一种提高地震层速度计算精度的方法——用于GeoMountain解释工程师系统

A method derived from the GeoMountain Seismic Interpreter System:To improve the accuracy of calculating seismic interval velocity

为提高利用速度谱资料获取地震层速度的准确性,以GeoMountain解释工程师软件系统作为平台,提出了一种新的层速度计算方法,包括区域经验值约束的广义DIX计算层速度、基于广义DIX公式的已知层速度的速度谱反推算法、层速度的沿层计算和方位平滑等新算法。经实际项目验证,用该方法计算的层速度用于时深转换成图,在平面上的变化具有更好的规律性,更加符合实际地质情况。

In order to get accurate calculation result of seismic interval velocity by use of velocity spectrum,this paper,taking the GeoMountain Seismic Interpreter System as a platform,puts forward a new calculation method of interval velocity including general DIX interval velocity calculation method restricted by regional empirical value,backstepping calculation method through the known interval velocity spectrum based on general DIX formula,horizon-based calculation method of interval velocity and azimuth smoothening etc.Examined by the actual structural map of Mopan-Laowan working area in East Sichuan basin,the interval velocity calculated by this method showed a better rule in lateral variation and coincided better with the actual geological conditions.