吉林大学学报(地球科学版)
吉林大學學報(地毬科學版)
길림대학학보(지구과학판)
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
5期
1647-1658
,共12页
莫绍星%龙星皎%李瀛%郑菲%施小清%张可霓%赵良
莫紹星%龍星皎%李瀛%鄭菲%施小清%張可霓%趙良
막소성%룡성교%리영%정비%시소청%장가예%조량
CO2 的矿物封存%网格剖分精度%各向异性%苏北盆地
CO2 的礦物封存%網格剖分精度%各嚮異性%囌北盆地
CO2 적광물봉존%망격부분정도%각향이성%소북분지
mineral sequestration of CO2%grid subdivision precision%anisotropy%Subei basin
基于TOUGHREACT并行版,建立了苏北盆地盐城组下段砂岩层在碳封存中的CO2水岩反应二维径向模型,并评估储层的矿物封存潜力,探讨分析了网格剖分精度和储层各向异性对矿物封存模拟的影响。模拟结果表明:在CO2封存过程中,片钠铝石、方解石和菱铁矿沉淀较明显,在CO2注入5000a后矿物封存的比例高达34.0%;网格剖分精度的不同对矿物封存反应路径没有影响,但粗网格模型计算得到的矿物封存量偏高;降低储层的kv(垂向渗透率)在短期内会促进CO2的水平运移,有利于溶解和矿物封存;但随着时间延长,降低kv对对流作用的抑制开始体现,表现为1000a后中等kv值的模型计算出的矿物封存量高于较大kv和较小kv值的模型。
基于TOUGHREACT併行版,建立瞭囌北盆地鹽城組下段砂巖層在碳封存中的CO2水巖反應二維徑嚮模型,併評估儲層的礦物封存潛力,探討分析瞭網格剖分精度和儲層各嚮異性對礦物封存模擬的影響。模擬結果錶明:在CO2封存過程中,片鈉鋁石、方解石和蔆鐵礦沉澱較明顯,在CO2註入5000a後礦物封存的比例高達34.0%;網格剖分精度的不同對礦物封存反應路徑沒有影響,但粗網格模型計算得到的礦物封存量偏高;降低儲層的kv(垂嚮滲透率)在短期內會促進CO2的水平運移,有利于溶解和礦物封存;但隨著時間延長,降低kv對對流作用的抑製開始體現,錶現為1000a後中等kv值的模型計算齣的礦物封存量高于較大kv和較小kv值的模型。
기우TOUGHREACT병행판,건립료소북분지염성조하단사암층재탄봉존중적CO2수암반응이유경향모형,병평고저층적광물봉존잠력,탐토분석료망격부분정도화저층각향이성대광물봉존모의적영향。모의결과표명:재CO2봉존과정중,편납려석、방해석화릉철광침정교명현,재CO2주입5000a후광물봉존적비례고체34.0%;망격부분정도적불동대광물봉존반응로경몰유영향,단조망격모형계산득도적광물봉존량편고;강저저층적kv(수향삼투솔)재단기내회촉진CO2적수평운이,유리우용해화광물봉존;단수착시간연장,강저kv대대류작용적억제개시체현,표현위1000a후중등kv치적모형계산출적광물봉존량고우교대kv화교소kv치적모형。
The two-dimensional radial model of CO2-water-rock reaction in carbon sequestration of Yancheng Group under section sandstone layer in Subei basin is built based on TOUGHREACT parallel version.The mineral sequestration potential in reservoir is evaluated.The influence of grid subdivision precision and anisotropy of reservoir on mineral sequestration simulations is analyzed.The simulation results show that dawsonite, calcite and siderite, significantly precipitated in the process of CO2 sequestration.The total mass of CO2 sequestrated by mineral trapping is as high as 34.0% after 5000 a. The grid resolution has little impact on the reaction path of minerals sequestration,however,the total amount of CO2 mineral sequestration with coarser grid is overestimated comparing to that with finer grid.The discretion of the vertical permeability (k v )would lead to a more rapid horizontal migration of injected CO2 to the middle and bottom,which results in an incretion in solubility trapping and mineral trapping for a short period of time.However,for a long term,with the increasing instability of the system due to CO2 dissolution,the vertical convective mixing becomes significant,it turns out to be a significant inhibition of convection by decreasing kv .It shows that the mineral sequestration calculated by middle kv value model is higher than the larger kv and smaller kv value model after 1000 a.