The genetic environmental transformation mechanism of coal and oil shale deposits in eastern China’s continental fault basins and the developmental characteristics of the area’s symbiotic assemblages—taking Huangxian Basin as an example
投稿时间:2018-04-20  
英文关键词:Coal and oil shale symbiotic assemblages, Genetic environments, Conversion mechanism, Sequence stratigraphic framework, Occurrence characteristics, Continental fault basin
基金项目:This work was supported by the National Key Research and Development Plan (2017YFC0601400), SDUST Research Fund (2018TDJH101), and the National Natural Science Foundation of China (41402086, 272172).
作者单位
Dong-Dong Wang College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
School of Geosciences, China University of Petroleum (East China), Qingdao 266580, Shandong, China 
Zeng-Xue Li College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 
Hai-Yan Liu College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 
Da-Wei Lyu College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 
Guo-Qi Dong College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 
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英文摘要:
      Coal and oil shale are two common sedimentary energy sources which are often symbiotically developed in Mesozoic– Cenozoic continental fault basins. However, the mechanisms and characteristics of the symbiotic development are not yet clearly known. In this research study, the typical continental fault basins of eastern China were chosen as examples for the purpose of conducting an examination of the coal and oil shale symbiotic assemblage types, genetic environmental differences, and transformation mechanisms, as well as the development and occurrence characteristics of different assemblage types. Through a large number of investigations, systematic experimental testing, and sequence stratigraphy studies, the following conclusions were obtained: (1) There were five types of coal and oil shale symbiotic assemblages observed in the continental fault basins, (2) The development of coal and oil shale deposits requires a warm and humid climate, stable structure, abundant organic matter supply, a certain water depth, and a lower terrestrial source debris supply. The observed differences were that the water depth conditions were diversified in the study area, as well as the sources, types, and content of the organic matter. (3) The rapid transformations of the coal and oil shale genetic environments were mainly controlled by the tectonic settings and climatic conditions, which were determined to control the changes in the water depths, salinity, redox conditions, and lake productivity of the genetic environments. Also, in the symbiotic assemblages, genetic environment changes had induced the development of oil shale deposits, which gradually evolved into coal genetic environments. (4) In the isochronous sequence stratigraphic framework of the coal and oil shale symbiotic assemblages, the lake expansion system tracts (EST) were determined to be the most beneficial to the growth of all the types of assemblages and were characterized by more assemblage development phases and smaller bed thicknesses. From the early to the late stages of the EST, and from the lakesides to lake centers, the thicknesses of the coal seams in the symbiotic assemblages showed trends of thinning, while the thicknesses of the oil shale deposits exhibited increasing trends. The early stages of high stand system tracts were found to be beneficial to the development of the symbiotic assemblages of coal seams overlying the oil shale. This tract type generally presented large bed thicknesses and distribution ranges. The low stand system tract and the late high stand system tract were determined to be unconducive to the development of the symbiotic assemblages.
Dong-Dong Wang,Zeng-Xue Li,Hai-Yan Liu,Da-Wei Lyu,Guo-Qi Dong,2019.The genetic environmental transformation mechanism of coal and oil shale deposits in eastern China’s continental fault basins and the developmental characteristics of the area’s symbiotic assemblages—taking Huangxian Basin as an example.Petroleum Science,(3):469~491.
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