Fault linkage patterns and their control on the formation of the petroleum systems of the Erlian Basin, Eastern China |
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| Authors: | Lirong Dou Liang Chang |
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| Institution: | a Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;b Research Institute of Petroleum Exploration and Development, Huabei Petroleum Administration Bureau, Renqiu City, Hebei Province 062550, China |
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| Abstract: | Fault linkage patterns in rift basins are very common. While the process of fault linkage may be very short, it changes sedimentation patterns before and after linkage and controls the development of half-grabens. The propagation and growth of boundary faults can be divided into a simple fault propagation pattern and a fault growth-linkage pattern. Based on structural style, sedimentation patterns and oil-source correlations in the Erlian Basin, three types of grabens and petroleum systems can be identified. The Abei graben is controlled by a single boundary fault and forms an independent petroleum system. The Saihantala graben is controlled by several linked faults, which also has an independent petroleum system. The Wuliyasitai Depression controlled by two boundary fault segments which results in two petroleum systems. As not all half-grabens develop one petroleum system; they may, therefore, have two or more systems. The relay ramps between fault segments before linkage are the locations of deposition of sands and conglomerates, and consequently, are the focus areas for stratigraphic–lithologic trap exploration. |
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| Keywords: | Fault propagation Extensional tectonics Petroleum system Erlian basin |
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