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将天文轨道周期与不同级别的旋回联系起来,旨在使米兰科维奇周期这一高精度时间标尺纳入高频层序地层划分中,实现高精度旋回的识别与划分。以哈萨克斯坦南图尔盖盆地Aryskum地堑Ary301井为例,基于不同沉积特征,分别对卡拉甘塞组I~IV段自然伽马测井数据进行频谱分析和连续小波变换,结果显示沉积地层中保存完好的米兰科维奇旋回,天文轨道周期对Aryskum地堑沉积过程具有明显影响,并将31.9~39.5 m旋回厚度解释为受400 kyr长偏心率周期控制,11.9~14.2 m,6.7~8.8 m旋回厚度分别受125 kyr和95 kyr短偏心率周期控制。对长、短偏心率周期进行滤波分析后,与天文模型理论周期曲线进行对比,建立卡拉甘塞组的浮动天文年代标尺,分别以400 kyr、125 kyr偏心率周期滤波曲线作为中期和短期旋回划分的参考曲线,共识别出11.5个中期旋回和47个短期旋回,为高频旋回划分提供了一种不受人为因素影响的天然标准,保证了研究区旋回划分的科学性和统一性。
The cycle of astronomical orbit associated with different levels of cycle, designed to make the Milanovic cycle of this high-precision time scale included in the high-frequency sequence stratigraphic division, to achieve high-precision cycle identification and segmentation. Taking the Ary301 well in the Aryskum graben in the South Turgai Basin, Kazakhstan as an example, the spectral analysis and continuous wavelet transform of the gamma ray logging data from I to IV in the Carragane Formation based on different sedimentary characteristics were carried out. The results show that in the sedimentary strata Well-preserved Milankovitch cycles and astronomical orbital periods have a significant effect on the Aryskum graben sedimentation process, and the 31.9-39.5 m cycle thickness is interpreted as being controlled by 400 kyr long eccentricity cycles, 11.9-14.2 m, 6.7-8.8 m The cyclotron thickness is controlled by a short eccentricity cycle of 125 kyr and 95 kyr, respectively. The long and short eccentric cycles are filtered and analyzed, and compared with the astronomical model theoretical cycle curve, the floating astronomical date scale of the Carragane plug is established. The periodic filtering curve with eccentricity of 400 kyr and 125 kyr respectively is used as the mid-term and short-term cycle , A total of 11.5 mid-term cycles and 47 short-term cycles are identified. This provides a natural standard that is not influenced by human factors and ensures the scientificness and unity of the cyclone division in the study area.