基于米兰科维奇理论的高精度旋回识别与划分——以南图尔盖盆地Ary301井中侏罗统为例

发布时间：2018-05-27 13:36

本文选题：南图尔盖盆地 + 米氏旋回　；参考：《沉积学报》2017年03期

【摘要】：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。
[Abstract]:The astronomical orbit period is connected with the cycles of different levels in order to bring Milankovich period, a high precision time scale, into the high frequency sequence stratigraphic division, and to realize the recognition and division of high precision cycles. Taking Aryskum graben Ary301 well in South Turgai Basin of Kazakhstan as an example, based on different sedimentary characteristics, spectrum analysis and continuous wavelet transform of natural gamma logging data of I~IV section of Karagansi formation are carried out respectively. The results show that the well-preserved Milankovich cycle in sedimentary strata and the astronomical orbit period have obvious influence on the deposition process of Aryskum graben. The thickness of 39.5 m cycle is interpreted as being controlled by the long eccentricity period of 400 kyr. The thickness of the cycle is controlled by the short eccentricity period of 125 kyr and 95 kyr, respectively. After filtering and analyzing the long and short eccentricity periods, compared with the theoretical periodic curves of astronomical model, the floating astronomical age scale of Karaganser group was established. Taking the kyr eccentricity periodic filter curve of 400kyr ~ (-1) as the reference curve for dividing the medium and short term cycles, a total of 11.5 intermediate cycles and 47 short term cycles were identified, which provided a natural standard for the high frequency cycle division without the influence of human factors. It ensures the scientific nature and unity of the cycle division of the research area.
【作者单位】：页岩油气富集机理与有效开发国家重点实验室;中国地质大学(北京)能源学院;中国石油化工股份有限公司石油勘探开发研究院;
【分类号】：P534.52

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