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Global Geology 2020, 23(1) 38-70 DOI:
10.3969/j.issn.1673-9736.2020.01.05 ISSN: 1673-9736 CN: 22-1371/P |
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| 论文 |
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Lacustrine high resolution sequence records from UpperCretaceous Nenjiang Formation in Songliao Basin |
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GAO Youfeng1,2, JIAO Yuhui3, WANG Pujun1,3, CHENG Rihui1,3, WANG Guodong4 |
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1. Key Lab for the Evolution of Past Life and Environment in Northeast Asia, Ministry of Education, Jilin University, Changchun 130026, China;
2. Research Center of Palaeontology&Stratigraphy, Jilin University, Changchun 130026, China;
3. College of Earth Sciences, Jilin University, Changchun 130061, China;
4. Research Institute of Petroleum Exploration&Development-Northwest, PetroChina, Lanzhou 730020, China |
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摘要：
The Nenjiang Formation was continuously cored in the SK-1 borehole (China Cretaceous Continental Scientific Drilling Project-SongKe1well). Over 95.7% recovery rate, the obtained continuous core is 827.6 m in length, covering the geological age ranges from late Santonian to middle Campanian. This is the most complete and continuous sedimentary deposits in the Songliao basin till now. Here we systematically presented the lithological results of the observation of the cores in 2-5 cm thickness scale at the drilling spot, and the analysis on lithofacies and sedimentary sequence, cyclic stratigraphy. 13 types of sedimentary rocks deposited mainly in lacustrine, delta and fluvial environments were found in the Nenjiang Fromation, and they were subdivided into 19 microfacies including dolomite, marl, argillaceous limestone, turbidite, mudstone of still water, volcanic ash, channel-lag deposit, point bar, natural levee, crevasse splay, crevasse channel, floodplain, flood lake, distributary mouth bar, subaqueous distributary channels, subaqueous natural levee, subaqueous inter-distributary bay, distal bar and adjacent shore sand bar. The whole sedimentary column is composed of 630 sixth-order depositional cycles in the meter-scale, which can be further organized in 148 fifth-order depositional cycles, 38 fourth-order depositional cycles and 5 third-order depositional cycles. Meticulous depiction (centimeter level) of the whole Formation provides an approach to study its sedimentary process with high precision. The centimeter-scale description of the sequent core presented some previously unidentified dolomite and volcanic ash layers. The cyclostratigraphy of the Nenjiang Formation was controlled by Milankovitch cycled, which is helpful to discover the climatic changes of the late Santonian to the middle Campanian in Songliao Basin. In addition, the detailed description of the sequent section is significant for the upcoming oil and gas exploration in the Songliao Basin if regarding the new type of oil/gas systems. |
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关键词：
Upper Cretaceous
Songliao Basin
SK-1
lacustrine continuous sediments
sedimentary facies
stratigraphic cycles
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Lacustrine high resolution sequence records from UpperCretaceous Nenjiang Formation in Songliao Basin |
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GAO Youfeng1,2, JIAO Yuhui3, WANG Pujun1,3, CHENG Rihui1,3, WANG Guodong4 |
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1. Key Lab for the Evolution of Past Life and Environment in Northeast Asia, Ministry of Education, Jilin University, Changchun 130026, China;
2. Research Center of Palaeontology&Stratigraphy, Jilin University, Changchun 130026, China;
3. College of Earth Sciences, Jilin University, Changchun 130061, China;
4. Research Institute of Petroleum Exploration&Development-Northwest, PetroChina, Lanzhou 730020, China |
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Abstract:
The Nenjiang Formation was continuously cored in the SK-1 borehole (China Cretaceous Continental Scientific Drilling Project-SongKe1well). Over 95.7% recovery rate, the obtained continuous core is 827.6 m in length, covering the geological age ranges from late Santonian to middle Campanian. This is the most complete and continuous sedimentary deposits in the Songliao basin till now. Here we systematically presented the lithological results of the observation of the cores in 2-5 cm thickness scale at the drilling spot, and the analysis on lithofacies and sedimentary sequence, cyclic stratigraphy. 13 types of sedimentary rocks deposited mainly in lacustrine, delta and fluvial environments were found in the Nenjiang Fromation, and they were subdivided into 19 microfacies including dolomite, marl, argillaceous limestone, turbidite, mudstone of still water, volcanic ash, channel-lag deposit, point bar, natural levee, crevasse splay, crevasse channel, floodplain, flood lake, distributary mouth bar, subaqueous distributary channels, subaqueous natural levee, subaqueous inter-distributary bay, distal bar and adjacent shore sand bar. The whole sedimentary column is composed of 630 sixth-order depositional cycles in the meter-scale, which can be further organized in 148 fifth-order depositional cycles, 38 fourth-order depositional cycles and 5 third-order depositional cycles. Meticulous depiction (centimeter level) of the whole Formation provides an approach to study its sedimentary process with high precision. The centimeter-scale description of the sequent core presented some previously unidentified dolomite and volcanic ash layers. The cyclostratigraphy of the Nenjiang Formation was controlled by Milankovitch cycled, which is helpful to discover the climatic changes of the late Santonian to the middle Campanian in Songliao Basin. In addition, the detailed description of the sequent section is significant for the upcoming oil and gas exploration in the Songliao Basin if regarding the new type of oil/gas systems. |
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Keywords:
Upper Cretaceous
Songliao Basin
SK-1
lacustrine continuous sediments
sedimentary facies
stratigraphic cycles
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收稿日期 2019-09-11 修回日期 2019-10-15 网络版发布日期 |
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DOI: 10.3969/j.issn.1673-9736.2020.01.05 |
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基金项目:
Supported by projects of the National Key R&D Program of China (No. 2019YFC0605402) and National Natural Science Foundation of China (No. 41790453). |
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通讯作者: |
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作者简介: |
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| 参考文献： |
Cheng R H, Wang G D, Wang P J. 2008. Sedimentary cycles of Quantou-Nenjiang, Cretaceous and Milankovitch cycles from the south hole of CCSD-SK in Songliao basin. Acta Geologica Sinica, 82(1):55-64. (in Chinese with English abstract)
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Wang G D, Cheng R H, Wang P J, et al. 2008. The forming mechanism of dolostone of Nenjiang Formation in Songliao Basin-example from CCSD-SKII. Acta Geologica Sinica, 82(1):48-54. (in Chinese with English abstract)
Wang P J, Du X D, Wang J, et al. 1995. The chronostratigraphy and stratigraphic classification of the Cretaceous of the Songliao Basin. Acta Geologica Sinica, 69(4):372-381. (in Chinese with English abstract)
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Xi D P, Wan X Q, Feng Z Q, et al. 2011. Discovery of Late Cretaceous foraminifera in the Songliao Basin:Evidence from SK-1 and implications for identifying seawater incursions. Chinese Science Bulletin, 56(3):253-256.
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Ye D Q. 1991. The significance of the Cretaceous ostracoda biostratigraphy and magnetostratigraphy in Songliao Basin. Petroleum Geology & Oilfield Development in Daqing, 10(4):1-12. (in Chinese with English abstract) |
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