地层倾角测井资料在层序地层分析中的应用

APPLICATIONS OF DIP LOGGING DATA IN SEQUENCE STRATIGRAPHY

在前人工作的基础上提出了3种应用地层倾角资料识别层序界面的方法:倾角矢量图法、累积倾角交汇图法和累积水平位移交汇图法.在塔里木盆地TC1井使用这3种方法后的结果表明:用倾角矢量图法识别不整合面具有方便直观的优点,但其适用范围有局限性(不明显的不整合面不易识别);累积倾角交汇图法可以提高对倾角细微变化的分辨率,但在取样深度不均匀时容易产生假象;累积水平位移交汇图法弥补了累积倾角交汇图法的缺陷,但其适用条件仅限于倾角较小的情况.3种方法各有利弊,应根据实际情况选择使用.

Three methods of using dip logging data to recognize sequence boundaries have been developed in this paper, i.e. todpole plot, cumulative dip plot and cumulative horizontal displacement plot respectively. According to the application results of these methods in well TC1 in Tarim Basin, the todpole plot method is convenient and direct in identifying unconformity surfaces, but can not easily detect unclear surfaces. Although the cumulative dip plot method can improve resolution of fine dip variation, it will induce pseudomorph as sampling is not even in depth. The cumulative horizontal displacement plot method can make up the shortcoming of cumulative dip plot, but its applicability is limited to lower dip. Therefore, these methods should be selected to use on the basis of actual conditions.