Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin
A series of fault depressions developed in the Kailu area on the southwestern margin of the Songliao Basin, where thick lacustrine fine-grained sedimentary rocks were widely deposited during the initial faulting stage in the Early Cretaceous. These formations serve as the primary source rocks within...
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| author | Xuntao Yu Xiuli Fu Yunfeng Zhang Yunlong Fu Botao Huang Jiapeng Yuan Siyu Du |
| author_facet | Xuntao Yu Xiuli Fu Yunfeng Zhang Yunlong Fu Botao Huang Jiapeng Yuan Siyu Du |
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| description | A series of fault depressions developed in the Kailu area on the southwestern margin of the Songliao Basin, where thick lacustrine fine-grained sedimentary rocks were widely deposited during the initial faulting stage in the Early Cretaceous. These formations serve as the primary source rocks within the depressions. To investigate the depositional cyclicity framework, paleoenvironmental conditions, and source rock development patterns of fine-grained sedimentary strata, this study focuses on the Naiman Sag, selecting Well Nai-10 for wavelet transform and spectral analysis based on natural gamma ray logs. Combining core, well logging, and geochemical element analyses, Milankovitch cycles within the Yixian Formation were identified. The relationship between theoretical orbital periods and sedimentary cycles in a single well was established, enabling the high-precision identification and classification of fine-grained sedimentary cycles. Furthermore, the study explores the sedimentary response to orbital forcing and the development patterns of source rocks. The results indicate that fine-grained sedimentary strata exhibit distinct Milankovitch cyclicity, with a strong correlation between astronomical periods and sedimentary cycles. Using the 100 kyr short eccentricity cycle as the tuning curve, an astronomical timescale and high-frequency cyclic division for the target interval were established. Under the control of long eccentricity cycles, sedimentation exhibits strong response characteristics: near the peak of short eccentricity cycles, the climate was warm and humid, redox conditions were strong, and precipitation was high, facilitating organic matter accumulation. Based on this response relationship, two ideal enrichment models of mudstone and shale under different paleoclimatic conditions are proposed, providing valuable insights for identifying high-quality source rocks and unconventional hydrocarbons in hydrocarbon exploration. |
| format | Article |
| id | doaj-art-20eff483f0d140448dc05172e040fb7f |
| institution | OA Journals |
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| language | English |
| publishDate | 2025-05-01 |
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| series | Applied Sciences |
| spelling | doaj-art-20eff483f0d140448dc05172e040fb7f2025-08-20T02:33:39ZengMDPI AGApplied Sciences2076-34172025-05-011510574710.3390/app15105747Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao BasinXuntao Yu0Xiuli Fu1Yunfeng Zhang2Yunlong Fu3Botao Huang4Jiapeng Yuan5Siyu Du6School of Earth Sciences, Northeast Petroleum University, Daqing 163318, ChinaNational Key Laboratory for Multi-Resources Collaborative Green Production of Continental Shale Oil, Daqing 163712, ChinaSchool of Earth Sciences, Northeast Petroleum University, Daqing 163318, ChinaThe Development Department of Daqing Oilfield Co., Ltd., Daqing 163458, ChinaSchool of Earth Sciences, Northeast Petroleum University, Daqing 163318, ChinaSchool of Earth Sciences, Northeast Petroleum University, Daqing 163318, ChinaThe Development Department of Daqing Oilfield Co., Ltd., Daqing 163458, ChinaA series of fault depressions developed in the Kailu area on the southwestern margin of the Songliao Basin, where thick lacustrine fine-grained sedimentary rocks were widely deposited during the initial faulting stage in the Early Cretaceous. These formations serve as the primary source rocks within the depressions. To investigate the depositional cyclicity framework, paleoenvironmental conditions, and source rock development patterns of fine-grained sedimentary strata, this study focuses on the Naiman Sag, selecting Well Nai-10 for wavelet transform and spectral analysis based on natural gamma ray logs. Combining core, well logging, and geochemical element analyses, Milankovitch cycles within the Yixian Formation were identified. The relationship between theoretical orbital periods and sedimentary cycles in a single well was established, enabling the high-precision identification and classification of fine-grained sedimentary cycles. Furthermore, the study explores the sedimentary response to orbital forcing and the development patterns of source rocks. The results indicate that fine-grained sedimentary strata exhibit distinct Milankovitch cyclicity, with a strong correlation between astronomical periods and sedimentary cycles. Using the 100 kyr short eccentricity cycle as the tuning curve, an astronomical timescale and high-frequency cyclic division for the target interval were established. Under the control of long eccentricity cycles, sedimentation exhibits strong response characteristics: near the peak of short eccentricity cycles, the climate was warm and humid, redox conditions were strong, and precipitation was high, facilitating organic matter accumulation. Based on this response relationship, two ideal enrichment models of mudstone and shale under different paleoclimatic conditions are proposed, providing valuable insights for identifying high-quality source rocks and unconventional hydrocarbons in hydrocarbon exploration.https://www.mdpi.com/2076-3417/15/10/5747Songliao Basinsource rockfine-grained sedimentary strataMilankovitch cyclessedimentary response |
| spellingShingle | Xuntao Yu Xiuli Fu Yunfeng Zhang Yunlong Fu Botao Huang Jiapeng Yuan Siyu Du Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin Applied Sciences Songliao Basin source rock fine-grained sedimentary strata Milankovitch cycles sedimentary response |
| title | Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin |
| title_full | Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin |
| title_fullStr | Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin |
| title_full_unstemmed | Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin |
| title_short | Identification of Milankovitch Cycles and Their Sedimentary Responses in Fine-Grained Depositional Strata on the Southwestern Margin of the Songliao Basin |
| title_sort | identification of milankovitch cycles and their sedimentary responses in fine grained depositional strata on the southwestern margin of the songliao basin |
| topic | Songliao Basin source rock fine-grained sedimentary strata Milankovitch cycles sedimentary response |
| url | https://www.mdpi.com/2076-3417/15/10/5747 |
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