摘要
为了确定沁水盆地二氧化碳驱煤层气(CO2-ECBM)的增产潜力和煤层CO2的埋存量,通过对已有埋存量评价方法的局限性的分析,依据煤层气的不同赋存状态将埋存量分为吸附埋存量、溶解埋存量和矿化埋存量,根据中国煤层气"三低一高"的特征和勘探开发现状,认为适合埋存CO2的煤层埋深在1 000 m以上,并给出了考虑探明率、CO2与CH4的置换比、采收率、灰分、水分、有效孔隙体积、含气饱和度等因素的埋存潜力评价新方法。沁水盆地的评价结果表明:CO2驱可增加煤层气可采储量1 696×108m3,CO2可埋存量为4.5×108t,考虑经济和技术水平CO2可埋存量为1.4×108t,表明沁水盆地有较大的CO2-ECBM应用潜力和CO2埋存潜力。该研究可为其他地区CO2埋存评价提供借鉴。
In order to determine the increasing production potential of CO_2-ECBM and CO_2 underground storage volume in coalbed,the limitations of available underground storage volume evaluation methods are analyzed. The underground storage volume is classified as adsorption underground storage volume,dissolution underground storage volume and mineralization underground storage volume according to the different occurrences of CBM. According to the characteristic of'three-low and one-high'and current exploration-development situations,the coalbed with a buried depth exceeding 1000 m is favorable to underground storage of CO_2. A new evaluation method of CO_2 underground storage potential is proposed,which considers proven rate,CO_2-CH4 replacement ratio,recovery factor,ash content,water content,effective porosity,gas saturation,etc. The corresponding evaluation in Qinshui Basin demonstrates that CO_2-ECBM may increase CBM recoverable reserve by 1 696 × 108m3,the CO_2 underground storable volume is4. 5 × 108 t and the economic-technological CO_2 underground storable volume is 1. 4 × 108 t,which indicate great application potential of CO_2-ECBM and CO_2 underground storage in Qinshui Basin. Research could provide a reference for CO_2 underground storage evaluation in other regions.
出处
《特种油气藏》
CAS
CSCD
北大核心
2016年第2期112-114,156,共3页
Special Oil & Gas Reservoirs
基金
国家"973"项目"二氧化碳减排
存储和资源化利用的基础研究"(2011CB707302)
国家油气重大专项课题"新一代油藏数值模拟软件"(2011ZX05009006)
