基于零通小波变换的测井层序地层自动划分研究

层序地层分析在地层学理论研究和石油勘探开发中有着重要的地位。不同级次层序界面的划分是层序地层分析的关键。测井资料作为地层岩性、物性的反映,其中必然蕴含了大量与沉积地层旋回变化有关的信息。以胜坨油田某井为例,利用零通小波对信号拐点的敏感性和多尺度分析特性,在不同尺度上定量划分出不同级别的地层层序界面,结果与传统方法所划分的界面基本一致。这些探索为地层层序的定量划分提供了一种新的思路。

Automatically Demarcating the Logging Sequence Stratigrephy by Using Zero-crossing Wavelet Transform

Analysis on sequence stratigraphy was very important in the academic study of stratigraphy and petroleum exploration. The principle used to grade different sequence boundary was the key to analyze sequence stratigraphy. Log data as the representations of lithology and physical properties embraced much information related to sedimentary cycles. For case study, logging curve from a well in Shengtuo Oilfield was processed by using the sensitivity of zero-crossing wavelet to the flex points of signals and the multi-scale analysis of the wavelet resolution. The sequence boundaries on different scales could be detected and it was in agreement with that obtained through the traditional method. All these researches provide a completely new method for the quantitative demarcation of sequence.