Sedimentary constraints on the tectonic evolution of Mianyang-Changning trough in the Sichuan Basin

被引：0
|
作者：
Li S. [1 ,2 ]
Gao P. [1 ,2 ]
Huang B. [3 ]
Wang H. [4 ]
Wo Y. [1 ,2 ]
机构：
[1] State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing
[2] Laboratory of Structural and Sedimentological Reservoir Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Beijing
[3] College of Geosciences, China University of Petroleum, Beijing
[4] Southwest Oil and Gas Branch of SINOPEC, Guiyang, 550001, Guizhou
来源：
Oil and Gas Geology | 2018年 / 39卷 / 05期
关键词：
Cambrian; Dengying Formation; Mianyang-Changning trough; Sedimentary record; Sichuan Basin; Sinian;
D O I：
10.11743/ogg20180504
中图分类号：
学科分类号：
摘要：
Mianyang-Changning trough is developed during the transitional period from the Sinian to Early Cambrian in Sichuan Basin.We systematically collected the outcrop samples and drilling data both inside and outside the trough and analyzed its tectonic evolution according to stratigraphic unconformity,lithological variation,log correlation and geochemical data.The results show that there are pronounced onlaps on the Lower Cambiran sequences in the trough,keeping the erosional unconformity between the Lower Cambrian and Sinian Dengying Formation intact.In addition,evidences of early stage karstification occur in the residual Dengying Formation,indicating that the trough has experienced exposure and erosion before the Cambrian sedimentation.Meanwhile,the sedimentary cycle correlation demonstrates that there is an additional sedimentary cycle in the Maidiping Formation with normal proportion of black rocks in the trough.Moreover,elemental logging in Well Ziyang-1 inside the trough shows that there are 20 m-thick siliceous argillaceous dolomites deve-loped in the lower part of the black rocks.Thus,in combination with the stratigraphic division based on drilling data in the adjacent areas,we believed that the black rocks within the trough include not only the Cambrian Maidiping Formation,but also the 3rd and 4th members of the Sinian Dengying Formation.Besides,the hydrothermal origin of siliceous rocks in the 4th member of the Dengying Formation proves that strong regional extension exists during that time.According to the Middle Neoproterozoic-Cambrian magmatic activity records and the characters of the Nanhua sedimentary strata,we considered that the Mianyang-Changning trough inherited from the persistent negative landforms on the basis of Nanhua rift,and it was formed under the combined effect of intermittent extensional subsidence and denudation from exposure.Therefore,the trough is an extensional-erosional trough in tectonics. © 2018, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：889 / 898
页数：9
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