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Abstract:The characteristics of coal bed gas reservoir in a mining area in Ordos Basin were studied by X- ray diffraction, mercury pressure test and core conventional physical property analysis. On this basis, the potential damage factors of coal reservoir were studied by sensitivity evaluation experiment. The results show that the main component of the coal reservoir in the target mining area is carbon, followed by clay minerals, pyrite, calcite and a small amount of quartz, and the clay minerals are mainly montmorillonite, kaolinite and chlorite; the average porosity of the reservoir is 4.83%, and the reservoir permeability is mainly distributed among 1.5mD~3.5mD, and the physical property is poor. The results of sensitivity test show that the coal reservoir in the target mining area has strong stress sensitivity, the speed sensitivity and water sensitivity are all strong, the degree of alkali sensitive damage is medium weak, and the degree of acid sensitive damage is moderate. According to the evaluation results of reservoir characteristics and potential damage factors, the suggestion of reservoir protection measures suitable for the target mining area is proposed in order to provide a guarantee for the efficient development of coal bed gas in Ordos Basin.
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