Experimental study on reaction of chlorite with CO<sub>2</sub> aqueous solution

DENG Jiasheng; WANG Ziyi; HE Wangda; PENG Dongyu; YU Bo; TANG Hongming

doi:10.13809/j.cnki.cn32-1825/te.2022.05.009

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Experimental study on reaction of chlorite with CO₂ aqueous solution
Issue 5, Pages: 777-783+808(2022)
Published：2022
DOI： 10.13809/j.cnki.cn32-1825/te.2022.05.009
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DOI：

DENG Jiasheng, WANG Ziyi, HE Wangda, et al. Experimental study on reaction of chlorite with CO₂ aqueous solution[J]. Petroleum Reservoir Evaluation and Development, 2022, (5): 777-783+808. DOI： 10.13809/j.cnki.cn32-1825/te.2022.05.009.

摘要

在CO

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

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

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

反应后液相中Ca

、Mg

、Al

等质量浓度先上升后下降;Si

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

、Mg

、Al

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。

Abstract

During the reaction between CO

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

aqueous solution

the state of chlorite reacting with CO

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

and Al

in the liquid phase firstly increase and then decrease after the reaction of the chlorite with CO

. The concentration of Si

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

etc. Because the brucite octahedron is more prone to ion exchange than silica tetrahedron and alumina octahedron

Fe and other elements in brucite flakes are dissolved before Si and Al in silica tetrahedron and alumina octahedron.

关键词

Keywords

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