【作者】 李喆； 康永尚； 姜杉钰； 张兵； 王金； 顾娇杨； 叶建平； 张守仁；

【Author】 Li Zhe;Kang Yong-shang;Jiang Shan-yu;Zhang Bing;Wang Jin;Gu Jiao-yang;Ye Jian-ping;Zhang Shou-ren;College of Geosciences, China University of Petroleum (Beijing);State Key Laboratory of Petroleum Resources and Prospecting;CNOOC China Limited,Unconventional Oil & Gas Branch;China United Coalbed Methane Corporation, Ltd;CNOOC China Limited,Unconventional Oil & Gas Administration;

【机构】 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；

【摘要】 煤层的吸附时间直接关系到煤储层的流体可动性,是评价煤储层开发潜力的重要参数。本文通过对沁水盆地寿阳和柿庄区块3#、15#煤层的煤岩测试数据,分析了高煤阶吸附时间的特征,讨论了R_max、煤质和气体组分等因素对吸附时间的影响。研究表明:煤阶(以R_max为依据)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（CO₂/CH₄和CH₄/N₂）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R_max<2.9%时,吸附时间随R_max的增大而增大;当R_max>2.9%时,由于岩浆活动作用引起的煤层温度、微孔隙及比表面积的变化,使得吸附时间随R_max的增大而减小。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,镜惰比、CO₂/CH₄和CH₄/N₂均与吸附时间表现为负向包络关系。更多还原

【Abstract】 The sorption time of coal seam is directly related to the mobility of coal reservoir, and it is an important parameter to evaluate the development potential of coal reservoir. This article through the test data of the 3# and 15# of Shouyang and Shizhuang block in Qinshui Basin, the characteristics of high coal rank sorption time were analyzed, and the influence of Rmax, coal quality and gas composition on the sorption time was discussed. Research shows: Coal rank（based on Rmax content） is the main factor that affects the coal seam sorption time, The vitrinite/inertinite ratio, gas components（CO₂/CH₄ and CH₄/N₂） as a secondary factor, the single points of microstructure（vitrinite and inertinite） and ash content has little effect on the sorption time. In the case of high rank coal, When Rmax < 2.9%, the sorption time increases with the increase of Rmax; when Rmax > 2.9%,the sorption time decreases with the increase of Rmax, mainly through the changes in temperature, porosity and specific surface area of coal seam caused by magmatic activity; In addition, the influence of different factors, such as the difference of sorption capacity, the difference of gas sorption characteristics and the difference of gas concentration in coalbed, all the ratio of macerals vitrinite and inertinite, CO₂/CH₄ and CH₄/N₂ in the gas component have a negative enveloping relationship with the sorption time.更多还原