塔西南厚黄土戈壁区地震资料静校正处理技术及应用

Seismic data static correction processing technology and application in thick loess Gobi area of southwest Tarim

静校正技术是复杂地表区地震资料地震成像的核心技术,塔里木盆地塔西南厚黄土戈壁区受低速层速度低、变化大,静校正问题突出,严重影响地震资料品质。在传统层析静校正技术的基础上,这里提出了改进的层析反演静校正处理技术,核心技术包括精确的初至拾取技术、分偏移距从浅到深逐步迭代的回转波层析反演技术、等速面静校正计算技术。通过这些技术的应用,提高了厚黄土戈壁区地震数据初至信息拾取的精度、近地表速度模型的精度和静校正计算量的精度。将改进的层析反演静校正处理技术,在塔西南厚黄土戈壁区的普东三维进行了实例应用,静校正问题得到了有效解决,地震成像质量得到显著改善。

Static correction technology is the core technology of seismic data imaging in complex surface area.Based on the traditional tomography static correction technology,we proposed an improved workflow of tomography static correction technology,including picking up precise first break,progressive tomographic inversion from shallow to deep,picking up isovelocity surface as datum surface for static correction,etc.We then applied the technology in the PD 3D area for practical application.Our results suggest that the problem of static correction has effectively resolved and the seismic image quality has improved.