摘要
煤岩中孔隙与裂隙的结构、形态等特征直接影响煤层气在煤层中的聚集和运移。为对煤岩中孔裂隙类型及孔裂隙的空间分布进行表征,选取宁武盆地中煤阶煤岩,利用微CT扫描技术对煤岩进行扫描获得CT图像,运用FDK算法重建煤岩的灰度图像并基于宏观孔隙度值对灰度图像进行二值化分割,对CT图像中的微裂纹目标进行了识别;利用CT扫描获得的图像依据煤岩中基质、孔裂隙及矿物组分均表现出不同的CT值分布,实现了煤岩中孔裂隙的三维建模,对煤岩中孔裂隙的尺度以及空间分布进行综合表征。研究成果为后期研究煤岩中气体吸附–解吸–渗流的多尺度过程奠定了基础。
The accumulation and migration of coalbed methane in coal seams is affected by the characteristics ofstructure and shape of pores and fractures in coal. To characterize the type and spatial distribution of the pores andfractures in coal, the paper took the medium rank coal from Ningwu basin, used micro-CT scanning technology toscan to get CT images and adopted the FDK algorithm for construction of grayscale images, then based on experimentalporosity, used binary segmentation to cut the grayscale images and recognizing the micro-fractures in CTimage. By using the images obtained by micro-CT scanning technology and based on the coal matrix, pores （fractures）and mineral components showed a different distribution of CT values and finally the 3D modeing of poresand fractures of coal was realized, and the dimension and the spatial distribution of pores and fractures were characterizedcomprehensively. The research results have great contribution to research the process of gas adsorption–desorption and seepage in coal.
作者
李相臣
陈德飞
康毅力
孟祥娟
LI Xiangchen CHEN Defei KANG Yili MENG Xiangjuan(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in Southwest Petroleum University,Chengdu 610500, China Research Institute of Oil and Gas Engineering, Tarim Oilfield Company, PetroChina, Korla,841000, China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2016年第5期58-62,70,共6页
Coal Geology & Exploration
基金
国家重点基础研究发展计划(973计划)课题(2010CB226705)
国家科技重大专项课题(2011ZX05005-006-008HZ)~~
关键词
煤岩
CT扫描
孔裂隙
灰度值
三维重构
coal
CT scan
pores and fractures
gray value
3D reconstruction
