黔西织纳煤田华乐勘探区煤层气吸附性研究
Study on Adsorption of Coal Bed Methane in Huale Exploration Zone of Zhina Coalfield in West Guizhou
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摘要: 为了查清华乐勘探区主采煤层的煤层气吸附特征及影响吸附性的主要地质因素,利用采集煤样的等温吸附试验结果,并结合华乐勘探区两口煤层气井试井资料进行了研究。研究表明:华乐勘探区主采煤层吸附量较高,干燥无灰基兰氏体积为17.69～21.38m3/t,平均19.46m3/t;煤储层的实测饱和度均普遍小于100%,分布于75.04%～105.55%,平均84.51%,说明该地区煤储层为欠饱和储层;临界解吸压力1.22～9.10MPa,平均3.25MPa;理论采收率为19.96%～46.15%,平均34.51%。在影响煤储层吸附性的主要地质因素中,煤储层压力、埋深均与含气量呈明显的正相关关系,同时煤储层变质程度越高,煤层中微孔和小孔越发育,吸附甲烷的能力就越强。Abstract: In order to find out the coal bed methane adsorption features of the main mining seams in the Huale Exploration Zone and the main geological factors aff ected to the adsorption, the isothermal adsorption experiment results of the collected coal samples were applied to the study on the logging information of two coal bed methane wells in Huale Exploration Zone.The study results showed that the adsorption value of the main mining seam in Huale Exploration zone was high, the dry no a sh base LangeDs volume was ranging from 17 6921.38 m3/t and the average was 19.46 m3/t.The site measured saturation of the coal reservoir all was less than 100% generally, the distribution was 75.04% 105.55%, the average was 84.51% and the above showed that the coal reservoir in the area was less saturated reservoir.The criti cal desorption pressure was 1.229. 10 MPa and the average was 3.25 MPa. The theoretical mining recovery rate was ranging from 19.96%46. 15% and the average was 3 4.51%.In main geological factors affected to the adsorption of the coal reservoir, the coal reservoir pressure and the reservoir depth would have obvious positive relatio nship to the gas content and meanwhile, the higher metamorphic degree of the coal reservoir, the more developed of the micro pore and small pore in the seam would b e and the higher adsorption capacity of the methane would be.
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Keywords:
- coal bed methane /
- coal reservoir /
- adsorption /
- gas content /
- Zhina Coalfield
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