中文摘要：

中国东部某油田X油层为近岸水下扇及扇三角洲砾石质沉积,沉积旋回性较差,给高分辨率层序地层学分析带来较大难度.以声波时差曲线资料为基础,应用Morlet一维连续性小波变换分析其所包含的旋回信息,由其获得的小波系数曲线具有良好的旋回性,并且与基准面旋回有较好的相关性.通过小波系数曲线识别的旋回称为小波旋回,统计小波旋回的数量及厚度,应用Fischer图解分析X油层长期基准面旋回的变化.研究表明,X油层由两期长期基准面旋回组成,即仅包含下降半旋回的不对称旋回和仅包含上升半旋回的不对称旋回.结合取心井的长期基准面旋回识别可知该方法识别的长期基准面旋回与由岩心识别的结果有着较好的一致性.在高分辨率层序地层对比中,可先通过Morlet小波一维连续性变换结合Fischer图解分析剖面内多井的长期基准面旋回变化,即识别异旋回变化,并通过Fischer图解异常井识别剖面中的异常处,分析自旋回变化对异旋回的干扰作用,从而辅助区域高分辨率层序地层的对比.

英文摘要：

The X Formation of a certain oilfield is a conglomerate reservoir of nearshore submerged fan and fan delta in East China, and its cyclicity is hardly recognized by logs. Based on the sonic logging data, one dimensional continuous Morlet wavelet transform is applied to analyze the cycle information of logs. The wavelet coefficient curve which is obtained by one dimensional continuous Morlet wavelet transform has good cyclicity, and it also has good correlation with base-level cycles. The cycle recognized by the wavelet coefficient curve is called the wavelet cycle. The numbers and thicknesses of the wavelet cycles are counted, and the Fischer plot is applied to analyze the changes of the long-term base-level cycles of the X Formation. The results show that the X Formation is divided into two long-term base-level cycles with this method. It includes one ascending hemicycle and one descending hemicycle. The long-term base-level cycle obtained by this method is the same as which obtained by the core well. The method can be also used in the high-resolution sequence stratigraphic correlation, and one dimensional continuous Morlet wavelet transform combining with Fischer plot is applied to analyze the long-term base-level cycle which also can be called the allo-eycle. And then the abnormity can be recognized by the differences of the Fischer plot. It can be used to analyze the interruption of auto-cycle on the allo-cyele, and then help high resolution sequence stratigraphic correlation of the X Formation.