含油气盆地有机无机作用下非生物烷烃气形成与资源潜力  

Generation and resource potential of abiogenic alkane gas under organic-inorganic interactions in petroliferous basins

作　　者：刘全有 吴小奇[1,2] 朱东亚 孟庆强[1,2] 许汇源 彭威龙[1,2] 黄晓伟 刘佳宜[1,2] LIU Quan-you;WU Xiao-qi;ZHU Dong-ya;MENG Qing-qiang;XU Hui-yuan;PENG Wei-long;HUANG Xiao-wei;LIU Jia-yi(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,SINOPEC,Beijing 100083,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100083 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《天然气地球科学》2021年第2期155-163,共9页Natural Gas Geoscience

基　　金：国家重点研发计划(编号:2019YFA0708504);国家自然科学基金项目(编号:41625009、41872122);中国科学院战略性先导科技专项A类项目(编号:XDA14010404)联合资助.

摘　　要：非生物烷烃气的形成机制和是否具有工业价值是国际关注的焦点。通过费托合成形成的甲烷是非生物烷烃气的重要构成。天然气组分与同位素组成以及壳幔混合模型研究表明,松辽盆地庆深气田烷烃气中除混入了幔源非生物烷烃气外,也有费托合成来源非生物烷烃气的贡献。通过选取典型生物成因气和非生物气的地球化学参数端元并开展混源模拟计算,揭示了该气田天然气探明储量中非生物烷烃气超过600×10^(8) m^(3),其中费托合成甲烷总量超过96×10^(8) m^(3)。计算结果表明,有机无机相互作用下非生物烷烃气可以形成商业性聚集。由于常规气藏中以典型生物成因气占主导,且高—过成熟阶段煤成气与非生物烷烃气地球化学特征具有一定的相似性,从而掩盖了非生物成因气的典型特征。因此,有机无机相互作用生成的非生物烷烃气在含油气盆地内可能广泛存在,以往可能低估了其对气藏的贡献。The generation mechanism of abiogenic alkane gas and whether the gas has industrial values are the focus of international attention.CH4 generated by Fischer-Tropsch synthesis is an important constitute of abio⁃genic alkane gas.The study on the components,isotopic compositions,and crust-mantle mixing model indi⁃cates that,the alkane gas from the Qingshen gas field in the Songliao Basin is contributed by abiogenic alkane gas from Fischer-Tropsch synthesis,besides the mantle-derived abiogenic alkane gas.The authors have select⁃ed the endmembers of typical biogenic and abiogenic gases and conducted mixed source calculation.The abio⁃genic alkane gas accounts for over 600×10^(8) m^(3) in the proven reserves of the gas field,in which the amount of CH4 generated by Fischer-Tropsch synthesis exceeds 96×10^(8) m^(3).The calculation results indicate that,abiogen⁃ic alkane gas under organic-inorganic interactions can form commercial accumulations.Since typical biogenic gas is predominant in conventional gas pools,and high-to over-mature coal-derived gas displays a certain similarity with abiogenic alkane gas,the typical characteristics of abiogenic gas is concealed.Therefore,abiogenic alkane gas generated by organic-inorganic interactions may exist widely in petroliferous basins,and its contribution to gas pools may be underestimated previously.

关 键 词：有机无机相互作用 非生物烷烃气 费托合成 碳同位素 氦同位素 混源模型 

分 类 号：TE121.1[石油与天然气工程—油气勘探]