 类 号：P631.814[天文地球—地质矿产勘探]