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The strong heterogeneity of the Lower Permian gas reservoir in the Hechuan Gas Field and the significant differences in gas well productivity, along with the unclear characteristics of high-efficiency wells, have constrained the profitable development of the gas reservoir. To identify the controlling factors of high-yield wells, research was conducted from both geological and engineering perspectives, focusing on the relationships between paleogeomorphology, dolomitization degree, reservoir thickness, fracture and vug development, acid treatment volume, and gas test productivity. The results indicate that wells located in high paleogeomorphological positions, with high dolomite content and large reservoir thickness, exhibit well-developed fractures and vugs, achieving productivity of up to a million cubic meters. Large-scale acid treatments can modify the surrounding reservoir of the wells, enhancing their productivity.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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