【摘要】 二连盆地赛汉塔拉凹陷地层横向速度变化大,在寻找低幅度构造,用常规速度量板进行地震时深转换,已无法满足高精度构造分析的需要。构造成图精度取决于反射时间的拾取精度和应用于时深转换的速度场精度。在二连盆地赛汉塔拉凹陷低幅度构造解释中,采用了波组闭合法在叠偏剖面上进行精细层位追踪,并采用变速构造成图方法即采用层位反偏移技术对零偏移距时间域T 0图进行空间偏移归位,进行逐层层速度反演与三维射线追踪时深转换构造成图。提高了低幅度构造成图精度,是寻找低幅度构造和高精度勾绘构造图的一种新方法。更多还原

【Abstract】 In Saihantala Hollow Erlian Basin the strata lateral velocity change greatly.The method of conventional time-to-depth conversion can’t attain the requirements of high-resolution structural analysis during low amplitude structure interpretation.The structure mapping precision depends on picking up reflection time correctly and getting accurate velocity field being used in time-to-depth conversion.During low amplitude structure interpretation in Saihantala Hollow Erlian Basin wave group closure method has been used to track horizons precisely in poststack migrated seismic sections and varying velocity mapping method has also been used which applied horizontal anti-shifting technique to make spatial shifting and homing of the nil shifting distance time domain T0 map and to make inversion of interval velocity to form the depth structural map.This improves structure-contour map precision.So it is a new method to find low amplitude structure and plot structure-contour map with high precision.更多还原