绿泥石与CO_(2)溶液反应实验研究  

Experimental study on reaction of chlorite with CO_(2) aqueous solution

作　　者：邓家胜[1] 王子逸 何旺达 彭东宇 余波[1] 唐洪明[2] DENG Jiasheng;WANG Ziyi;HE Wangda;PENG Dongyu;YU Bo;TANG Hongming(Baikouquan Oil Production Plant of CNPC Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China;Zhanjiang Branch of CNOOC(China),Zhanjiang,Guangdong 524057,China)

机构地区：[1]中国石油新疆油田公司百口泉采油厂,新疆克拉玛依834000 [2]西南石油大学,四川成都610500 [3]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《油气藏评价与开发》2022年第5期777-783,808,共8页Petroleum Reservoir Evaluation and Development

摘　　要：在CO_(2)与岩石反应的过程中,因岩石中含有石英、钾长石、钠长石等各种成分,各矿物间存在协同/耦合效应,一定程度上对反应进程起着促进或抑制的作用。绿泥石是沉积岩重要的黏土矿物,为明确绿泥石在CO_(2)水溶液中的化学行为与变化历程,利用XRD(X射线衍射)、XRF(X射线荧光光谱)、ICP(电感耦合等离子发射光谱)、SEM(扫描电镜)等手段,系统评价了其在10 MPa、60℃条件下分别与CO_(2)反应7、30 d时间内的状态,重点对比了绿泥石粉末反应前后固相元素、晶体结构及反应液中离子质量浓度变化,结合绿泥石结构特征,明确绿泥石变化的机理。结果表明,绿泥石与CO_(2)反应后液相中Ca^(2+)、Mg^(2+)、Al^(3+)等质量浓度先上升后下降;Si^(4+)质量浓度先上升后趋于平稳,固相中绿泥石d(002)、d(004)峰所对应晶面在反应后遭到破坏,固相元素中Si/Al质量比由4.82升高至5.39。在酸性条件下,水镁石片中的羟基更易于H+结合,释放出Fe^(2+)、Mg^(2+)、Al^(3+)等阳离子,由于水镁石八面体比硅氧四面体和铝氧八面体更易发生离子交换,水镁石片中Mg、Al、Fe等元素先于硅氧四面体和铝氧八面体中的Si、Al溶出。During the reaction between CO_(2) and rocks,there is a synergistic/coupling effect among minerals because the rocks contain quartz,potassium feldspar,albite and other components,which promotes or inhibits the reaction process to a certain extent.The chlorite is an important clay mineral of sedimentary rocks.In order to clarify the chemical behavior and change process of the chlorite in the CO_(2) aqueous solution,the state of chlorite reacting with CO_(2) respectively for 7 and 30 days at 10 MPa and 60℃are systematically evaluated by means of XRD(X-Ray Diffraction),XRF(X-Ray Fluorescence),ICP(Inductively Coupled Plasma),and SEM(Scanning Electron Microscopy),focusing on the comparison of the change of the solid elements,the crystal structure and the ion concentration in the reaction solution before and after chlorite powder reaction.Combined with the structural characteristics of chlorite,the mechanism of chlorite change is clarified.The results show that the concentrations of Ca^(2+),Mg^(2+)and Al^(3+)in the liquid phase firstly increase and then decrease after the reaction of the chlorite with CO_(2).The concentration of Si^(4+)firstly increases and then is stabilized.The crystal planes corresponding to chlorite d(002)and d(004)peaks in the solid phase are destroyed after the reaction,and the mass ratio of Si and Al in the solid element increase from 4.82 to 5.39.Under the acidic conditions,hydroxyl groups in brucite flakes are easier to combine with H^(+)and release cations such as Fe^(2+),Mg^(2+),Al^(3+),etc.Because the brucite octahedron is more prone to ion exchange than silica tetrahedron and alumina octahedron,Mg,Al,Fe and other elements in brucite flakes are dissolved before Si and Al in silica tetrahedron and alumina octahedron.

关 键 词：绿泥石 CO_(2)驱 衍射分析 元素分析 离子质量浓度 

分 类 号：TE357[石油与天然气工程—油气田开发工程]