The Early Silurian Sedimentary Environment of Middle-Upper Yangtze: Lithological and Palaeontological Evidence and Impact on Shale Gas Reservoir
Abstract
:1. Introduction
2. Investigation and Methodology
3. Fossils and Lithological Characteristics
3.1. Hanzhong Uplift, North of the Upper Yangtze
3.2. Qianzhong Uplift, Upper Yangtze
3.3. Yichang Submarine Highland, Middle Yangtze
4. Distribution of Sedimentary Environments and Lithologies
4.1. Rhuddanian
4.2. Aeronian
5. Impact of Sedimentary Environment on the Longmaxi Shale Reservoir
5.1. Coupling of Dark Shale Development and Water Background
5.2. Sedimentary Environment Suitable for Dark Shale Development
5.3. Reservoiring Association Characteristics of the Longmaxi Formation
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Typical Profile | Lithofacies | Thickness (m) | TOC (%) | Brittle Index (%) | Porosity (%) | |
---|---|---|---|---|---|---|
Deep water shelf | Lower Qijiang (I) | Carbonaceous- siliceous | 35.7/35.7 # | 0.99–4.77 * 2.99(6) | 53.2–61.3 (2) | 2.45–3.69 2.98(3) |
Lower Shuanghe (II) | Carbonaceous- siliceous | 49.5/49.5 | 2.00–5.35 3.38(28) | 36.6–80.1 58.9(12) | 1.76–9.66 6.44(8) | |
Lower Yongshan (X) | Carbonaceous | >37.6/>37.6 | 0.94–2.52 1.59(16) | 37.3–77.9 58.2(16) | 2.21–10.81 7.73(3) | |
Lower WX2 (XIII) | argillaceous | 77.4/77.4 | 2.13–8.00 3.47(15) | 64.0–76.0 70.8(9) | 0.53–2.80 1.26(4) | |
Shallow water shelf | Upper Qijiang (I) | Carbonaceous- argillaceous | 23.6/101.6 | 0.27–1.05 0.79(8) | 44.6–52.2 (2) | 1.54–6.47 4.43(3) |
Upper Shuanghe (II) | Carbonaceous- argillaceous | 70.2/>91.3 | 0.29–2.00 1.11(47) | 27.3–46.4 36.7(27) | 1.71–4.28 2.85(8) | |
Upper WX2 (XIII) | Argillaceous- silty | >68.6/>71.4 | 0.06–1.52 0.38(8) | 66.0–67.0 66.3(3) | 0.7–3.47 1.50(8) | |
YY1 [45] | Argillaceous | 19.3/523.1 | 0.98–3.47 2.00(15) | 37.0–66.0 50.3(8) | 1.6–2.0 1.7(8) | |
Tidal flat | Upper Fenggang (IX) | Arenaceous- argillaceous | 32/128 | 0.13–0.41 0.27(9) | 30.5–66.18 44.3(4) | 1.31–3.77 2.78(4) |
Upper Yongshan (X) | Arenaceous- argillaceous | 23.4/181.3 | 0.5–1.15 0.66(6) | 48.9–70.6 63.0(6) | 1.62–7.49 4.53(4) |
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Qu, X.; Zhu, Y.; Wang, Y.; Shang, F. The Early Silurian Sedimentary Environment of Middle-Upper Yangtze: Lithological and Palaeontological Evidence and Impact on Shale Gas Reservoir. Minerals 2019, 9, 494. https://doi.org/10.3390/min9080494
Qu X, Zhu Y, Wang Y, Shang F. The Early Silurian Sedimentary Environment of Middle-Upper Yangtze: Lithological and Palaeontological Evidence and Impact on Shale Gas Reservoir. Minerals. 2019; 9(8):494. https://doi.org/10.3390/min9080494
Chicago/Turabian StyleQu, Xiaorong, Yanming Zhu, Yang Wang, and Fuhua Shang. 2019. "The Early Silurian Sedimentary Environment of Middle-Upper Yangtze: Lithological and Palaeontological Evidence and Impact on Shale Gas Reservoir" Minerals 9, no. 8: 494. https://doi.org/10.3390/min9080494