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Development of Upwelling during the Sedimentary Period of the Organic-Rich Shales in the Wufeng and Longmaxi Formations of the Upper Yangtze Region and Its Impact on Organic Matter Enrichment

1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
2
College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China
3
Sinopec Southwest Oil and Gas Company, Chengdu 610016, China
4
PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China
5
PetroChina Logging Co., Ltd., Xi’an 710077, China
6
Sinopec Shanghai Offshore Oil & Gas Company, Shanghai 200120, China
7
PetroChina Dagang Oilfield Company, Tianjin 300280, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(4), 99; https://doi.org/10.3390/jmse7040099
Received: 3 March 2019 / Revised: 6 April 2019 / Accepted: 7 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Marine Mineral Resource Mining)
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PDF [14618 KB, uploaded 12 April 2019]
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Abstract

This study uses logging data, mineral component content, total organic carbon (TOC) content, and microscopic characteristics of the organic-rich shales in the Wufeng and Longmaxi Formations, as well as data reported by other researchers, to demonstrate that upwelling has played an important role in the organic matter enrichment. The results show that (1) the organic-rich shales of Well N211 in the Upper Yangtze region are located in the Wufeng Formation and the lower Longmaxi Formation, with a burial depth between 2308–2357 m. (2) The organic-rich shales are enriched in biogenic silica. (3) Based on paleogeographic location and characteristics of organisms, this study determines that upwelling occurred during the deposition of the organic-rich shales in the Wufeng and Longmaxi Formations, promoting the enrichment of organic matter in the shales. (4) The upwelling intensity gradually increased from the sedimentary period of the organic-rich shales in the mid-lower Wufeng Formation to the sedimentary period of the Guanyinqiao Member, and then decreased gradually from the sedimentary period of the Guanyinqiao Member to the sedimentary period of the organic-rich shales in the Longmaxi Formation, and leads to the different enrichment of organic matter in the vertical direction. The different developments of upwelling led to the coexistence of both high and low TOC contents in the Guanyinqiao Member along the vertical direction. View Full-Text
Keywords: the Upper Yangtze region; the Wufeng and Longmaxi Formations; organic-rich shales; silica characteristics; upwelling the Upper Yangtze region; the Wufeng and Longmaxi Formations; organic-rich shales; silica characteristics; upwelling
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Zhao, S.-Z.; Li, Y.; Min, H.-J.; Wang, T.; Nie, Z.; Zhao, Z.-Z.; Qi, J.-Z.; Wang, J.-C.; Wu, J.-P. Development of Upwelling during the Sedimentary Period of the Organic-Rich Shales in the Wufeng and Longmaxi Formations of the Upper Yangtze Region and Its Impact on Organic Matter Enrichment. J. Mar. Sci. Eng. 2019, 7, 99.

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