超临界CO_(2)与黏土矿物的化学反应动力学特征  

Dynamic characteristics of chemical reactions between supercritical CO_(2) and clay minerals

作　　者：李小刚[1] 李坤阳 杨兆中[1] 朱静怡[1,2] 袁健峰 易良平 LI Xiaogang;LI Kunyang;YANG Zhaozhong;ZHU Jingyi;YUAN Jianfeng;YI Liangping(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China;Oil Production Technology Research Institute,Daqing Oilfield Company,PetroChina,Daqing 163453,China;School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,四川成都610500 [2]西南石油大学化学化工学院,四川成都610500 [3]中国石油大庆油田有限责任公司采油工艺研究院,黑龙江大庆163453 [4]西南石油大学机电工程学院,四川成都610500

出　　处：《断块油气田》2025年第2期331-338,共8页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金青年基金项目“非均质深层海相页岩原地环境下超临界二氧化碳压裂多尺度造缝机理研究”(42202314)。

摘　　要：为研究黏土矿物在超临界CO_(2)焖井过程中的溶蚀行为与反应强度,选取4种主要黏土矿物进行超临界CO_(2)与黏土矿物的地球化学反应实验研究。采用X射线衍射法和扫描电镜-能谱分析法,分析了4种黏土矿物的矿物成分、元素组成及微观结构对超临界CO_(2)环境的响应特征,基于过渡态理论方程建立了各黏土矿物与超临界CO_(2)的地球化学反应动力学方程。结果表明:4种黏土矿物中钙蒙皂石反应最为剧烈,反应后黏土矿物质量分数下降超30百分点,生成多种新物质;高岭石和伊利石在水岩反应过程中能相互转化,反应后有次生石英生成;绿泥石反应后表面有黑色固碳物质生成及白云石颗粒镶嵌在其中;计算得到各黏土矿物的地球化学反应动力学方程,理论值与实验结果基本一致,验证了方程的准确性;反应速率整体表现为钙蒙皂石>伊利石>高岭石>绿泥石。所得反应动力学方程从单矿物溶蚀动力学层面解释了超临界CO_(2)-黏土矿物的地球化学反应强弱,能对超临界CO_(2)与黏土矿物地球化学反应进行定性及定量分析,可为不同黏土矿物含量储层现场注CO_(2)焖井工艺提供理论支撑。In order to study the dissolution behavior and reaction intensity of clay minerals in the process of supercritical CO_(2) soaking period,four kinds of clay minerals were selected for experimental study of the geochemical reaction between supercritical CO_(2) and clay minerals.The response characteristics of mineral composition,elemental composition and micro-structure of four kinds of clay minerals to supercritical CO_(2) environment were analyzed by X-ray diffraction method and scanning electron microscopy-spectrometry.The dynamic equation of geochemical reaction between clay minerals and supercritical CO_(2) was established based on transition state theory equation.The results showed that the reaction of calcium smectite was the most severe among the four clay minerals,and the mass fraction of clay minerals decreased by more than 30 percentage points after the reaction,and a variety of new substances were formed.Kaolinite and illite could be transformed into each other during the water-rock reaction,and secondary quartz was formed after the reaction.After the chlorite reaction,black carbon fixing minerals were formed on the surface and dolomite particles were embedded in it.The dissolution reaction dynamic equation of each clay mineral was calculated,the theoretical values were in agreement with the experimental results,which verified the accuracy of the equation.The overall reaction rate was shown as follows:calcium smectite>illite>kaolinite>chlorite.The obtained reaction dynamic equation explains the geochemical reaction of supercritical CO_(2) and clay minerals from the single mineral dissolution dynamic,and can provide qualitative and quantitative analysis of the geochemical reaction between supercritical CO_(2) and clay minerals, providing theoretical support for the field CO_(2) injection and well soaking process of reservoirs with different clay mineral contents.

关 键 词：超临界CO_(2) 黏土矿物 地球化学反应 元素分析 动力学方程 

分 类 号：TE343[石油与天然气工程—油气田开发工程]