| 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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| 关键词:CCSD SK-2 Denglouku Formation geophysical logs sedimentation rate astronomical cycle |
| 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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| 摘要: |
| A Study on the Sedimentation Rate of the Denglouku Formation from CCSD SK-2, Based on Logging Spectral Analysis |
| 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. |
| ZHANG Hao-dong,ZOU Chang-chun,PENG Cheng,YANG Yu-qing.2022.A Study on the Sedimentation Rate of the Denglouku Formation from CCSD SK-2, Based on Logging Spectral Analysis[J].Acta Geoscientica Sinica,43(5):654-664. |
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