黔西土城向斜煤储层覆压孔渗试验研究
Experimental study on overburden porosity and permeability of coal reservoir in Tucheng syncline of Western Guizhou
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摘要: 为研究土城向斜中阶煤煤储层孔隙度、渗透率、应力敏感性特征及对煤层气开采的影响，采集土城向斜1号、3号、5号、15号、17号、291号、292号煤层煤心煤样，以覆压孔渗试验为手段，对比各煤储层孔隙度和渗透率随有效应力的变化规律，利用孔隙度应力损害率、渗透率应力损害率及渗透率曲率等参数，分析了各煤储层有效应力敏感性。结果表明：煤储层随有效应力的增大，孔隙度及气体渗透率均呈负指数降低；试验煤储层应力敏感性系数为0.035~0.073 MPa-1，3号煤层应力敏感性回归系数最大;孔隙度应力损害率随有效应力的增加而增加，埋深较浅的3号煤层的应力损害率相对较大；渗透率应力损害率随有效应力的增加而呈指数增加，3号煤层的渗透率损害率明显大于其余煤样；煤储层渗透率曲率随着有效应力的增加，应力敏感性呈指数减弱；在相同有效应力下，3号煤层应力敏感性大于5号、15号、29号煤层，1号、17号煤层应力敏感性最弱。Abstract: In order to study the characteristics of porosity, permeability and stress sensitivity of middle rank coal reservoir in Tucheng syncline and their influence on coalbed methane exploitation, coal core samples of coal seams 1#, 3#, 5#, 15#, 17#, 291# and 292# in Tucheng syncline were collected. Based on the overburden porosity and permeability test, the variation law of porosity and permeability with effective stress of each coal reservoir is compared, and the sensitivity of effective stress of each coal reservoir is analyzed by using the parameters of porosity stress damage rate, permeability stress damage rate and permeability curvature. The results show that: with the increase of effective stress, the coal reservoir porosity and gas permeability were negative exponent; the stress sensitivity coefficient of test coal reservoir is 0.035-0.073 MPa-1, and the stress sensitivity regression coefficient of 3# coal sample is the largest; the stress damage rate of porosity increases with the increase of effective stress, and the stress damage rate of 3# coal sample with shallow burial depth is relatively large. The permeability stress damage rate increases exponentially with the increase of effective stress, and the permeability damage rate of 3# coal sample is obviously larger than that of other coal samples. The permeability curvature of coal reservoir decreases exponentially with the increase of effective stress.Under the same effective stress, the stress sensitivity of 3# coal seam is greater than that of 5#, 15# and 29# coal seam, and the stress sensitivity of 1# and 17# coal seam is the weakest.
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