关键词: 济阳坳陷, 二氧化碳, 火山和断裂, 幔源-火山岩浆型

Abstract: The carbondioxide gas fields are a kind of high economic nonhydrocarbon ones. It is very important to research origin of carbondioxide gas fields in theory and practice on exploration and development and utilization. The carbondioxide gas fields in Jiyang basin are researched in detail on the analysis of origin, geological conditions and tectonic background in this paper. On the basis of gas ingredients and carbon isotopes, the carbondioxide gas in Jiyang basin is from mantlevolcanic magma. According to the locations of carbondioxide gas fields, volcanics and faults, the carbondioxide gas fields are closely relative to the Middle and Late Neozoic volcanoes. The NW Shicun fault is the regional transporting path of carbondioxide gas. NE and nearly EW faults control the local reservoir structures. The Tanlu fault zone to the east of Jiyang basin may be the source of mantle magma with carbondioxide gas on the basis of tectonic background.

Key words: Jiyang basin, carbondioxide, volcanoes and faults, mantle-volcanic magma