约束层析静校正技术在鄂尔多斯盆地N51井区的应用

Application of tomographic static correction technology in Loess Plateau area of well N51

我国西北黄土塬地区表层覆盖巨厚黄土,地表起伏剧烈,高差较大,地震采集资料静校正问题比较突出,是地震资料处理的主要难点.鄂尔多斯盆地N51井区潜水面普遍较深,常规模型静校正、折射波静校正方法应用受多种因素限制,还不能满足该区地震资料对静校正的需求,而层析反演静校正方法在该区具有广泛的适用性,是解决静校正问题的有效方法,但层析方法多解性较为突出.本文通过采用基于语义分割的初至波自动拾取技术、微测井信息约束近地表模型层析反演技术、基准面静校正和初至剩余静校正联合计算技术,配与精细参数对比选择及质控,建立了一套适合于黄土塬山地的微测井约束层析静校正处理流程和方法.该方法在N51井区地震资料处理中取得了较好的效果,资料品质得到了显著的提升,为黄土塬区地震资料静校正问题解决提供了参考.

The surface of Loess Plateau in Northwest China is covered with huge thickness of loess, with severe surface fluctuation and large elevation difference. The problem of static correction of seismic acquisition data is prominent, which is the main difficulty of seismic data processing. The phreatic surface in well N51 area of Ordos Basin is generally deep, the application effect of conventional model static correction and refraction static correction methods is poor, and the tomographic inversion static correction method has wide applicability in this area, It is an effective method to solve the problem of static correction, but the multi solution of tomography method is more prominent. In this paper, by using the automatic pickup technology of first break based on semantic segmentation, the tomography inversion technology of near surface model constrained by micro logging information, and the joint calculation technology of datum static correction and first break residual static correction, combined with the comparison and selection of fine parameters and quality control, A set of processing flow and method of micro logging constrained tomography static correction suitable for loess plateau mountain area are established. This method has achieved good results in seismic data processing in well N51 area, and the data quality has been significantly improved, which provides a reference for solving the problem of seismic data static correction in Loess Plateau area.