LT区低信噪比地震资料现场处理方法

针对LOTUS区块的地震资料,研究了复杂地表区低信噪比地震资料现场处理的方法。在大量的试验和分析的基础上,采用高程静校正与折射静校正相结合的方法,有效解决了因地表起伏大、低降带速度和厚度剧烈变化引起的野外静校正问题。对于面波、低频干扰,规则线性干扰等造成的地震资料信噪比降低进行了针对性的压制和消弱。采用地表一致性反褶积技术基本解决了因激发和接收条件引起的不同炮集记录上的地震波属性的变化。总结了一套适合该区地震资料现场处理的方法和流程。

IN-SITU PROCESSING OF LOW SIGNAL/NOISE RATIO SEISMIC DATA FROM THE LOTUS BLOCK

In this paper, the problems of static correction and low signal/noise ratio in the complex surface seismic data were analyzed and studied on the basis of large quantities of experiments and analyses. The method in which the datum static correction is combined with the refraction static correction was adopted for effectively solving the problem of field static correction caused by the complex surface and low velocity layer. Such factors as surface wave, low-frequency disturbance and regular linear disturbance resulting in low signal/noise ratio of the seismic data were successfully suppressed. The difference in the wavelet of shots was solved effectively with the surface consistency deconvolution technique.