地层缺失

原型盆地剥蚀量计算的传统方法较多，但因方法的前提条件和数据的取得均受到了较多限制，所以难以真实反映地层缺失的原因。

There are plenty of traditional methods to calculate denuded amount of Prototype Basin , but the results of these methods can hardly reflect the real reason of lacuna .

地层缺失和厚度不等是基于测井数据进行井间地层自动对比中需要解决的关键问题。

Hiatus and different thickness of the same formation are two key problems on automatic stratigraphic correlation based on log data from well to well .

而符合南海地区准平原化阶段的时代是在中中新世末至晚中新世（N12/N13）之间，在此时段普遍存在区域构造不整合接触和地层缺失、断裂、变形及火山活动等构造变动事件。

From middle Miocene to late Miocene there is a stage of peneplanation in the South China Sea and there are many tectonic events in this area , such as stratum unconformable contact , faults , deformation and magmatism .

根据特定地层中现存和缺失的化石可以近似的估计年代。

Particular strata of rocks can be approximately dated according to the presence or absence of certain fossils .

根据所编程序进行的试算结果表明，对比井中地层的深度差异或对比井之一的地层缺失，均能获得比较可靠的对比结果，初步证明该方法用于地层对比是可行的。

The computation shows that valid results can be obtained in the correlated wells with different depth of stratum or stratigraphic break . It is proved that this method is available for stratigraphic correlation .

该旋回在本区的表现为NW向的挤压作用，形成了中二叠统地层的北东向褶皱和断裂，由于伴随褶皱的垂向抬升作用，导致了三叠系地层的缺失。

As a result , this compression lead to the middle permian strata ' folds and faults in the north-east trending . As the effect of fold vertical lifting , the triassic strata lost . 2 .