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Rock physico-mechanical parameters, such as porosity, permeability, and elastic modulus of fractured-vuggy carbonate reservoirs, are key factors affecting oil and gas extraction efficiency. Consequently, this paper examined the Ordovician fractured-vuggy type carbonate reservoir in the Fuman area of the Tarim Basin, and systematically studied the mechanical parameters of the reservoir rock through uniaxial and triaxial compression experiments, acoustic emission experiments, and stress sensitivity experiments to elucidate the stress state of the reservoir under in-situ conditions. The results indicate that: 1) as the confining pressure increases, the compressive strength and elastic modulus of the rock progressively increase, transitioning the rock from brittle to plastic and exhibiting strain hardening characteristics. 2) the permeability of the carbonate reservoir gradually decreases with increasing confining pressure, with significant changes observed below 30 MPa. 3) the maximum horizontal principal stress in the study area is 186.14 MPa, the minimum horizontal principal stress is 150.82 MPa, and the vertical stress is 172.89 MPa, reflecting the stress characteristics of a strike-slip fault. The results of this study can provide technical support for the efficient exploration and development of fractured-vuggy carbonate reservoirs.
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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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