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在简要介绍静校正处理中常用方法及其特点基础上,结合研究区的特点,本文提出了基于模型的静校正处理方法。根据该区近地表特点重新定义了沙丘底面(模型顶面),并与沙丘压实曲线结合建立了相对准确的近地表模型;针对区内微测井数据分布不均、折射层不稳定等问题,引入相对折射静校正方法,实现了对模型在复杂近地表变化区域的精度修正,保证了基准面校正的可靠性,并为后续地表一致性剩余静校正打下了良好基础。实际资料处理应用表明,此模型静校正方法可较好地适应复杂地表地区的静校正处理,提高低幅度构造的成像精度。
Based on the brief introduction of the common methods and their characteristics in the static correction processing and the characteristics of the research area, this paper presents a static correction method based on the model. According to the characteristics of the near surface of the area, the bottom surface of the dune (top of the model) is redefined and a relatively accurate near-surface model is established in combination with the compaction curve of the dune. In view of the uneven distribution of micro-well data and the instability of the refraction layer in the area , The method of relative refraction static correction is introduced to realize the accuracy correction of the model in the complex near-surface variation area, which ensures the reliability of the datum correction and lays a good foundation for the subsequent surface consistency residual statics correction. The actual data processing application shows that this model static correction method can well adapt to the static correction of complex surface areas and improve the imaging accuracy of low-amplitude structures.