沁水盆地高煤阶煤吸附时间主要影响因素分析
发布时间：2018-07-15 14:35
【摘要】：为了达到更好的评价煤储层开发潜力的目的,对直接关系到煤储层流体可动性的煤层吸附时间进行了研究,通过对沁水盆地寿阳和柿庄区块3、15号煤层的煤岩进行测试,分析了高煤阶煤吸附时间的特征,讨论了镜质体最大反射率(Rmax)、煤质和气体组分等因素对吸附时间的影响。研究表明:煤阶,即Rmax是影响煤层吸附时间的主要因素,镜质组/惰质组比值、气体组分φ(CO_2)/φ(CH_4)和φ(CH_4)/φ(N_2)为次要因素,单一的显微组分(镜质组、惰质组)和灰分对吸附时间的影响不大。对高煤阶煤岩而言,当Rmax2.9%时,吸附时间随Rmax的增大而增大;当Rmax2.9%时,吸附时间随Rmax的增大而减小,主要是由于随煤岩演化程度增高,煤岩平衡水含量与比表面积综合作用引起煤岩孔隙度、微孔隙结构及比表面积下降,导致煤岩吸附能力下降。此外,受各显微组分吸附能力差异、各类气体吸附特点差异及煤层中气体浓度差等因素的影响,镜质组/惰质组、φ(CO_2)/φ(CH_4)和φ(CH_4)/φ(N_2)均与吸附时间表现为负向包络关系。
[Abstract]:In order to better evaluate the development potential of coal reservoir, the adsorption time of coal seam, which is directly related to the fluid mobility of coal reservoir, is studied, and the coal rock of No. 315 coal seam in Shouyang and Shizhuang blocks in Qinshui Basin is tested. The characteristics of adsorption time of high rank coal are analyzed, and the influence of vitrinite maximum reflectance (Rmax), coal quality and gas composition on adsorption time is discussed. The results show that coal rank, that is, Rmax, is the main factor affecting the adsorption time of coal seams, the vitrinite / inertinite ratio, the gas composition 蠁 (CO2) / 蠁 (CH4) and 蠁 (CH4) / 蠁 (N2) are secondary factors, and the single macerals (vitrinite) are the secondary factors. Inertinite) and ash have little effect on adsorption time. For high-rank coal rocks, the adsorption time increases with the increase of Rmax when Rmax is 2.9%, and decreases with the increase of Rmax when Rmax2.9%, which is mainly due to the increase of evolution degree of coal and rock. The comprehensive action of equilibrium water content and specific surface area of coal and rock leads to the decrease of porosity, micropore structure and specific surface area of coal and rock, which leads to the decrease of adsorption capacity of coal and rock. In addition, under the influence of different macerals adsorption ability, different gas adsorption characteristics and gas concentration difference in coal seam, vitrinite / inertinite group, 蠁 (CO _ 2) / 蠁 (Ch _ 4) and 蠁 (Ch _ 4) / 蠁 (N _ 2) have negative envelope relationship with adsorption time.
【作者单位】： 中国石油大学(北京)地球科学学院;油气资源与探测国家重点实验室;中海石油(中国)有限公司非常规油气分公司;中联煤层气有限责任公司;中海石油(中国)有限公司非常规油气管理处;
【基金】：国家科技重大专项资助项目(2016ZX05044)
【分类号】：TE37
本文编号：2124396
[Abstract]:In order to better evaluate the development potential of coal reservoir, the adsorption time of coal seam, which is directly related to the fluid mobility of coal reservoir, is studied, and the coal rock of No. 315 coal seam in Shouyang and Shizhuang blocks in Qinshui Basin is tested. The characteristics of adsorption time of high rank coal are analyzed, and the influence of vitrinite maximum reflectance (Rmax), coal quality and gas composition on adsorption time is discussed. The results show that coal rank, that is, Rmax, is the main factor affecting the adsorption time of coal seams, the vitrinite / inertinite ratio, the gas composition 蠁 (CO2) / 蠁 (CH4) and 蠁 (CH4) / 蠁 (N2) are secondary factors, and the single macerals (vitrinite) are the secondary factors. Inertinite) and ash have little effect on adsorption time. For high-rank coal rocks, the adsorption time increases with the increase of Rmax when Rmax is 2.9%, and decreases with the increase of Rmax when Rmax2.9%, which is mainly due to the increase of evolution degree of coal and rock. The comprehensive action of equilibrium water content and specific surface area of coal and rock leads to the decrease of porosity, micropore structure and specific surface area of coal and rock, which leads to the decrease of adsorption capacity of coal and rock. In addition, under the influence of different macerals adsorption ability, different gas adsorption characteristics and gas concentration difference in coal seam, vitrinite / inertinite group, 蠁 (CO _ 2) / 蠁 (Ch _ 4) and 蠁 (Ch _ 4) / 蠁 (N _ 2) have negative envelope relationship with adsorption time.
【作者单位】： 中国石油大学(北京)地球科学学院;油气资源与探测国家重点实验室;中海石油(中国)有限公司非常规油气分公司;中联煤层气有限责任公司;中海石油(中国)有限公司非常规油气管理处;
【基金】：国家科技重大专项资助项目(2016ZX05044)
【分类号】：TE37
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