| 华北石炭—二叠系煤的孔渗特征及主控因素 |
| |
| 引用本文： | 刘大锰,姚艳斌,蔡益栋,张百忍,张可铭,李俊乾.华北石炭—二叠系煤的孔渗特征及主控因素[J].现代地质,2010,24(6). |
| |
| 作者姓名： | 刘大锰 姚艳斌 蔡益栋 张百忍 张可铭 李俊乾 |
| |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划项目，国家科技重大专项项目，教育部长江学者与创新团队发展计划项目，中国石油天然气股份有限公司创新基金 |
| |
| 摘 要： | 煤的低孔、低渗问题已经成为制约我国煤层气勘探和开发的关键问题之一。选取华北河东、渭北、阳泉、晋城、大同和两淮等6个煤田,通过煤岩学特征测试、微裂隙分析和低温氮孔隙结构分析,对该区煤的孔渗发育特征及其控制机理进行了系统研究。华北地区煤的孔隙度在2%～10%之间,孔隙度的大小主要受3次煤化作用跃变所控制,在Ro,r约为1.2%附近达到最小值。矿物充填作用在一定程度上降低了煤的孔隙度。华北地区煤的渗透率一般都在5×10-3μm2以下,渗透率与孔隙度呈显著的幂指数关系。无烟煤以微孔为主,孔隙度都在6%以下,渗透率的大小主要取决于裂隙的发育程度;而中低煤级煤的渗透率不仅受裂隙影响,也受煤中各级孔隙发育的影响较大。
|
| 关 键 词： | 煤 孔隙度 渗透率 煤层气 地质控制 华北 |
Characteristics of Porosity and Permeability and Their Geological Control of Permo-Carboniferous Coals in North China |
| |
| LIU Da-meng,YAO Yan-bin,CAI Yi-dong,ZHANG Bai-ren,ZHANG Ke-ming,LI Jun-qian.Characteristics of Porosity and Permeability and Their Geological Control of Permo-Carboniferous Coals in North China[J].Geoscience——Journal of Graduate School,China University of Geosciences,2010,24(6). |
| |
| Authors: | LIU Da-meng YAO Yan-bin CAI Yi-dong ZHANG Bai-ren ZHANG Ke-ming LI Jun-qian |
| |
| Abstract: | The low porosity and low permeability of coal reservoirs have brought about a big problem for the exploration and exploitation of coalbed methane in China.Based on the coal proximate,coal maceral composition and low-temperature N2 adsorption analyses,microfracture analysis by fluorescence microscope,helium porosity and air permeability analyses,this study investigated the geological control of porosity and permeability of coals in Hedong,Weibei,Yangquan,Jincheng,Datong and Huainan-Huaibei coalfields.The results showed that coal porosity ranged from 2% to 10%,and strongly related to the coalification degree.The porosity reached a minimum value when Ro,r was about 1.2%.The filling and mineralization of pores by minerals were proven to decrease the coal porosity.Coal permeability is commonly less than 5×10-3μm2,and shows an exponential increment relationship with porosity.The anthracite porosity is commonly less than 6%,which dominated by the micro-and meso-pores porosity.The anthracite permeability mainly related to the development of micro-and macro-fractures,while the permeability of bituminous and sub-bituminous coals related not only to the fractures but also to the pores. |
| |
| Keywords: | coal porosity permeability coalbed methane geological control North China |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
