【摘要】 二连盆地内的凹陷窄而狭长,断裂发育,构造变化剧烈,速度横向变化快,常规作图方法难以满足精细构造解释的要求。采用叠前时间偏移后的叠加速度谱生成速度模型,并用井震标定速度进行校正,形成高精度的变速三维速度场,用它对地震层位作时深转换,较大地提高了构造成图的精度。更多还原

【Abstract】 Depressions in Erlian Basin are long and narrow with complex faults and structures.Challenges for correct structure mapping include complex structure imaging and sharply lateral variable velocity analysis.Traditional methods by using stack velocity spectrum do not meet the demands of high precision seismic interpretations.The improved structure mapping in this paper involves the following steps:(1) creating velocity model by stacking velocity spectrum based on seismic pre-stack time migration data;(2) calibration of the velocity model with well log and seismic data and building up a transversely variable 3D seismic velocity model;and (3) implementing time-depth conversion for target layers using the revised velocity model.Real seismic data processing in Erlian Basin shows that the transversely variable 3D seismic velocity model can be used to improve complex structure mapping.更多还原