基性岩油气储层的CO_2封存潜力及可行性初探——以下辽河坳陷青龙台辉绿岩油气藏为例  

POTENTIAL CAPACITY AND FEASIBILITY OF C0_2 SEQUESTRATION IN PETROLEUM RESERVOIRS OF BASALTIC ROCKS: EXAMPLE FROM THE QINGLONGTAI DIABASE HYDROCARBON RESERVOIR IN THE EASTERN SAG OF XIALIAOHE DEPRESSION,BOHAI BAY BASIN,EAST CHINA

作　　者：王震宇[1] 吴昌志[1] 季峻峰[1] 陈振岩[2] 陈旸[1] 李军[2] 杨光达[2] 顾连兴[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210093 [2]中国石油辽河油田分公司,盘锦124010

出　　处：《第四纪研究》2011年第3期473-482,共10页Quaternary Sciences

基　　金：中国地质调查局项目(批准号:水[2010]矿评03-07-08);国家自然科学基金项目(批准号:40872050)联合资助

摘　　要：辉绿岩油气藏储层一方面含有大量可与CO2反应生成碳酸盐的造岩矿物，另一方面又有枯竭油气藏的良好储（储集空间）、运（运移通道）、盖（盖层条件）和保（保存能力），是潜力大、实施易、成本低和安全性高的CCS（CO，Capture and Storage）靶区。本文在对位于渤海湾盆地下辽河坳陷东部凹陷北段的青龙台辉绿岩油气藏地质特征、储层发育特征等详细描述的基础上，结合对辉绿岩矿物组成、化学成分的分析结果，探讨了下辽河坳陷青龙台辉绿岩油气藏的矿物固碳能力和油气储层固碳能力，并对该辉绿岩油气藏封存CO2的可行性进行了评价。研究表明，青龙台辉绿岩油气藏的储集空间和易碳酸盐化矿物是CO2封存的有利场所，其盖层可阻止所充注CO2的逸散，油气藏的稳定圈闭可保证所充注CO2的安全性，因而是CO2封存的理想靶区。初步的定量计算结果表明，青龙台辉绿岩的矿物固碳潜力为46．0×10^6t，油气储层封存超临界CO2的能力为4．90×10^6t，青龙台辉绿岩油气藏的固碳能力约为18．4×10^6t。The Liaohe oilfield, situated in Xialiaohe Depression, Bohai Bay Basin, Eastern China, is famous for their igneous-related hydrocarbon reservoirs. The Qinglongtai diabase hydrocarbon reservoir,located in the central part of the eastern sag of the depression, covers an area of 1.3km^2 , with a proven oil geological reserve of 750, 000 tons and an output of 31.96 t of oil and current amount of 7856m^3 of gas per day. In this paper,we analyze the geological features and reservoir characteristics of Qinglongtai diabase hydrocarbon reservoir. Combined with mineral and chemical compositions of four diabase core samples, we evaluate the feasibility of CO2 sequestration in petroleum reservoirs of basaltic rocks,and then estimate the CO2 storage capacity of minerals and oil and gas reservoir of the Qinglongtai diabase hydrocarbon reservoir. Our results show that reservoir spaces and minerals which suffer carbonation easily are favorable spots for CO2 sequestration,while the cap rocks can prevent the emission of CO2, and the stability of hydrocarbon reservoir can guarantee the safety of CO2 injection,and should be an ideal target for CO2 sequestration. Estimates of theoretical capacity for CO： storage assume that all the pore space freed up by the production of recoverable hydrocarbon reserves will be replaced by CO2. Therefore the theoretical storage capacity of oil and gas reservoirs can be estimated using most recent reserve databases from the Liaohe oilfield. Based on the principle of water-CO2-rock reaction,the capacity of the mafic minerals in diabase for CO2 sequestration can also be calculated. According to the preliminary calculation, potential mineral capacity for reaction with CO2 is 46.0 × 10^6 tons,while capacity of oil and gas reservoir to storage CO2 supercritical fluid is 4.90× 10^6 tons, and total capacity of CO2 sequestration for the Qinglongtai hydrocarbon reservoir is 18.4×10^6 tons.

关 键 词：CCS(CO2Capture and Storage) 地质封存 辉绿岩 固碳潜力 下辽河 

分 类 号：P588.136[天文地球—岩石学] P343.5[天文地球—地质学]