Difference of mound-bank complex reservoir under different palaeogeographic environment of the Sinian Dengying Formation in Sichuan Basin |
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| Authors: | Xu Zhe-Hang Lan Cai-Jun Hao Fang Chen Hao-Ru Yang Wei-Qiang Ma Xiao-Lin Zou Hua-Yao |
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| Institution: | 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;2.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;3.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;4.Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;5.CNOOC Nanhai East Petroleum Bureau,Shenzhen 518067,China |
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| Abstract: | The mound-bank deposits of the Dengying Formation of the Sinian System are well developed in Sichuan Basin,with good reservoir value. Based on outcrop and core observation,thin section observation,porosity and permeability of samples test,we analyzed the reservoir quality of different mound-bank complexes. During the terminal of Sinian Period,development of the Mianyang-Changning rift affected distribution of sedimentary facies of the 2nd and the 4th Members of Dengying Formation,forming different palaeogeographic units. The high-energy environment,transition environment and low-energy environment of the mound-bank complex rock types are identified,and their reservoir quality is different. The keep-up platform margin mound-bank complex,which is represented by Hujiaba section in the 4th Member of the Dengying Formation mainly deposited high-energy zone rock types. The catch-up platform margin mound-bank complex,which is represented by Yangba section in the 2nd Member of the Dengying Formation,mainly deposited transform zone rock types. The give-up platform interior mound-bank complex,which is represented by Fucheng section in the 4th Member of the Dengying Formation mainly deposited low-energy zone rock types. By comparing reservoir characteristics of three types of mound-bank complex,it is found that the keep-up platform margin mound-bank complex is the‘Sweet spots’ of the Dengying Formation in the Sichuan Basin. The above studies are conducive to find the‘Sweet spots’ of the Sinian Dengying Formation in the Sichuan Basin. |
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| Keywords: | palaeogeographic environment mound-bank complex microbialite carbonate reservoir Sinian Dengying Formation Sichuan Basin |
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