摘要
川西地区近表层结构复杂,存在较严重的长波长静校正问题。折射静校正、折射层析静校正、初至时间层析静校正由于其使用的模型较简单或反演结果不稳定等原因,不能很好地解决该地区的静校正问题。为此,将非线性层析静校正方法用于川西地区地震资料的处理中。影响非线性层析效果的因素较多,采用以下措施来保证非线性层析静校正质量：①通过自动拾取、交互修改和质量控制等手段提高初至时间的拾取质量；②用延迟时方法联合表层调查资料建立较合理的初始模型；③用道间距作为网格单元的尺寸；④在反演中使用梯度项和光滑项进行约束。反演后的结果与实际情况吻合,单炮记录的质量得到了较大的改进,消除了叠加剖面中层位错断现象,资料品质得到较大的提高。
The problem of statics is serious in Chuanxi area. Refraction statics,refraction tomography statics and first arrival tomography statics cannot produce a good solution to the complex statics problem due to simple model or in- version instability.There are many factors influencing the effect of nonlinear tomography.Applying automatic pick- ing,interactive modification and quality control etc.To improve the quality of first arrival picking;using delay- time method and surface survey data to build reasonable initial model;using group spacing as grid cell size,inclu- ding gradient and smoothing condition measures can im- prove the quality of nonlinear tomography.The nonlinear tomography statics was applied in data processing in Chuanxi,the inversion result was consistent with the real condition,the quality of shot gather was improved,the phenomenon of phase distortion in stacking section was e- liminated,the quality of stacking section was improved greatly.
出处
《石油物探》
EI
CSCD
2006年第1期88-92,7,共5页
Geophysical Prospecting For Petroleum
关键词
初至
折射
非线性层析
静校正
资料处理
first arrival
refraction
nonlinear tomography
static correction
data processing
