不同方法表征的煤样应力敏感性对比研究
Comparative Study of Coal Sample Stress Sensitivity Characterized by Different Methods
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摘要: 利用覆压核磁共振和渗透率技术,分别测试4组煤样的孔隙、裂隙的应力敏感性并进行综合分析。结果表明:基于覆压渗透率的压缩系数,随裂隙发育程度增加逐渐增大;孔隙、裂隙对应T2谱面积随应力增大呈指数下降,同一样品中裂隙应力敏感性大于渗流孔,吸附孔最低;相对于孔隙发育型样品,裂隙发育型吸附孔压缩系数随应力变化不甚明显;相同压力范围内,根据渗透率求得的压缩系数明显大于基于核磁共振测试求得的各范围压缩系数。Abstract: The stress sensitivity of pores and fractures in four groups of coal samples was measured and analyzed comprehensively by overburden nuclear magnetic resonance(NMR) and permeability. The results show that the compression coefficient based on the overburden permeability increases with the increase of fracture development, the corresponding T2 spectral area of pore and fracture decreases exponentially with the increase of stress, in the same sample, the stress sensitivity of fracture is greater than that of seepage pore, and the adsorption pore is the lowest; compared with the pore developed samples, the compression coefficient of the fissure developed adsorption pore did not change significantly with the stress; in the same pressure range, the compressibility obtained by permeability is obviously greater than that obtained by NMR.
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Keywords:
- coal reservoirs /
- pore /
- fracture /
- coefficient of compressibility /
- permeability /
- coalbed gas production /
- gas-water migration
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