致密砂砾岩矿物与超临界CO2和地层水相互作用

Interaction of Tight Glutenite Mineral with Supercritical CO2 and Formation Water

施雷庭 户海胜 张玉龙 高 阳 张 景 张 恒 王 路

SHI Leiting HU Haisheng ZHANG Yulong GAO Yang ZHANG Jing ZHANG Heng WANG Lu

为研究致密砂砾岩油藏CO2注入后与岩石和地层水的相互作用，根据M油田砂砾岩致密油藏全岩X-射线衍射（XRD）分析结果，选取方解石、长石、高岭石、伊利石4种矿物，利用超临界CO2高温高压反应釜模拟地层条件（70℃、20 MPa），通过实验前后XRD、扫描电镜、反应液离子成分及浓度的变化，研究了CO2-岩石矿物、CO2-地层水-岩石矿物的相互作用。结果表明，干燥纯CO2与岩石矿物仅发生物理变化，在地层水中CO2与岩石矿物发生明显的物理化学变化，反应强弱关系为方解石＞伊利石＞长石＞高岭石，反应液中离子浓度亦发生了明显变化。CO2注入储层后，先与水作用，再与地层水中的离子作用，最后与岩石矿物发生化学反应。图17表3参13

In order to study the interaction between CO2，rock and formation water in tight glutenite reservoir，based on the analysis results of X-ray diffraction（XRD）of whole rock in tight glutenite reservoir of M oilfield，calcite，feldspar，kaolinite and illite were selected to simulate formation conditions（70℃，20 MPa）by using supercritical CO2 high temperature and high pressure reactor. The interactions of CO2 with mineral and CO2 with formation water and mineral were studied based on the differences of X-ray diffraction pattern，scanning electron microscopy image of rock mineral，ion composition and concentration of reaction solution before，after the experiment. The results showed that only physical change occurred between dry pure CO2 and rock mineral，while obvious physical and chemical changes occurred between CO2 and rock mineral in formation water. Ion concentration in reaction solution also changed obviously. Four rock minerals were arranged according to their reaction strength with CO2 in formation water in following order：calcite > illite > feldspar > kaolinite. After CO2 injecting into reservoir，it reacted with water first，then with ions in formation water，and finally with rock minerals.

10.19346/j.cnki.1000-4092.2019.04.014