超临界CO2与煤中矿物的流固耦合响应及其机理

项目名称： 超临界CO2与煤中矿物的流固耦合响应及其机理

项目编号： No.41202117

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 陈润

作者单位： 中国矿业大学

项目金额： 25万元

中文摘要： 超临界CO2与煤中矿物流固耦合是CO2地质封存与煤层气地质研究的重要内容，对CO2地质封存的安全性与煤层气驱替性具有深刻的意义。本项目拟以华北地区重点煤矿煤岩样品作为研究对象，采用高压反应釜模拟不同储层条件下H2O-CO2与煤中矿物的流固反应，分析超临界水溶CO2条件下煤中矿物（粘土矿物、碳酸盐和硅酸盐）的溶蚀与再结晶过程，描述矿物的结晶形态与结构特征；并通过水质分析了解超临界CO2与矿物流固耦合造成煤中元素的迁移情况及迁移规律。在此基础上，采用微孔结构分析仪、等温吸附仪、Zeta电位仪等测试并分析超临界CO2与煤中矿物耦合对煤岩孔隙性、吸附性、表面电位、表面能等特征的改造作用及其改造规律，阐释超临界CO2与煤中矿物流固耦合对煤储层物性的影响。该研究成果可深化煤储层条件下H2O-CO2-矿物的耦合响应认识，为CO2煤层封存安全性评估和CO2-ECBM开采理论提供理论支持。

中文关键词： 超临界CO2；流固耦合；煤中矿物；等温吸附；孔隙结构

英文摘要： It is an important content of studies on CO2 sequestration and coalbed methane geology that the fluid-solid interaction between supercritical CO2 and minerals in coal seams, and has profound significance to the safety of CO2 geological sequestration and enhanced coalbed methane recovery. Minerals and organic matters will be separated with giavity solution separation from coal samples selected from coal mines of North China, then the mineals(clay, carbonate and silicate) and raw coals will be reacted with supercritical H2O-CO2 in high-pressure reactors to simulate the fluid-solid interaction under different reservoirs, respectively. The dissolution and recrystallization of minerals in supercritical H2O-CO2 will be described and the crystal habits and structures of minerals will be analyzed. The elements migration behaviors and rules will be understood through water quality analysis. And based on those, the porosity, adsorptivity, surface electric potential and surface potential of coal samples before and after the fluid-solid interation will be tested with the equipments of microporous structure analyzer, isothermal adsorption, Zeta potentiostat and so on, and the rules will be described to explain the influences on physical preperties of coal petrography of the fluid-solid interaction between supercritical CO2

英文关键词： supercritical CO2；fluid-solid interaction；minerals in coal；isothermal adsorption；pore distribution