稀疏井网条件下利用测井曲线识别层序界面方法探讨——以珠江口盆地珠江组为例

Methods for recognizing sequence boundaries by using logging curves in sparse well pattern:A case study from Zhujiang Formation in Pearl River Mouth Basin

层序界面的识别是层序地层学中的一个关键问题。通常识别层序界面的方法是应用岩心、地震、测井及古生物等资料进行综合判断。对于稀疏井网条件,由于地震资料分辨率以及钻井取心段的限制,充分挖掘并利用测井资料就成为解决层序划分与对比问题的关键。文中以珠江口盆地珠江组层序划分为例,采用自然伽马形态法、声波时差识别法和小波分析法等多种方法进行了层序界面的识别,总结出了稀疏井网条件下充分挖掘测井信息,进而划分层序界面的方法。

The recognition of sequence boundaries is a key problem in sequence stratigraphy.Core,seismic data,palaeontologic correlation and logging data are often applied to recognize sequence boundaries.In sparse well pattern,because of the limitation of seismic resolution and the length of the cores,a lot of logging data are needed in order to improve the recognition accuracy of sequence boundaries.On the basis of identifying the sequence boundaries of Zhujiang Formation in Pearl River Mouth Basin by different methods,such as shape of natural gamma-ray logging curves,acoustic travel timeand wavelet analysis,a method for recognizing the sequence boundaries by making full use ofwell logginginformation in sparse well pattern is put forward.