| 基于测井频谱分析的松科二井登娄库组地层沉积速率研究 |
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| 引用本文：张浩东,邹长春,彭诚,杨玉卿.2022.基于测井频谱分析的松科二井登娄库组地层沉积速率研究[J].地球学报,43(5):654-664. |
| DOI：10.3975/cagsb.2022.061602 |
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| 基金项目:中国地质调查局地质调查专项(编号: 1212011301600);国家自然科学基金委重大项目专题(编号: 41790455-1);中央高校基本科研业务费专项资金资助项目(编号: 2652019003) |
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| 中文摘要:松辽盆地科学钻探工程松科二井获取了白垩纪陆相沉积资料, 其中连续、多参数、高分辨率的地球物理测井资料为研究松辽盆地地层的沉积速率变化规律提供了机会。本文利用GR、Th、K、Th/K多种测井数据, 采用天文旋回的方法来计算松科二井登娄库组地层的沉积速率, 并探讨影响地层沉积的主控因素。多种测井数据的频谱分析结果表明了登娄库组地层记录着米兰科维奇旋回信息, 这说明登娄库组沉积过程受天文轨道驱动力影响。Th测井数据对天文旋回信息的敏感性强, 综合考虑多种测井数据的测试结果获得了连续、相对准确的地层沉积速率。登娄库组地层沉积速率从下往上整体呈现为由高到低的趋势。 登二段至登三段时期地层沉积主要受盆地断陷活动控制, 地层整体具有高沉积速率特征, 最高达到 16.2 cm/ka。随后至登四段时期由于断陷活动逐渐减弱, 盆地向区域坳陷的构造格局转化, 登四段整体具有沉积速率较低的特征, 最低为5.9 cm/ka。该研究建立了松科二井登娄库组地层连续的沉积速率剖面, 为揭示松辽盆地由断陷活动过渡到坳陷活动的地质规律提供了测井证据。 |
| 中文关键词:松科二井 登娄库组 地球物理测井 沉积速率 天文旋回 |
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| A Study on the Sedimentation Rate of the Denglouku Formation from CCSD SK-2, Based on Logging Spectral Analysis |
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| Abstract:The SK-2 of China Continental Scientific Drilling Project (CCSD) in the Songliao Basin recorded the Cretaceous continental sedimentary data. The continuous, multi-parameter, high-resolution geophysical logging data provided an opportunity to study the variation in sedimentation rate in the Songliao Basin. In this study, we used GR, Th, K, and Th/K logging data to calculate the sedimentation rate using the astronomical cycle method and discussed the main controlling factors affecting sediment formation. Spectral analysis results of various logging data showed that the Denglouku Formation has recorded the information of the great Milankovitch cycle information, and the sedimentation process is affected by the driving force of the astronomical orbit. Th data are highly sensitive to astronomical period information, and comprehensively considering the results of various logging data, a continuous and relatively accurate sedimentation rate has been obtained. The sedimentation rate showed a trend from high to low with depth from bottom to top. Sedimentation of the second to third members of the Denglouku Formation was mainly controlled by the faulting activities of the basin, and the overall sedimentation rate was high, reaching a maximum of 16.2 cm/ka. From then on to the fourth member of the Denglouku Formation, the basin transformed into a regional depression structure owing to the gradual weakening of the rifting activity, and the formation had a low sedimentation rate; the lowest rate was 5.9 cm/ka. This study established a continuous sedimentation rate profile of the Denglouku Formation from CCSD SK-2, which provided logging evidence for revealing the geological law of the transition from rifting activity to depression activity in the Songliao Basin. |
| keywords:CCSD SK-2 Denglouku Formation geophysical logs sedimentation rate astronomical cycle |
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