Sedimentary Mechanism in the Coal and Oil Shale Bearing Succession Graben Basins: The Comparision between Fushun and Huangxian Basins, Eastern China
Dawei Lv*, Xiaoyan Wu, Zengxue Li, Tingting Feng, Haiyan Liu, Dongdong Wang , Luyang Zhao
Identifiers and Pagination:Year: 2015
First Page: 385
Last Page: 391
Publisher Id: TOPEJ-8-385
Article History:Received Date: 14/1/2015
Revision Received Date: 15/5/2015
Acceptance Date: 7/7/2015
Electronic publication date: 10/9/2015
Collection year: 2015
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The association of coal and oil shale had been a hot topic for a long time. Various types of association of coal and oil shale can be found in one basin, for instance, the coal can act as the roof or floor or interlayer of the oil shale, etc. The most crucial factor for the formation of oil shale is stratification and seasonal blooming of lower plankton, while the final formation of the coal still need a hypoxia restored deposition environment. We take Huangxian and Fushun basins as typical examples to study the coal and oil shale sedimentary mechanisms controlled by the boundary fault. We found that the sedimentary mechanisms are different in different stages during the process of basin evolution. In the early stage, the association of coal and oil shale with thinner layers can be found. In the late part of early stage, thick layer coal seams and oil shale can be formed because of the relative stable faults. In the middle stage, thicker oil shale can be formed in deep lake and thicker coal seams can be formed in the lacustrine shore. In the late stage of basin evolution, the association of thickest coal seams and oil shale can be formed as the stable tectonic environment. Compared with the depression basin, more active fault and short cycle subsidence controlled by the episodic tectonic movements are the obvious characteristics. Higher rate of tectonic subsidence and a vast difference between sedimentary (peat-bearing) supply rate and accommodation space change rate are in favor of forming oil shale, and slower rate of tectonic subsidence is favor of forming coal. The study found that faulted structures obviously control the development, thickness and distribution characteristics of oil shale and coal. As mentioned the above, the episodic tectonic movement of continental rift basin controls the types and filling and evolution of deposits.