松辽盆地昌德无机气藏近地表地球化学勘探实验研究

摘要

The Changde gas reservoir in the Songliao Basin is the only inorganic gas reservoir in the world which mainly produces alkane gas with a full geochemical complement. Therefore, the study of Changde inorganic gas reservoir has a great significance for the development of China’s natural gas exploration. We designed a geochemical profile crossing wells Fangshen1 and Fangshen2 above the Changde gas reservoir, studied the near⁃surface display of different geochemical indicators, and selected effective geochemical methods and abnormal indicators. The analysis of methane carbon isotopes can help judge the inorganic origin of the reservoir.%松辽盆地昌德气藏是目前世界上发现的唯一有充分地球化学依据，以产烷烃气为主的无机成因气藏。加强对昌德无机气藏的解剖，对于拓展我国天然气的勘探领域，具有重要意义。在昌德气藏上方，布置了一条贯穿芳深1井和芳深2井的地球化学剖面，通过研究不同地球化学指标在气藏上方的显示特征，确定了昌德气藏有效地球化学方法组合及异常识别标志。同时，结合甲烷碳同位素的分析，可以从一定程度上判断下伏气藏的无机成因属性。