摘要
利用VSP资料可以较好地解决地面多分量转换波的层位标定问题,其基本原理和方法是:首先利用水平分量的下行横波获得横波初至,利用水平分量的上行转换波获得上行转换波的双程时间剖面,利用垂直分量剖面获得纵波初至;然后由纵波初至和横波初至得到转换波的时-深关系;再通过转换波的时-深关系和双程时间剖面对过井转换波剖面进行层位标定。应用该方法对广安地区05GA3C04线过GA101井的地面三分量转换波偏移剖面进行了层位标定,并将标定结果用于纵波与转换波的联合解释和岩性剖面解释,得到的结果与工区内的钻井结果吻合。
VSP data can be used to solve the horizon calibration problem of ground three-component converted wave well.The basic princi- ple is that the two way time of converted wave is the sum of P- wave first break and S-wave first break.Firstly,the down-going S- wave of horizontal component is used to obtain the first break of S- wave;the up-going S-wave of horizontal component is used to gain the two-way time profile of up-going converted wave;the vertical component section is used to get the accurate first break of P-wave. Then,the time-depth relationship of converted-wave is obtained from the first break of P-wave and S-wave.Finally,horizon cali- bration is carried out on cross-well converted wave sections through time-depth relationship and two-way time profile.The method was applied to the horizon calibration of ground three-component con- verted wave migration profile through well ga101,05GA3C04 line in Guang'an area.The result was applied to the joint interpretation and lithologic profile interpretation of P-wave and converted wave.The interpretation result coincides with the drilling information of the area.
出处
《石油物探》
EI
CSCD
2008年第2期183-185,19,共3页
Geophysical Prospecting For Petroleum
关键词
多分量勘探
转换波
层位标定
零井源距VSP资料
时-深关系
multi-component exploration
converted wave
horizon calibration
zero offset VSP data
time-depth relationship
