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Sedimentary Environment and Genesis of Organic Matter Enrichment of Late Ordovician-Early Silurian Black Shale in the Fore Deep Zone, the Southwestern Lower Yangtze Basin, China—A Case Study of Well WDD1(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第02期
Page:
312-326
Research Field:
沉积地质与油气勘探
Publishing date:

Info

Title:
Sedimentary Environment and Genesis of Organic Matter Enrichment of Late Ordovician-Early Silurian Black Shale in the Fore Deep Zone, the Southwestern Lower Yangtze Basin, China—A Case Study of Well WDD1
Author(s):
FANG Chao-gang1; 2; 3;  ZHANG Cheng-cheng1*;  LIN Hong4;  HAN Jin2;  TENG Long1;  ZHOU Dao-rong1;  LI Jian-qing1
(1. Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China; 2. School of Earth Sciences, Yunnan University, Kunming 650091, Yunnan, China; 3. Hubei Key Laboratory of Paleontology and Geological Environment Evolution, Wuhan 430205, Hubei, China; 4. Institute of Geological Sciences of Jiangxi Province, Nanchang 330052, Jiangxi, China)
Keywords:
black shale;  sedimentary environment;  Wufeng Formation;  Gaojiabian Formation;  organic matter enrichment;  chemical index of alteration;  paleoproductivity;  Lower Yangtze region
PACS:
P588.2; P595
DOI:
10.19814/j.jese.2021.10022
Abstract:
Lithofacies paleogeography shows that a set of black shale in the foreland basin front zone is mainly developed in the Lower Yangtze region at the turn of Ordovician-Silurian, and the Lower Yangtze region is obviously different with the Middle and Upper Yangtze regions. The study on the sedimentary environment evolution of the black shale is relatively weak, especially the related study on organic matter enrichment. Therefore, it is necessary to clarify the sedimentary environment and organic matter enrichment mechanism of Wufeng Formation-Gaojiabian Formation shale in the Lower Yangtze region, which is of great significance for deepening the understanding of shale gas enrichment law. Based on the continuous underground core data obtained by the latest shale gas geological survey well(WDD1)in the southwest of the Lower Yangtze region, 38 core samples were tested for organic carbon, major and trace elements. The vertical variation characteristics of major and trace elements in the profile and their relationship with the sedimentary environment of the basin were analyzed. The main controlling factors of organic matter enrichment of Ordovician-Silurian shale in the southwest of the Lower Yangtze region were discussed. The results show that Wufeng Formation and the second member of Gaojiabian Formation are enriched in organic matter, and the CIAcorr value indicates that the climate of Jiangnan transitional zone is relatively warm and humid at the turn of Ordovician-Silurian. Contents of Babio, Cu, Zn and other indicators confirm Wufeng-Gaojiabian deposition period has a high level of paleoproductivity; V/Cr, V/(V+Ni)and V/Sc values reveal that the bottom water of Wufeng Formation during the deposition period is an anaerobic sulfide state, and the bottom water of the first member of Gaojiabian Formation during the deposition period is converted into an oxygen-poor oxidation state. Diagram of Mo-TOC and covariation diagram of EFMo-EFU show that Wufeng deposition period is medium-retention sedimentary environment, and Gaojiabian deposition period is medium-weak retention sedimentary environment. TOC shows a weak positive correlation with contents of Al and Ti in Wufeng deposition period, while it turns into a negative correlation in Gaojiabian deposition period. The enrichment mechanism of organic matter in black shale of Wufeng Formation and Gaojiabian Formation is different. The main controlling factor of organic matter enrichment in black shale of Wufeng Formation is the semi-retention environment of reduction-sulfidation, and the nutrients brought by terrigenous clastic input promote to some extent. The differences in the enrichment mechanism between Wufeng Formation and Gaojiabian Formation show that the paleo-ocean environment in the Lower Yangtze region has undergone significant changes at the turn of Ordovician-Silurian.

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Last Update: 2022-04-30