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In order to evaluate the development potential of coalbed methane in Yangjiapo block on the eastern margin of Ordos Basin and optimize the division method of its development geological units, the geological, resource, reservoir, hydrological and commingled production geological conditions of No.4+5 and No.8+9 coal seams in the block were described by reservoir fine description technology. By using the analogy method and multi-level fuzzy comprehensive evaluation method, the geological conditions of the Baode block in the north were compared, the difficulties of CBM development in the Yangjiapo block were analyzed and summarized, and the evaluation of CBM development potential and division method of development geological units were optimized. The results show that the resource conditions of a single coal seam in the Yangjiapo block are poor, and the cumulative resource abundance of the two coal seams is 1.08×108 m3/km2. The reservoir permeability is good, the difference in physical properties between the layers is small, and it has the potential for combined layer development. Faults have an important influence on the gas content and permeability of coal reservoirs within 300 m, and increase the risk of communicating with roof aquifers. The geological unit division method of coalbed methane development was applied to evaluate the development potential and commingled production compatibility of coalbed methane in the Yangjiapo Block. The six geological development units were divided into three levels of potential areas. It is pointed out that the middle part of Yangjiapo block is suitable for commingled development, some areas in the northwest are suitable for commingled development, and the northeast is suitable for replacement development.
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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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