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Objective Current domestic and international research on bauxite oil and gas reservoirs is limited in scope. The bauxite reservoir with high-yield industrial gas flow discovered in the Taiyuan Formation， Longdong area， southwestern Ordos Basin， represents a significant advance in the exploration for bauxite gas reservoirs， and the recent identification and production tests of bauxite rock series in the Benxi Formation in the Linxing area at the northeastern margin of the basin suggests promising exploration potential.Further natural gas exploration and development in the bauxite series in the Linxing area requires a comprehensive analysis of the fundamental geology of the sedimentary environment， including the mineral composition， reservoir pore properties and the structure of the bauxite series. In addition， it is essential to identify the factors that control the development of bauxite and which areas are most conducive to such activity. Methods A comprehensive analysis of the sedimentary environment， reservoir characteristics and sedimentary model of the Benxi Formation bauxite rock series in the Linxing area was conducted using logging， seismic data， X-ray diffraction， casting thin sections， scanning electron microscopy， major and trace elements， high-pressure mercury injection， N2 and CO2 adsorption and conventional physical properties， and other experimental methods. Results The bauxite rock series in the study area is characterized by a high concentration of diaspore and clay minerals， and has a distinctive three-stage vertical structure. The lower portion is rich in iron， the middle zone contains a higher aluminum content， and the upper section has a lower iron concentration. The pore types include predominantly dissolution pores typically ranging between 2 nm and 50 nm， along with intercrystalline pores， organic pores and microfractures. The sorting and connectivity of the pores are relatively good， with average porosity 3.64% and average permeability 7.24×10-3 μm2. Conclusions The thickness of a bauxite rock series depends upon the sedimentary environment and karst paleogeomorphology. A shallow-water sedimentary environment with high temperature and high humidity， low oxygen levels and alternating marine and terrestrial conditions is optimal for its formation and preservation. A slope， or buried pit， is a crucial area for exploration and development. This understanding provides a geological foundation for the exploration and development of natural gas in bauxite with comparable geological background in this region.
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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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