Effect of Sedimentary Facies Characteristics on Deep Shale Gas Desserts: A Case from the Longmaxi Formation, South Sichuan Basin, China
Abstract
:1. Introduction
2. Geological Background
2.1. Regional Tectonic Characteristics
2.2. Sedimentary Facies Model
3. Materials and Methods
4. Result
4.1. Sedimentary Facies Characteristics
4.1.1. Sedimentary Model
4.1.2. Types and Characteristics of Sedimentary Microfacies
4.2. Physical Properties and Pore Structure Characteristics
4.2.1. Physical Characteristics
4.2.2. Pore Structure
5. Discussion
5.1. Influence of Sedimentation on Reservoir Distribution
5.2. Influence of Sedimentary Microfacies on Mineral Composition of Reservoir
5.3. Influence of Sedimentary Microfacies on Pore Structure of High-Quality Reservoir
6. Conclusions
- (1)
- In the south of the Sichuan Basin, shore shelf sedimentary units developed successively from land to sea. In the early stage of the Longmaxi formation, it was located in the sedimentary facies zone of the offshore shelf with still water featuring an anoxic and reductive environment According to lithology, sedimentary structure, organic carbon content and mineral composition, six sedimentary microfacies can be divided, which are organic-rich siliceous mud shed microfacies, organic rich silty mud shed microfacies, deep water silty mud shed microfacies, shallow water silty mud shed microfacies, lime muddy silt shed microfacies and calcareous silty mud shed microfacies.
- (2)
- The shale porosity in the Changning area is mainly distributed in the range of 0.71–10.3%, with an average of 5%. The permeability ranges from 0.00016 × 10−3 μm2 to 9.9 × 10−3 μm2, with an average of 2.21 × 10−3 μm2. The organic matter content of the organic-rich siliceous shale and the organic rich silty shale is high, which provides the basis for organic pore development. The average porosity is more than 5%, and the permeability is more than 2 × 10−3 μm2; these two facies are the most favorable sedimentary facies for the formation of a high-quality shale gas reservoir.
- (3)
- Most of the silicalite in the shale is biogenetic and pores can be preserved between microcrystalline authigenic quartz grains, which provides storage space for organic matter migration. Organic matter is the material basis of shale gas formation, the higher the content of organic matter, the greater the hydrocarbon generation potential, and the higher the degree of pore development of organic matter. Silica and TOC content are positively correlated with porosity and specific surface area, while carbonate and clay mineral contents are negatively correlated with reservoir quality.
- (4)
- In the first member of the Longmaxi formation, the sedimentary water depth became shallower from bottom to top, and the sedimentary environment changed from a reduction to an oxidation environment. The contents of siliceous and organic matter decrease, while the contents of clay minerals and carbonate minerals show the opposite trend. The difference of sedimentary facies type essentially reflects different sedimentary provenance, which also determines the difference of mineral composition and the distribution of organic matter, and then controls the heterogeneity of the shale reservoir and the distribution of effective shale.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Formation | Depth/m | Porosity (%) | Permeability (mD) | Mineral Contensts (%) | Clay Mineral Contensts (%) | TOC (%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Quartz | Feldspar | Calcite | Dolomite | Pyrite | Clay mineral | Llite | I/S | Chlorite | Mixed-Layer Ratio | |||||
S1l1~1d | 2356.58 | 3.66 | 1.73 | 42.5 | 4.6 | 13.3 | 34.8 | 4.8 | 65 | 3 | 32 | 10 | 1.44 | |
S1l1~1d | 2345.97 | 2.63 | 0.204 | 45.7 | 11.9 | 13.1 | 2.8 | 26.5 | 55 | 45 | 1.45 | |||
S1l1~1d | 2307.75 | 4.93 | 1.54 | 47.9 | 8.5 | 10.1 | 2.3 | 31.2 | 71 | 29 | 1.47 | |||
S1l1~1d | 2363.65 | 3.88 | 0 | 44.7 | 12.4 | 8.0 | 3.3 | 2.6 | 29.0 | 69 | 31 | 1.63 | ||
S1l1~1d | 2365.40 | 4.66 | 0 | 47.7 | 7.5 | 9.1 | 4.2 | 0.7 | 30.8 | 70 | 1 | 29 | 10 | 1.95 |
S1l1~1d | 2364.55 | 5.26 | 0 | 64.6 | 7.6 | 4.7 | 23.1 | 68 | 32 | 1.96 | ||||
S1l1~1d | 2367.12 | 5.24 | 0 | 54.6 | 9.0 | 7.7 | 3.0 | 25.7 | 71 | 1 | 28 | 10 | 2.25 | |
S1l1~1d | 2375.52 | 4.61 | 0 | 43.0 | 21.6 | 6.1 | 1.3 | 28.0 | 67 | 33 | 2.27 | |||
S1l1~1d | 2374.52 | 4.87 | 0 | 56.5 | 6.4 | 7.5 | 1.4 | 28.2 | 70 | 30 | 2.29 | |||
S1l1~1d | 2370.18 | 5.59 | 0 | 56.5 | 6.6 | 13.7 | 0.8 | 22.4 | 55 | 5 | 40 | 10 | 2.29 | |
S1l1~1d | 2366.17 | 5.44 | 0 | 51.1 | 4.6 | 9.6 | 6.9 | 3.6 | 24.2 | 52 | 48 | 2.44 | ||
S1l1~1d | 2368.10 | 4.82 | 0 | 62.3 | 9.8 | 27.9 | 68 | 32 | 2.47 | |||||
S1l1~1d | 2373.55 | 5.31 | 0 | 57.1 | 5.3 | 8.3 | 4.2 | 25.1 | 39 | 43 | 18 | 10 | 2.57 | |
S1l1~1c | 2371.50 | 6.15 | 0 | 57.8 | 10.4 | 3.7 | 28.1 | 65 | 35 | 2.60 | ||||
S1l1~1c | 2369.34 | 6.39 | 0 | 59.0 | 4.8 | 9.1 | 1.7 | 25.4 | 73 | 27 | 2.71 | |||
S1l1~1c | 2372.48 | 5.98 | 0 | 65.8 | 4.8 | 7.0 | 0.9 | 21.5 | 67 | 3 | 30 | 10 | 2.78 | |
S1l1~1c | 2382.56 | 4.77 | 0 | 37.6 | 5.5 | 13.0 | 10.3 | 3.9 | 29.7 | 51 | 45 | 4 | 10 | 3.18 |
S1l1~1b | 2385.36 | 4.20 | 3.26 | 46.3 | 18.0 | 8.7 | 3.3 | 23.7 | 94 | 6 | 3.21 | |||
S1l1~1b | 2389.65 | 4.77 | 2.07 | 46.6 | 3.9 | 13.2 | 9.2 | 3.1 | 24.0 | 94 | 6 | 3.30 | ||
S1l1~1b | 2380.77 | 4.62 | 0 | 46.1 | 10.3 | 7.7 | 5.1 | 30.8 | 73 | 27 | 3.34 | |||
S1l1~1b | 2381.54 | 5.17 | 55.5 | 61.0 | 13.8 | 7.2 | 4.3 | 13.7 | 88 | 12 | 3.41 | |||
S1l1~1b | 2388.31 | 4.95 | 0 | 57.4 | 12.3 | 13.6 | 3.4 | 13.3 | 21 | 73 | 6 | 10 | 3.46 | |
S1l1~1b | 2389.25 | 5.00 | 0 | 51.3 | 2.5 | 7.8 | 6.4 | 2.5 | 29.5 | 43 | 52 | 5 | 10 | 3.47 |
S1l1~1b | 2384.44 | 3.86 | 3.58 | 65.3 | 13.2 | 9.5 | 2.5 | 9.5 | 47 | 49 | 4 | 10 | 3.52 | |
S1l1~1b | 2383.75 | 5.20 | 0 | 74.6 | 12.6 | 10.9 | 1.9 | 8 | 87 | 5 | 10 | 3.58 | ||
S1l1~1b | 2390.59 | 3.86 | 0 | 62.4 | 9.8 | 7.9 | 1.4 | 18.5 | 58 | 38 | 4 | 10 | 3.65 | |
S1l1~1b | 2386.20 | 5.18 | 38.3 | 76.2 | 13.6 | 7.0 | 3.2 | 95 | 5 | 3.73 | ||||
S1l1~1b | 2387.01 | 3.76 | 0.00225 | 55.6 | 4.3 | 10.2 | 6.1 | 2.9 | 20.9 | 22 | 56 | 22 | 10 | 3.74 |
S1l1~1b | 2379.82 | 5.38 | 6.68 | 60.9 | 10.6 | 7.3 | 1.3 | 19.9 | 65 | 12 | 23 | 10 | 4.07 | |
S1l1~1b | 2391.44 | 5.19 | 49.1 | 52.3 | 19.5 | 10.0 | 2.8 | 15.4 | 76 | 24 | 4.39 | |||
S1l1~1b | 2378.91 | 6.46 | 0 | 58.6 | 4.0 | 10.6 | 5.4 | 3.8 | 17.6 | 73 | 9 | 18 | 10 | 4.77 |
S1l1~1a | 2377.86 | 7.00 | 0 | 58.0 | 15.8 | 5.8 | 2.2 | 18.2 | 59 | 24 | 17 | 10 | 5.10 | |
S1l1~1a | 2376.95 | 8.03 | 0 | 64.4 | 13.5 | 5.7 | 4.1 | 12.3 | 62 | 24 | 14 | 10 | 5.33 | |
S1l1~1a | 2392.53 | 5.94 | 0.0418 | 67.0 | 4.8 | 16.3 | 5.2 | 1.7 | 5.0 | 69 | 31 | 7.54 |
Formation | Depth/m | Minerals Contents (%) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Quartz | Albite | Orthoclase | Calcite | Dolomite | Ankerite | Illite | Chlorite | Apatite | Rutile | Pyrite | Sphalerite | Monazite | Else | ||
S1l1~1a | 2521.2 | 56.14 | 5.07 | 1.06 | 5.72 | 6.56 | 15.85 | 0.65 | 0.05 | 0.1 | 0 | 0.97 | 0 | 0 | 7.81 |
2520.13 | 46.05 | 2.56 | 1.43 | 25.19 | 5.89 | 2.5 | 10.51 | 0.37 | 0.36 | 0.04 | 1.45 | 0 | 0.01 | 3.63 | |
S1l1~1b | 2519.35 | 47.05 | 3.68 | 1.54 | 18.5 | 6.4 | 0.92 | 11.53 | 0.28 | 0.02 | 0.05 | 1.05 | 0 | 0.01 | 8.98 |
2513.75 | 49.26 | 4.5 | 0.85 | 12.3 | 14.79 | 2.54 | 9.69 | 0.43 | 0.06 | 0.04 | 1.02 | 0.01 | 0 | 4.5 | |
S1l1~1c | 2511.52 | 37.25 | 3.3 | 0.91 | 12.24 | 10.12 | 4.17 | 17.3 | 0.67 | 0.06 | 0.04 | 2.19 | 0.04 | 0.01 | 11.7 |
2504.75 | 30.46 | 4.2 | 1.79 | 10.43 | 5.61 | 2.45 | 34.19 | 1.76 | 0.1 | 0.06 | 2.48 | 0 | 0 | 6.47 | |
S1l1~1d | 2502.15 | 21.48 | 5.17 | 0.98 | 5.69 | 0.52 | 4.97 | 52.39 | 2.52 | 0.11 | 0.15 | 1.37 | 0 | 0.01 | 4.62 |
2496.88 | 21.81 | 5.6 | 1.31 | 4.5 | 0.95 | 0.34 | 54.98 | 3 | 0.05 | 0.17 | 1.5 | 0 | 0.01 | 5.78 |
Formation | Depth (m) | Pore Structure Parameters Based on Nano-CT Images | Pore Size Distribution of Nitrogen Adsorption | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Porosity (%) | TOC, wt (%) | OM, wt (%) | φipo (%) | Specific Surface Area (m2/g) | Specific Pore Volume (mL/g) | Average Aperture (nm) | Pore Volume (mL/g) | Micropore Proption (%) | Mesopore Proption (%) | ||
S1l1~a | 2392.53 | 5.94 | 7.32 | 8.11 | 33.8 | 25.12 | 0.027 | 3.82 | 0.1026 | 11.55 | 88.45 |
S1l1~b | 2385.36 | 4.2 | 2.93 | 5.32 | 7.6 | 16.75 | 0.011 | 3.5 | 0.0836 | 10.23 | 89.77 |
S1l1~c | 2369.34 | 6.39 | 4.48 | 5.56 | 27.7 | 23.46 | 0.021 | 3.55 | 0.945 | 15.32 | 84.68 |
S1l1~d | 2363.65 | 3.88 | 2.44 | 2.67 | 25.7 | 9.68 | 0.007 | 3.61 | 0.0651 | 8.56 | 91.44 |
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Wang, M.; He, J.; Liu, S.; Zeng, C.; Jia, S.; Nie, Z.; Wang, S.; Wang, W.; Zhang, C. Effect of Sedimentary Facies Characteristics on Deep Shale Gas Desserts: A Case from the Longmaxi Formation, South Sichuan Basin, China. Minerals 2023, 13, 476. https://doi.org/10.3390/min13040476
Wang M, He J, Liu S, Zeng C, Jia S, Nie Z, Wang S, Wang W, Zhang C. Effect of Sedimentary Facies Characteristics on Deep Shale Gas Desserts: A Case from the Longmaxi Formation, South Sichuan Basin, China. Minerals. 2023; 13(4):476. https://doi.org/10.3390/min13040476
Chicago/Turabian StyleWang, Meng, Jiang He, Shu Liu, Chunlin Zeng, Song Jia, Zhou Nie, Shengxiu Wang, Wei Wang, and Chun Zhang. 2023. "Effect of Sedimentary Facies Characteristics on Deep Shale Gas Desserts: A Case from the Longmaxi Formation, South Sichuan Basin, China" Minerals 13, no. 4: 476. https://doi.org/10.3390/min13040476