四维叠前噪音压制技术在准南缘MQ1井区的应用

The 4D prestack noise suppression technology and its application in the MQ1 block of southern Junggar Basin

工区处于博格达山前地带上,地表及地下地质条件较为复杂,受地表因素、采集环境和地下复杂构造引起的线性干扰、随机噪音、面波、断面波等因素影响,地震资料信噪比很低。不同类型的噪声在不同频带宽度和不同域的表现特征均不相同。常规噪音压制手段对道集的信噪比提升幅度有限,不能满足后续速度分析等处理环节的要求。基于叠前分频多域去噪的原理,在常规噪音压制道集的基础上应用叠前四维噪音压制技术,大幅提高了叠前道集资料信噪比,为该区开展叠前深度偏移精细速度建模提供了高品质的基础资料,有效提高了叠前偏移成像效果。

The work area is in southern piedmont of the Bogda Mountains. The surface and underground geological conditions are complex. The signal-to-noise ratio of data are low under the influence of the linear interference, random noise, surface waves and section waves caused by surface factors, acquisition environment and underground complex structure. Different types of noise have different performance characteristics in different bandwidths and in different domains. The improvement in the signal-to-noise ratio of the gather is not obvious if the conventional noise suppression technologies are used. But it could not meet the requirements of the subsequent processing such as velocity analysis. Based on the principle of pre-stack multi-domain frequency division denoising, the pre-stack 4D noise suppression technology is applied to the gathers based on the conventional noise suppression process, the signal-to-noise ratio of pre-stack gather are improved greatly. The high-quality basic data is provided for the fine velocity modeling of the pre-stack depth migration in this area.