Paleo-sedimentary environmental restoration and its significance of Chang 7 Member of Triassic Yanchang Formation in Ordos Basin, NW China

被引：0
|
作者：
Fu J. [1 ,2 ]
Li S. [1 ,2 ,3 ]
Xu L. [1 ,2 ,3 ]
Niu X. [1 ,2 ,3 ]
机构：
[1] National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an
[2] PetroChina Changqing Oilfield Company, Xi'an
[3] Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an
来源：
| 2018年 / Science Press卷 / 45期
关键词：
Chang; 7; Member; Element geochemistry; Ordos Basin; Paleo-climate; Paleo-redox conditions; Paleo-salinity; Paleo-sedimentary environment; Upper Triassic;
D O I：
10.11698/PED.2018.06.02
中图分类号：
学科分类号：
摘要：
Paleo-sedimentary environment of Chang 7 Member of Upper Triassic Yanchang Formation in Ordos Basin, including the paleoclimate, paleo-salinity and paleo-redox conditions were restored through geochemical element analysis of 289 samples collected from the outcrop sections around and wells drilled in the basin and using a series of identification indexes of paleo-climate, paleo-salinity and paleo-redox conditions, such as CaO/MgO∙Al2O3, Sr/Cu, Rb/Sr, Rb/K2O, Th/U, V/(V+Ni), the content of element B tested from the mudstone. Comprehensive analysis shows that in sedimentary period of the Chang 7, the paleo-climate was warm temperate to subtropical climate with temperature higher than 15℃, the water body was continental brackish water to freshwater, and the sediments were deposited under strong reduction conditions. Suitable temperature, extensively deep lake basin and strongly reductive paleo-sedimentary environment led to the blooming, enrichment and preservation of organic matter in the submember Chang 73. As a result, a set of high-quality source rock was formed, laying material foundation for large-scale accumulation of shale oil. © 2018, The Editorial Board of Petroleum Exploration and Development. All right reserved.
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页码：936 / 946
页数：10
相关论文
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