海拉尔盆地呼和湖凹陷低阶煤孔隙分形特征研究  

Fractal characteristics of pore of low-rank coal in Huhehu Sag in Hailar Basin

作　　者：刘冀蓬 胡海燕 刘德勋[3,4] 王涛 刘立航 谢志涛 LIU Jipeng;HU Haiyan;LIU Dexun;WANG Tao;LIU Lihang;XIE Zhitao(School of Geosciences,Yangtze University,Wuhan 430100,China;School of Resources and Environment,Yangtze University,Wuhan 430100,China;PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065077,China;CNPC Key Laboratory of Unconventional Oil&Gas,Langfang 065077,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]长江大学资源与环境学院,湖北武汉430100 [3]中国石油勘探开发研究院,河北廊坊065077 [4]中国石油天然气集团有限公司非常规油气重点实验室,河北廊坊065077

出　　处：《煤矿安全》2021年第8期1-8,共8页Safety in Coal Mines

基　　金：国家科技重大专项资助项目(2016ZX05041);湖北省教育厅创新团队资助项目(T201905)。

摘　　要：为研究有利于煤层气勘探开发的煤储层孔隙结构特征,运用孔隙分形研究方法,探究了海拉尔盆地呼和湖凹陷低阶煤中分形维数与孔径分布、镜质组反射率、兰氏体积与兰氏压力之间的关系。研究表明:海拉尔盆地呼和湖地区低阶煤在不同孔径段内的孔隙具有明显的分形特征,FHH模型计算的分形维数更符合呼和湖地区低阶煤孔隙特征;FHH中不同宏观煤岩类型在相对压力0-0.5和0.5-1.0吸附特征各异得到分维数D_(1)和D_(2),其中D_(1)表征煤吸附孔表面粗糙度,而D_(2)表征吸附孔结构不规则性;D_(2)越高,BET比表面积积越大,微孔含量越高,平均孔直径越小;分形维数D_(1)和D_(2)都可以反映呼和湖地区低阶煤的吸附性能,D_(1)相较D_(2)对煤岩吸附性能的控制作用更大。In order to investigate the pore structure characteristics of coal reservoir which is in favor of the coalbed methane exploration and development,we explored the relationship between fractal dimension and pore diameter distribution,vitriolic reflectance,Langmuir volume and Langmuir pressure in low rank coal in Huhehu area of Hailar Basin.The results showed that the pores of low rank coal in Huhehu area of Hailar Basin have obvious fractal characteristics in different pore sizes.Compared with BET model,the fractal of FHH model is more consistent with the pore characteristics of low rank coal in Huhehu area.In FHH model,the adsorption characteristics of different macroscopic coal rock types are different at the relative pressure of 0 to 0.5 and 0.5 to 1.0,and the fractal dimensions D_(1) and D_(2) are obtained,where D_(1) represents the surface roughness of coal adsorption pore and D_(2) represents the irregularity of adsorption pore structure.The higher D_(2) is,the bigger the BET specific surface area product is,the higher the micropore content is,and the smaller the average pore diameter is.Both the fractal dimension D_(1) and D_(2) can reflect the adsorption performance of low rank coal in Huhehu area,and D_(1) phase plays a greater role in controlling the adsorption performance than D_(2).

关 键 词：海拉尔盆地 低阶煤 低温氮吸附 孔隙特征 分形维数 兰氏体积 

分 类 号：TD712[矿业工程—矿井通风与安全]