论文部分内容阅读
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.
The X oil layer of a certain oilfield in east China is a submarine fan and fan delta of the nearshore, which is poor in sedimentary swirling, which brings great difficulty to high-resolution sequence stratigraphy analysis.According to the acoustic jet lag curve data, Morlet One-dimensional continuous wavelet transform is used to analyze the information contained in the rotation, and the wavelet coefficients obtained by the wavelet transform have good recoverability and good correlation with the reference plane cycles. The cycles identified by the wavelet coefficient curve are called wavelet cycles , The number and thickness of wavelet cycles were counted, and the Fischer diagram was used to analyze the long-term cycle changes in X. The study shows that the X interval consists of two long-term base-level cycles that include only the ascending and descending cycles, The asymmetric cycle of the semi-cycle shows that there is a good agreement between the long-term base-level cycles identified by this method and the core-identified results.Combining with the high-resolution sequence stratigraphy, Firstly, the long-term base-level cycle changes of multi-well in the section were analyzed by Morlet wavelet one-dimensional continuity transformation combined with Fischer diagram, that is, The anomalies in the profile were identified by the Fischer plot anomaly well, and the interference effect of the spin-cycle variation on the heterocyclone was analyzed to assist the comparison of high-resolution sequence stratigraphy in the region.