速度控制点法在川东高陡构造时深转换中的应用

时深转换是将地震数据从时间域信号转变为深度域信号的一个必要处理步骤,是利用地震资料进行油气构造解释的一个非常关键的环节.而时深转换处理的效果,主要取决于所建立的时深转换速度模型的正确及合理性.在研究分析了川东高陡构造的地质与地球物理特征的基础上,提出了使用速度控制点法进行建模,即利用地震反射层作为速度模型控制层,用大断层两端的断点做控制点的方法进行层速度模型的建立,有效地克服了以往时深转换带来的地震成像的畸变影响.

The application of the modeling method of velocity-controlling points to time-depth conversion in east Sichuan

The time-depth conversion,that converts the seismic data from the time domain to the depth domain,is a very important step in seismic processing,and it is the key to do seismic interpretation which indicates the oil and gas structures successfully.But the result of time-depth conversion depends on the accuracy and veracity of the velocity model building.After researching the geological characteristics and geophysical characteristics of the highly-steep structure in east Sichuan,the modeling method of velocity-controlling points is suggested,which uses the seismic reflective layers to be the velocity model controlling layers and uses the fault pointsoin both sides of the large fault to be the controlling points.It achieves great effect on improving the seismic mapping by this method.