Analysis of Factors Influencing Tight Sandstone Gas Production and Identification of Favorable Gas Layers in the Shan 23 Sub-Member of the Daning-Jixian Block, Eastern Ordos Basin
Abstract
:1. Introduction
2. Geological Background
2.1. Structural Geological Conditions
2.2. Strata
3. Data Collection and Analysis Methods
4. Results and Discussion
4.1. Productivity Characteristics
4.2. Analysis of Single Factors
4.2.1. Sedimentary Facies
4.2.2. Thickness
4.2.3. Porosity
4.2.4. Permeability
4.2.5. Gas Saturation
4.3. Gas Productivity Coefficient, Gas Storage Coefficient, and Enrichment Coefficient
4.4. Gas Layer Type
5. Conclusions
- (1)
- According to gas well production statistics, Shan 23 stands out as the primary production layer in the study area. Within the first 6 months of production from the Shan 23 gas layer, daily gas production ranged from 2576.19 to 156,078.17 m3/d, averaging 24,037.9 m3/d. Over the first year, average daily production varied from 2185.05 to 136,806.99 m3/d, averaging 23,469.23 m3/d, indicating relatively stable production from the Shan 23 layer alone.
- (2)
- In the dominant central area of the underwater distributary channel delta front in Shan 23, the sand body exhibits a superimposed cutting type, resulting in high production rates. Conversely, the sand bodies on the periphery gradually transition to superimposed and isolated types, leading to decreased production. Through correlation analyses of gas layer thickness, porosity, permeability, and gas well initial production, it was determined that the gas production from the wells within the same layer is primarily influenced by gas layer thickness, porosity, and permeability. Gas saturation demonstrates a minimal impact on production according to single-factor analysis.
- (3)
- As evaluation factors of favorable areas, the gas productivity coefficient, gas storage coefficient, and enrichment coefficient of the study area exhibit similar distribution patterns, characterized by high values in distributary channel zones and delta lobes. Conversely, areas lacking well-developed skeleton sand bodies generally display lower overall parameter values. By establishing linear correlations between these parameters and average gas production, this study further classified favorable reservoirs within the area. The classification standards for reservoir parameters in various types of gas-producing reservoirs offer guidance for positioning high-yield gas wells in the study area.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Foramtion | Member | Sub-Member | Sublayer | Main Signing Layer |
---|---|---|---|---|
Shihezi Formation (P2h) | He8 | Luotuobozi sandstone (K4) | ||
Shanxi Formation (P1s) | Shan1 | Shan11 | Shan11 mudstone | |
Shan12 | Shan12 sandstone | |||
Shan13 | Tiemogou sandstone | |||
Shan2 | Shan21 | No. 1 coal; No. 2 coal | ||
Shan22 | No. 3 coal; No. 4 coal | |||
Shan23 | Shan 23−1 | No. 5 coal | ||
Shan 23−2 | ||||
Shan 23−3 | Beichagou sandstone (K3) | |||
Taiyuan Formation (P1t) | Tai1 | Dongdayao limestone | ||
Tai2 |
Well | Gas Layer Thickness (m) | Porosity (%) | Permeability (mD) | Gas Saturation (%) | Gas Production Coefficient | Gas Storage Coefficient | Gas Enrichment Coefficient | A6M (m3/d) | A1Y (m3/d) | Well Type |
---|---|---|---|---|---|---|---|---|---|---|
D1 | 15.50 | 6.26 | 0.18 | 75.65 | 2.85 | 0.97 | 0.73 | 14,610.58 | 12,494.31 | II |
D2 | 9.25 | 6.57 | 0.24 | 78.84 | 2.24 | 0.61 | 0.48 | 7126.12 | 6657.75 | III |
D3 | 9.25 | 6.62 | 0.23 | 78.43 | 2.15 | 0.61 | 0.48 | 8083.06 | 8147.65 | III |
D4 | 19.63 | 7.35 | 0.43 | 79.30 | 8.40 | 1.44 | 1.14 | 12,903.87 | 14,268.91 | II |
D5 | 11.13 | 5.93 | 0.14 | 84.31 | 1.50 | 0.66 | 0.56 | 40,110.41 | 33,734.78 | I |
D6 | 3.88 | 6.48 | 0.21 | 60.00 | 0.80 | 0.25 | 0.15 | 20,605.85 | 27,280.41 | I |
D7 | 4.00 | 6.84 | 0.26 | 93.14 | 1.06 | 0.27 | 0.25 | 4479.12 | 3187.73 | III |
D8 | 4.75 | 6.39 | 0.19 | 60.00 | 0.90 | 0.30 | 0.18 | 30,377.70 | 24,113.63 | I |
D9 | 13.50 | 6.47 | 0.20 | 86.41 | 2.69 | 0.87 | 0.75 | 10,290.40 | 7264.50 | III |
D10 | 2.00 | 7.18 | 0.38 | 71.93 | 0.75 | 0.14 | 0.10 | 2904.11 | 2232.95 | III |
D11 | 3.25 | 5.97 | 0.14 | 77.87 | 0.46 | 0.19 | 0.15 | 15,766.27 | 15,985.11 | II |
D12 | 6.00 | 5.97 | 0.14 | 94.66 | 0.85 | 0.36 | 0.34 | 9841.48 | 6376.64 | III |
D13 | 3.75 | 7.65 | 0.55 | 97.43 | 2.08 | 0.29 | 0.28 | 2837.64 | 3655.40 | III |
D14 | 10.63 | 6.79 | 0.31 | 84.66 | 3.25 | 0.72 | 0.61 | 11,325.85 | 14,228.44 | II |
D15 | 6.75 | 7.03 | 0.16 | 72.78 | 1.09 | 0.47 | 0.35 | 44,262.86 | 45,016.87 | I |
D16 | 15.38 | 8.35 | 1.63 | 81.98 | 25.09 | 1.28 | 1.05 | 32,964.45 | 43,018.36 | I |
D17 | 2.20 | 5.73 | 0.13 | 57.30 | 0.29 | 0.13 | 0.07 | 49,835.02 | 62,647.43 | I |
D18 | 20.42 | 7.04 | 0.32 | 75.38 | 6.49 | 1.44 | 1.08 | 47,429.52 | 41,208.90 | I |
D19 | 14.63 | 7.29 | 0.82 | 79.34 | 12.02 | 1.07 | 0.85 | 44,169.63 | 43,205.49 | I |
D20 | 7.88 | 6.41 | 0.24 | 77.56 | 1.91 | 0.50 | 0.39 | 62,718.31 | 53,913.13 | I |
D21 | 9.75 | 10.97 | 6.33 | 83.35 | 61.76 | 1.07 | 0.89 | 30,797.01 | 31,594.77 | I |
D22 | 6.96 | 5.61 | 0.11 | 66.03 | 0.74 | 0.39 | 0.26 | 27,778.48 | 27,823.98 | I |
D23 | 6.13 | 6.41 | 0.22 | 68.76 | 1.34 | 0.39 | 0.27 | 64,813.60 | 62,861.19 | I |
D24 | 11.00 | 7.05 | 0.18 | 72.36 | 1.99 | 0.78 | 0.56 | 9778.84 | 8790.40 | III |
D25 | 16.13 | 7.82 | 0.53 | 79.73 | 8.59 | 1.26 | 1.01 | 9235.05 | 7380.57 | III |
D26 | 1.13 | 6.81 | 0.30 | 75.79 | 0.34 | 0.08 | 0.06 | 11,514.65 | 10,901.42 | II |
D27 | 11.25 | 6.41 | 0.19 | 80.11 | 2.15 | 0.72 | 0.58 | 13,490.91 | 14,596.22 | II |
D28 | 6.13 | 9.07 | 0.18 | 79.27 | 1.10 | 0.56 | 0.44 | 19,364.17 | 19,034.96 | II |
D29 | 9.00 | 5.13 | 0.08 | 72.40 | 0.70 | 0.46 | 0.33 | 20,939.36 | 19,940.57 | II |
D30 | 4.88 | 6.16 | 0.19 | 66.50 | 0.91 | 0.30 | 0.20 | 6106.00 | 7287.17 | III |
D31 | 7.23 | 8.34 | 0.86 | 87.03 | 6.24 | 0.60 | 0.52 | 5786.81 | 11,100.52 | II |
D32 | - | 4.80 | 0.12 | 82.10 | - | - | - | 10,476.88 | 14,903.08 | II |
D33 | 9.38 | 6.23 | 0.17 | 60.54 | 1.58 | 0.58 | 0.35 | 25,037.59 | 22,708.88 | I |
D34 | 1.13 | 5.90 | 0.13 | 72.49 | 0.15 | 0.07 | 0.05 | 6145.11 | 7087.51 | III |
D35 | 8.75 | 6.11 | 0.15 | 57.69 | 1.34 | 0.53 | 0.31 | 5700.73 | 4993.08 | III |
D36 | 6.13 | 6.61 | 0.22 | 63.81 | 1.32 | 0.40 | 0.26 | 4492.78 | 5028.65 | III |
D37 | 13.25 | 6.50 | 0.21 | 62.05 | 2.72 | 0.86 | 0.53 | 3099.96 | 2862.57 | III |
D38 | 4.75 | 6.37 | 0.20 | 67.90 | 0.96 | 0.30 | 0.21 | 2576.19 | 2185.05 | III |
D39 | 19.38 | 5.83 | 0.14 | 79.58 | 2.77 | 1.13 | 0.90 | 58,031.11 | 55,725.77 | I |
D40 | 2.00 | 8.40 | 0.75 | 77.37 | 1.50 | 0.17 | 0.13 | 2696.91 | 3030.05 | III |
D41 | 16.38 | 11.09 | 18.02 | 90.57 | 295.04 | 1.82 | 1.64 | 88,026.83 | 80,251.52 | I |
D42 | 22.00 | 8.30 | 1.44 | 88.25 | 31.64 | 1.83 | 1.61 | 156,078.17 | 136,806.99 | I |
D43 | 6.00 | 6.14 | 0.20 | 65.31 | 1.19 | 0.37 | 0.24 | 5385.80 | 5385.80 | III |
Evaluation Parameters | Gas Layer Type | ||
---|---|---|---|
I | II | III | |
Average gas production (m3/d) | >20,000 | 10,000~20,000 | <10,000 |
Sedimentary facies | Distributary channel zones and delta lobes | The river channel flank | The river channel edge |
Gas layer thickness (m) | >7.14 | 3.20~7.14 | <3.20 |
Porosity (%) | >7.50 | 6.54~7.50 | <6.54 |
Permeability (mD) | >0.50 | 0.1~0.5 | <0.1 |
Gas productivity coefficient | >3.57 | 0.32~3.57 | <0.32 |
Gas storage coefficient | >0.67 | 0.10~0.67 | <0.10 |
Enrichment coefficient | >0.53 | 0.06~0.53 | <0.06 |
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Sun, J.; Chen, M.; Wang, B.; Wang, G.; Tian, H.; Hou, J.; Zhu, B. Analysis of Factors Influencing Tight Sandstone Gas Production and Identification of Favorable Gas Layers in the Shan 23 Sub-Member of the Daning-Jixian Block, Eastern Ordos Basin. Processes 2024, 12, 1810. https://doi.org/10.3390/pr12091810
Sun J, Chen M, Wang B, Wang G, Tian H, Hou J, Zhu B. Analysis of Factors Influencing Tight Sandstone Gas Production and Identification of Favorable Gas Layers in the Shan 23 Sub-Member of the Daning-Jixian Block, Eastern Ordos Basin. Processes. 2024; 12(9):1810. https://doi.org/10.3390/pr12091810
Chicago/Turabian StyleSun, Junyi, Ming Chen, Bo Wang, Gang Wang, Haonian Tian, Jie Hou, and Boning Zhu. 2024. "Analysis of Factors Influencing Tight Sandstone Gas Production and Identification of Favorable Gas Layers in the Shan 23 Sub-Member of the Daning-Jixian Block, Eastern Ordos Basin" Processes 12, no. 9: 1810. https://doi.org/10.3390/pr12091810