三分量数字检波器在东濮凹陷的采集效果分析

Acquisition effect analysis of the 3C digital geophone used in depression.Li Jidong, Liu Binhui, Zhao Xinguo,Zhang Guangbin and Zeng Zhaorong.

1. 中国地质大学,北京100083;2. 中国石油化工股份有限公司中原油田分公司勘探开发科学研究院,河南璞阳457001

China University of Geoscienees,Beijing 100083,China

数字检波器较之模拟检波器有更好的振幅和频率响应特征,更大的动态范围,更强的抗干扰能力。为了充分了解三分量数字检波器的性能和采集效果,在东濮凹陷马厂地区进行了多波地震勘探试验。采用MEMS三分量数字检波器采集了3条二维地震测线数据,同时在数字检波器相同的位置用12个一组的模拟检波器采集了1条二维地震测线数据。对两种检波器单炮记录进行了对比分析,结果表明数字检波器的Z分量单炮记录比模拟检波器具有更高的分辨率和信噪比；X分量和Y分量浅、中层的信噪比高,背景清楚。对两种检波器的叠加剖面进行了对比分析,结果表明数字检波器Z分量的叠加效果更好,剖面的分辨率和信噪比更高；X分量和Y分量的叠加剖面对地层尖灭、不整合和微幅度构造等地质特征反映清晰。对三分量数据进行了振幅比和泊松比分析,低异常区与钻井揭示的油气显示有很好的对应关系。

By contrast with simulative geophone,the digital geophone has a better response characteristic in amplitude and frequency,a larger dynamic range,and a stronger anti-interference ability.In order to know the performance and the acquisition effect of the 3C digital geophone,multi-wave seismic prospecting experiment was carried out in Machang area,Dongpu depression.Data on three 2-D seismic lines was collected through the MEMS digital geophone. At the same place,data on one 2-D seismic line was collected sim-ultaneously through twelve simulative geophones in one group. The single shot record of the two kinds of geophone are compared and analyzed,showing that the Z-component of digital geophone has a higher resolution and S/N ratio than that of simulative geo-phone and the X-component as well as the Y-component has a high S/N ratio and clear background for shallow and mid-depth layers. The stack sections of the two geophones are compared and ana-lyzed,indicating that 1) the Z-component of digital geophone has a better stack effect,a higher section resolution and S/N ratio,2) the stack sections of X-component and Y-component show us a clear geological characteristics including depositional termination, unconformity and micro-scope structures.All the three-component data are analyzed for amplitude ratio and Poisson ratio,showing that the low abnormal zone has a good corresponding relationship with oil & gas revealed by drilling.