韩城矿区构造煤储层物性差异特征
The Difference of Physical Properties of Tectonic Coal Reservoirs in Hancheng Block
-
摘要: 采用手标本观察、扫描电镜、压汞法、低温氮吸附和等温吸附试验等方法，综合分析了韩城矿区块构造煤储层煤体结构、孔隙系统、渗透性、甲烷吸附能力等物性差异特征。研究表明：构造运动引起煤岩宏观变形变质，碎裂煤、碎粒煤、鳞片煤、糜棱煤发育；微观-超微观视域内煤颗粒搬运、堆积，煤岩组分剪切变形、揉流褶皱，微米级范围内脆性、脆韧性、韧性煤层流变特征突出；构造变形程度增大，中孔比例升高，孔径配置由并联转化为串联，开放型孔逐步转化为细颈瓶型孔，渗流孔隙比例下降，吸附孔隙比例大幅升高，渗透性降低。但在富水文地质单元条件下，后生矿物充填易导致弱变形煤渗透率下降，加之裂隙由开启渐趋闭合，张性转换为压性、压剪性，孔隙系统及渗流特性的非均质性明显增强；弱变形碎裂煤比表面积至强变形糜棱煤差异量达7.476 3 m2/g，纳米级孔隙氮吸附量由0.698 2 mL/g增至9.354 3 mL/g，甲烷吸附能力显著提升。Abstract: Appling hand specimens, scanning electron microscope, low-temperature nitrogen and isothermal adsorption experiment methods, it studies the difference of physical properties of deformed coal reservoirs in Hancheng Block, including coal body structure, pore system, permeability capacity and absorption ability. The results indicate that tectonic movement can cause coal macro deformation and metamorphism, development of cataclastic coal, granulated coal, flack coal and mylonitic coal. It shows obvious features in the particle transportation and accumulation, shear deformation and corrugation of coal composition in the vision of microscopic to super-microscopic, and brittle rheology, brittle-ductile rheology and ductile rheology at micron level; with the intense of deformation, mesopore enlarges further, pore structure characteristics convert parallel into series, open-end pores changes to thin-neck-bottle-shaped pores gradually, percolation pore decrease, adsorption pore elevates and reservoirs permeability become poor. In the condition of geohydrologic element abundance, mineral substance fill stratification of weak deformation coal and cause permeability decline, while open tensile fractures transforming to close shear fractures, increasing the anisotropy of coal pore system and seepage characteristics; strong altered coal has larger surface area than weak altered coal, the difference can be 7.476 3 m2/g and the nitrogen adsorbance of nano-pore rise from 0.698 2 mL/g to 9.354 3 mL/g, its adsorption ability of CH4 increases obviously.
-
Keywords:
- tectonic activity /
- coal reservoir /
- pore character /
- permeability /
- coalbed gas
-
-
[1] 琚宜文, 姜波, 侯泉林，等. 构造煤结构-成因新分类及其地质意义[J]. 煤炭学报, 2004, 29(5):513-517. [2] WU Y D, JUY W, HOU Q L, et al. Comparison of coalbed gas generation between Huaibei-Huainan coalfields and Qinshui coal basin based on the tectono-thermal modeling[J]. Science China Earth Sciences, 2011, 54(7): 1069-1077. [3] 王恩营, 邵强, 王红卫，等. 华北板块晚古生代煤层构造煤区域分布的大地构造控制及演化[J]. 煤矿安全, 2010（2）:86-89. [4] 叶建平, 岳魏,秦勇，等.中国煤层气聚集区带划分[J].天然气工业,1999,19(5): 9-12. [5] 中国煤田地质总局.中国煤层气资源[M].徐州:中国矿业大学出版社,1998. [6] 毕华,彭格林,赵志忠，等.湘中涟源煤盆测水组煤动力变质作用的特征及其成因探讨[J].地质地球化学, 1997(2): 36-40. [7] CAO Daiyong,LI Xiaoming,DENG Juemei.Coupling Effect Between Coalification and Tectonic-thermal Events Geological Records of Geodynamics of Sedimentary Basin[J].Earth Science Frontiers,2009,16(4):52-60. [8] 蒋建平,罗国煜,康继武.煤X射线衍射与构造煤变质浅议[J].煤炭学报,2001,26(1):31-34. [9] 雷崇利,刘池洋.含煤盆地煤储层后期改造形式及对煤层气选区影响-以华北克拉通选区为例[J].煤田地质与勘探,2004,32(2):20-22. [10] 琚宜文,卫明明,薛传东.华北盆山演化对深部煤与煤层气赋存的制约[J].中国矿业大学学报,2011,40(3):390-398. [11] Frodsham K, Gayer R.A.The impact of tectonic deformation upon coal seams in the South Wales coalfield,UK[J].International Journal of Coal Geology,1998,38:297-332. [12] LI Ming,JIANG Bo,LIN Shoufa.Tectonically deformed coal types and pore structures in Puhe and Shanchahe coal mines in western Guizhou[J].Mining Science and Technology,2011,21:353-357. [13] 张慧,李小彦,郝琦，等.中国煤的扫描电子显微镜研究[M].北京:地质出版社,2003. [14] 张群,杨锡禄.平衡水分条件下煤对甲烷的等温吸附特性研究[J].煤炭学报,1999,24(6):556-570. [15] 琚宜文,姜波,王桂梁.构造煤结构及储层物性[M].徐州:中国矿业大学出版社,2005. [16] Basil Beamish B, Crosdale Peter J.Instantaneous outbursts in underground coal mines: An overview and association with coal type[J].International Journal of Coal Geology,1998,35:27-55. [17] 屈争辉.构造煤结构及其对瓦斯特性的控制机理研究[J].煤炭学报,2011,36(3):533-534. -
期刊类型引用(2)
1. 闵玉，赵永满，鲁浩男，周雪. 基于组合赋权-VIKOR法的农机企业车间布局研究. 南方农机. 2022(11): 10-15 . 
百度学术
2. 韩玮玮，李永安. VIKOR法在既有建筑节能改造中的应用. 低温建筑技术. 2021(11): 26-30 . 百度学术
其他类型引用(2)
计量
- 文章访问数: 532
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 4
下载:
