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应用离散小波变换法对自然伽马曲线进行了信号分解并对各细节分量进行了频谱分析,确定了各细节分量的优势频率及沉积旋回厚度。根据沉积旋回厚度比例关系与天文周期比例关系之间的对应性,判断出与各天文周期相关的沉积旋回,并在绝对地质年龄约束下估算出各沉积旋回时限。延长组分析结果表明,据各细节分量划分的沉积旋回的时限均为对应天文周期的2倍,如以天文周期作为基准面旋回层序划分的依据,则每个沉积旋回可划分2个基准面旋回层序。该项研究成果表明,以天文周期为依据,以小波变换及频谱分析为手段,可以合理、有效地开展基准面旋回层序的划分与对比,在绝对地质年龄约束下进行地层定年。
The natural gamma curve was decomposed by discrete wavelet transform and the spectral components were analyzed. The dominant frequencies and depositional gyration thickness of each detail component were determined. According to the correspondence between the ratio of sedimentary cycles and the proportional relation of astronomical periods, the sedimentary cycle associated with each astronomical period is determined and the sedimentary cycle time is estimated under the constraint of absolute geologic age. The result of extension group analysis shows that the time limit of sedimentary cycles divided by each component is 2 times of the corresponding astronomical period. For example, if the astronomical period is used as the basis for the sequence division of the reference plane cycles, each sedimentary cycle can be divided into 2 datum planes Cyclical sequence. The research results show that, based on the astronomical cycle, wavelet transform and spectrum analysis can be used to carry out the division and contrast of the base-level cycle sequence reasonably and effectively, and the stratigraphic dating can be carried out under the constraint of absolute geologic age.