碳封存过程中溶蚀作用对岩石渗透性的影响  

The influence of dissolution on rock permeability during carbon dioxide geological storage

作　　者：田巍[1,2,3] 邓瑞健[1] 李中超[2] 朱维耀[3] 许寻[2] 赵良金[1] 郭立强[2] TIAN Wei;DENG Rui jian;LI Zhong chao;ZHU Wei-yao;XU Xun;ZHAO Liang-jin;GUO Li-qiang(Zhongyuan Oil Field Company of SINOPEC,Puyang 457001,China;Research Institute of Petroleum Exploration ＆ Production,Zhongyuan Oilfield Company of SINOPEC,Puyang 457001,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国石化中原油田分公司,河南濮阳457001 [2]中国石化中原油田分公司勘探开发研究院,河南濮阳457001 [3]北京科技大学土木与资源工程学院,北京100083

出　　处：《陕西科技大学学报》2018年第6期103-109,共7页Journal of Shaanxi University of Science & Technology

基　　金：河南省博士后科研基金项目(2018)

摘　　要：为研究注入深层低渗油藏储层中的CO_2对储层渗透性的影响,采用先进的室内试验手段,分别研究了目标储层的物性及CO_2溶蚀作用特征等.研究表明:目标储层矿物种类以石英、铁白云石、斜长石和方解石为主,粘土矿物主要有伊利石、绿泥石等,平均喉道半径为1.2μm,储层物性一般;注气过程中,方解石逐渐被溶蚀,并且溶蚀程度逐渐加深,Ca^(2+)的含量也明显增加;而长石溶蚀过程中在其表面有次生矿物生成,但生成次生矿物的量不及长石溶蚀量,K^+浓度逐渐增加;粘土矿物在溶蚀过程中生成了大量的次生矿物;岩石矿物的溶蚀与次生矿物生成的综合作用导致岩石渗透率先是略微降低而后缓慢增加.并通过该研究进一步揭示了油水井转注气吸气能力差异的产生机理.研究成果为深入了解注入地下的CO_2的赋存状态提供依据,同时也为深层低渗油藏CO_2驱开发提供重要参考.The paper is about soft measurement of pH in pulp bleaching process. In order to study the influence of dissolution on rock permeability during carbon dioxide geological stor age for deep buried low permeability reservoirs, advanced means of experiments were used to study the target reservoir physical property and CO2 dissolution features. Study shows that： four major minerals of the target reservoir are mainly,quartz, iron dolomite,plagioclase and calcite, mineral composition mainly coμnsists of illite, chlorite, etc. ,the average throat radius is around 1.2 μm,and reservoir physical properties in general. Calcite dissolution gradually during gas injection, and its dissolution degree deepened gradually,while the Ca2＋ concentra tion also increasing gradually in solution. However,secondary mineral formation is produced on the surface of feldspar during feldspar dissolution, but the amount of the new producer is less of the amount of feldspar dissolution. Therefore,and the K2＋ concentration also increas ing gradually in solution. More secondary mineral formation is produced on the surface of the clay mineral during clay mineral dissolution. Just due to the combination results between mineral rock dissolution and secondary mineral formation, the rock permeability is first slightly decrease and then increases slowly. And the study further reveals the mechanism of the gas suction capacity difference between the oil wells and water wells gas. Research results provide the basis of deepened understanding of the CO2 occurrence state injected under ground, as well as provide important reference for CO2 flooding development of deep buried low permeability reservoirs.

关 键 词：封存 深层低渗 渗透性 溶蚀 吸气能力 

分 类 号：TE37[石油与天然气工程—油气田开发工程]