基于表层数据库模型约束的组合静校正技术

近地表时间问题严重困扰高分辨率地震资料处理质量,进而影响到基于高分辨率地震资料的精细构造解释、圈闭识别和储层物性研究,可见高精度静校正技术对微幅度构造油藏、岩性油气藏研究意义重大.以松辽盆地塔112三维地震工区高分辨率地震资料处理为例,研究出一种基于表层数据库模型约束的组合静校正技术,首先分析了地震资料处理中现有静校正技术的不足,阐述了应用微测井资料建立近地表模型的过程,剖析了初至折射波静校正在实际应用中造成其低频分量不准确的原因,给出了应用表层数据库模型静校正量低频成分与初至折射波静校正量高频成分组合来解决近地表时间问题的技术策略.该技术在塔112三维地震工区应用取得满意效果,与单纯使用初至折射波静校正技术相比,不仅消除了假构造现象,而且剖面叠加质量较高,有助于精细地质解释.

Combination static calibration technique based on surface database model restraint

Processing quality of seismic data with high resolution is disturbed by near surface time, abd thereby fine structure interpretation, trap identification and analysis of reservoir physical property are further affected. Thus, high accuracy has a significant meaning for analysis on micro-amplitude structural reservoir and lithology oil/gas reservoir. Taking Ta 112 seismic area in Songliao Basin as an example, a combination static calibration technique based on surface database model restraint is obtained. First, disadvantage of current static calibration technique is analyzed, the process of establishment of near surface model is introduced by using micro-log data, incorrect reason of low-frequency component resulted from first arrival refraction wave static calibration applied to practice is introduced. Then a kind of technical method used a combination of static calibration low-frequency of surface database model and first arrival refraction wave high-frequency is given. This technique gets good effect in Ta 112 seismic area, comparison with only used first arrival refraction wave static calibration technique not only removes false structure phenomenon but also has high quality of cross section superposition, improving fine geologic interpretation.