【摘要】 地震资料解释中时深转换是非常重要的环节,在古中央隆起带地区利用常规方法绘制的构造图误差比较大,为此提出了一种新的方法:因为钻至T₂反射层的井比较多,相对来说时深转换的速度比较准确,再把T₂至目的层的速度计算出来,就可以得到目的层以上的平均速度,这样就可以比较准确地完成时深转换,编制出更符合实际地质情况的构造图。依据以上方法,对古中央隆起带地区的T₅、T_4-1T₄、T_3-2、T（3-1a）、T_3-1、T₃反射层分别求取了至T₂反射层的层速度,再利用T₂反射层以上平均速度,从而得到了各目的反射层以上的平均速度,进行时深转换,编制出7个目的反射层的构造图。经过误差分析表明,利用这种方法编制的构造图的精度有了很大地提高。更多还原

【Abstract】 Time-depth conversion is very important link of seismic data interpretation.The error of drawn structural map by conventional method in palaeocentral uplift belt is rather serious,so the paper presents a new approach:for so many wells drilled through T₂ reflection formation and the velocity of time-depth conversion is pretty accurate to a certain degree, if the velocity from T₂ to target formation calculates,the average velocity above the target layer can be obtained and then much accurate time-depth conversion can be performed and furthermore the drawn structural map can well accord with actual geological conditions.According to the above means,the layer velocities from reflection interfaces T₅, T_4-1,T₄,T_3-2,T_3-1a,T_3-1,T₃ to T₂ are seperatively got in palaeo-central uplift belt and then with the help of the average velocity above reflection interface T2,the average velocities above each reflection interface can be gain and then time-depth conversion can be conduct easily and finally the structural maps of total 7 reflection interfaces can be compiled. Through error analysis,the accuracy of compiling structural map by this method is proven accurate to a great deal.更多还原