The main controlling factors and developmental models of Oligocene source rocks in the Qiongdongnan Basin, northern South China Sea

Coals developed in the Oligocene Yacheng and Lingshui formations in the Qiongdongnan Basin have high organic matter abundance, and the dark mudstones in the two formations have reached a good source rock standard but with strong heterogeneity. Through the analysis of trace elements, organic macerals...

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Bibliographic Details
Published in:Petroleum science 2013-06, Vol.10 (2), p.161-170
Main Authors: Li, Wenhao, Zhang, Zhihuan, Li, Youchuan, Liu, Chao, Fu, Ning
Format: Article
Language:English
Subjects:
Basins
Depression
Earth and Environmental Science
Earth Sciences
Economics and Management
Energy Policy
Fluid flow
Formations
Hydrodynamics
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Mathematical models
Mineral Resources
Preservation
Rocks
中央隆起带
主控因素
优质烃源岩
南海北部
有机质丰度
氧化还原环境
渐新统
琼东南盆地
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Summary:Coals developed in the Oligocene Yacheng and Lingshui formations in the Qiongdongnan Basin have high organic matter abundance, and the dark mudstones in the two formations have reached a good source rock standard but with strong heterogeneity. Through the analysis of trace elements, organic macerals and biomarkers, it is indicated that plankton has made little contribution to Oligocene source rocks compared with the terrestrial higher plants. The organic matter preservation depends on hydrodynamics and the redox environment, and the former is the major factor in the study area. During the sedimentary period of the Yacheng Formation, tidal flats were developed in the central uplift zone, where the hydrodynamic conditions were weak and the input of terrestrial organic matter was abundant. So the Yacheng Salient of the central uplift zone is the most favorable area for the development of source rocks, followed by the central depression zone. During the sedimentary period of the Lingshui Formation, the organic matter input was sufficient in the central depression zone due to multiple sources of sediments. The semi-enclosed environment was favorable for organic matter accumulation, so high quality source rocks could be easily formed in this area, followed by the Yacheng salient of central uplift zone. Source rocks were less developed in the northern depression zone owing to poor preservation conditions,
ISSN:1672-5107
1995-8226
DOI:10.1007/s12182-013-0263-8