扫描电镜下寺河井田3号煤微孔裂隙特征研究
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摘要
煤中孔裂隙控制着煤层气的储存场所和产出通道,其特征控制吸附、扩散、渗流等行为。文章采用扫描电镜对寺河井田3号煤层的微孔裂隙进行了观测和分析。结果表明:煤中存在气孔和角砾孔两种微孔隙类型,孔隙形态复杂多样,孔隙被充填现象严重,孔隙的连通性差;煤中以剪性微裂隙发育为主,多发育于原生结构煤中,张性裂隙少见且主要发育于碎裂煤中。裂隙面常见被粒状、片状等碎屑物及方解石脉所充填,在一定程度上影响了煤层的渗透性能。
The coal mesopores control the storage place and output channel of coalbed methane,and its characteristics control adsorption,diffusion,seepage and other behaviors. The microporous fractures of the No. 3 Coal Seam in Sihe Mine Field were observed and analyzed by scanning electron microscopy. The results show that there are two kinds of micropores in the coal,such as pores and breccia pores. The pore morphology is complex and diverse,the pores are filled and the pore connectivity is poor. The shear micro-fractures in coal are mainly developed,and they are mostly developed in primary structural coal. The tensile cracks are rare and mainly developed in fractured coal. The fracture surface is often filled with granules,flakes and other debris and calcite veins,which affects the permeability of the coal seam to some extent.
The coal mesopores control the storage place and output channel of coalbed methane,and its characteristics control adsorption,diffusion,seepage and other behaviors. The microporous fractures of the No. 3 Coal Seam in Sihe Mine Field were observed and analyzed by scanning electron microscopy. The results show that there are two kinds of micropores in the coal,such as pores and breccia pores. The pore morphology is complex and diverse,the pores are filled and the pore connectivity is poor. The shear micro-fractures in coal are mainly developed,and they are mostly developed in primary structural coal. The tensile cracks are rare and mainly developed in fractured coal. The fracture surface is often filled with granules,flakes and other debris and calcite veins,which affects the permeability of the coal seam to some extent.
引文
[1]冯增朝,赵阳升,文再明.煤岩体孔隙裂隙双重介质逾渗机理研究[J].岩石力学与工程学报,2005,24(2):236-240.
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[3]高波,马玉贞,陶明信,等.煤层气富集高产的主控因素[J].沉积学报,2003,21(2):345-349.
[4]刘畅.煤储层微裂缝对煤层气采收率影响的数值分析[J].桂林理工大学学报,2017,37(4):580-586.
[5] Kendall P E,Briggs H. The formation of rock joints and the cleat of coal[J]. Proc R. Soc. Edinburgh,1933(53):164-187.
[6]李强,欧成华,徐乐,等.我国煤岩储层孔-裂隙结构研究进展[J].煤,2008,17(7):1-3.
[7]陈跃,汤达祯,田霖,等.煤变质程度对中低阶煤储层孔裂隙发育的控制作用[J].天然气地球科学,2017,28(4):611-620.
[8]曲闯,左宇军,于迪,等.王庄煤矿不同破坏类型煤体结构差异性及其对瓦斯吸附性能的研究[J].煤矿开采,2017,22(6):88-91.
[9]刘浩,黄文辉,敖卫华,等.沁南3号煤与15号煤显微煤岩组分对微裂隙的控制研究[J].资源与产业,2012,14(4):75-81.
[10]刘贝,黄文辉,敖卫华,等.沁水盆地南部煤中矿物赋存特征及其对煤储层物性的影响[J].现代地质,2014,28(3):645-652.
[11]张帆,贺振华,黄德济,等.预测裂隙发育带的构造应力场数值模拟技术[J].石油地球物理勘探,2000,35(2):154-163.
[12]张慧.煤孔隙的成因类型及其研究[J].煤炭学报,2001,26(1):40-44.
[2]桑树勋.煤吸附气体的固气作用机理(Ⅰ)―煤孔隙结构与固气作用[J].天然气工业,2005,25(1):13-15.
[3]高波,马玉贞,陶明信,等.煤层气富集高产的主控因素[J].沉积学报,2003,21(2):345-349.
[4]刘畅.煤储层微裂缝对煤层气采收率影响的数值分析[J].桂林理工大学学报,2017,37(4):580-586.
[5] Kendall P E,Briggs H. The formation of rock joints and the cleat of coal[J]. Proc R. Soc. Edinburgh,1933(53):164-187.
[6]李强,欧成华,徐乐,等.我国煤岩储层孔-裂隙结构研究进展[J].煤,2008,17(7):1-3.
[7]陈跃,汤达祯,田霖,等.煤变质程度对中低阶煤储层孔裂隙发育的控制作用[J].天然气地球科学,2017,28(4):611-620.
[8]曲闯,左宇军,于迪,等.王庄煤矿不同破坏类型煤体结构差异性及其对瓦斯吸附性能的研究[J].煤矿开采,2017,22(6):88-91.
[9]刘浩,黄文辉,敖卫华,等.沁南3号煤与15号煤显微煤岩组分对微裂隙的控制研究[J].资源与产业,2012,14(4):75-81.
[10]刘贝,黄文辉,敖卫华,等.沁水盆地南部煤中矿物赋存特征及其对煤储层物性的影响[J].现代地质,2014,28(3):645-652.
[11]张帆,贺振华,黄德济,等.预测裂隙发育带的构造应力场数值模拟技术[J].石油地球物理勘探,2000,35(2):154-163.
[12]张慧.煤孔隙的成因类型及其研究[J].煤炭学报,2001,26(1):40-44.