沙漠地区地震资料处理方法研究

Study of processing method for seismic data from desert

1. 中国地质大学,湖北武汉430074;2. 中国石化河南油田勘探开发研究院,河南南阳473132

1. China University of Geosciences, Wuhan 430074, China;2. Exploration and Development Research Institute of SINOPEC Henan Oilfield Company, Nanyang 473132, China

针对焉耆盆地南部沙山和塔中沙漠地区地表条件异常复杂,原始资料信噪比低,静校正问题突出的特点,首先在表层结构分析的基础上进行静校正方法的研究,采用两次浮动基准面、沙丘曲线法、折射静校正以及分偏移距地表一致性剩余静校正等技术,解决静校正问题;然后采用叠前多域去噪、优化迭代叠加、改进的f-x域预测去噪等技术,有效地提高了资料的信噪比和分辨率。

Serious static correction problem arose for the low signal to noise ratio (S/N) raw data acquired at the mountains of sands in Yanqi basin and at the desert in center of Tarim due to complex near surface structure. The static correction problem was resolved by twice floating datum, sand dune curve, static correction of refraction, and offset divided surface consistent residual static correction. The S/N and resolution of the resulting data was then improved by multi domain prestack noise suppression, optimal iterating stacking, improved f-x prediction denoising.