检波器二次剩余定位方法与效果
|
摘要
浅海地震勘探中目前常用的两种检波器定位方法——声波定位方法和初至波定位方法各有优点和缺点。声波定位方法采收率低,水下接收器故障率高;初至波定位方法没有考虑折射波,且忽视了水深造成的影响。为此,提出用声波定位结果作为初始值,用直达波和折射波旅行时反演计算检波器位置的方法——检波器二次剩余定位方法。该方法在计算检波器位置的同时,反演计算了海水速度与海底速度,通过循环计算,提高了检波器定位精度。理论分析和实际资料处理表明,该方法比声波定位方法能反映更多细节,剩余定位后的道集波组特征更加明显,剖面质量有较大提高。
Both of the two commonly used geophone orientation positio- ning methods have their advantages and disadvantages.Acoustic o- rientation method is of low recovery rate while the underwater re- ceiver has a high failure rate.Meanwhile,the first break orienta- tion method does not take the refraction into consideration and ig- nores the effect of water depth.Therefore,the secondary residual orientation for geophone was proposed.In using this method,the acoustic orientation result is set as initial value,the travel-time of direct wave and refracted wave is inverted and calculated for the po- sition of geophone.At the same time,the speed of sea water and sea floor is also inverted.Through circular computations,the ori- entation accuracy of geophone is enhanced.Actual data processing indicates that the method can reflect more details than the acoustic orientation method and the gathers after residual orientation have stronger composite wave features,resulting in a great improvement of profile quality.
Both of the two commonly used geophone orientation positio- ning methods have their advantages and disadvantages.Acoustic o- rientation method is of low recovery rate while the underwater re- ceiver has a high failure rate.Meanwhile,the first break orienta- tion method does not take the refraction into consideration and ig- nores the effect of water depth.Therefore,the secondary residual orientation for geophone was proposed.In using this method,the acoustic orientation result is set as initial value,the travel-time of direct wave and refracted wave is inverted and calculated for the po- sition of geophone.At the same time,the speed of sea water and sea floor is also inverted.Through circular computations,the ori- entation accuracy of geophone is enhanced.Actual data processing indicates that the method can reflect more details than the acoustic orientation method and the gathers after residual orientation have stronger composite wave features,resulting in a great improvement of profile quality.
引文
1韩立强，常稳．海底电缆初至波二次定位技术的应用[J]．石油物探，2003，42(4)：501～504
2杨怀春，刘怀山，童思友等．声波二次定位技术在KD-1高精度地震采集中的应用[J]．海洋地质动态，2004，20 (4)：33～36
3宋玉龙．滩浅海地区地震勘探存在的问题及其解决方法[J]．石油物探，2005，44(4)：343～347
4宁靖，刘志田，吴学兵等。海底水听器的低频声纳-初至波联合定位方法研究[J]．石油仪器，2005，19(1)：39～42
5曾湘轶，杨文艳．浅析海底电缆地震采集作业二次定位系统[J]．石油地球物理勘探，2001，36(2)：220～226
6 Noel Zinn．Modeling velocity gradients in an OBC first-break positioning algorithm[A]．59th EAGE Con- ference & Exhibition，Geneva，1997
7冯凯，陈刚．罗敏学．二次定位技术的应用[J]．石油地球物理勘探，2006，41(3)：346～349
8杨正华，常军．海底电缆地震中二次定位法的探讨[J]．石油物探，2002，41(3)：330～333
9吴学兵，刘志田．宁靖．海洋石油勘探水听器二次定位新方法研究[J]．中国石油大学学报(自然科学版)，2006，30(5)：23～26
2杨怀春，刘怀山，童思友等．声波二次定位技术在KD-1高精度地震采集中的应用[J]．海洋地质动态，2004，20 (4)：33～36
3宋玉龙．滩浅海地区地震勘探存在的问题及其解决方法[J]．石油物探，2005，44(4)：343～347
4宁靖，刘志田，吴学兵等。海底水听器的低频声纳-初至波联合定位方法研究[J]．石油仪器，2005，19(1)：39～42
5曾湘轶，杨文艳．浅析海底电缆地震采集作业二次定位系统[J]．石油地球物理勘探，2001，36(2)：220～226
6 Noel Zinn．Modeling velocity gradients in an OBC first-break positioning algorithm[A]．59th EAGE Con- ference & Exhibition，Geneva，1997
7冯凯，陈刚．罗敏学．二次定位技术的应用[J]．石油地球物理勘探，2006，41(3)：346～349
8杨正华，常军．海底电缆地震中二次定位法的探讨[J]．石油物探，2002，41(3)：330～333
9吴学兵，刘志田．宁靖．海洋石油勘探水听器二次定位新方法研究[J]．中国石油大学学报(自然科学版)，2006，30(5)：23～26
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心