摘要
20世纪70年代,前人在汾渭盆地进行石油勘探时,于新近—古近系钻遇氦、甲烷、氮等天然气,由于当时以新生界石油勘探为目的,所以未能开展进一步工作。20世纪90年代以来,汾渭盆地地热资源得到了充分的利用,在地热水开采中,发现普遍含天然气。笔者通过盆内对不同构造单元、不同层位的地热井采集的天然气样品进行组分及同位素分析,发现汾渭盆地天然气为国内外少有的以壳源氦为主,有少量幔源氦加入的富氦天然气,并具有较高含量的幔源甲烷。综合前人资料成果,对形成天然气藏的气源条件、储盖组合条件、圈闭条件及运移与保存条件进行了的初步分析,认为汾渭盆地具有形成富氦天然气的地质条件和良好的勘探前景。
In 1970＇s, it is found that natural gas evidence in Neogene-Paleogene period stratum, such as helium, methane and nitrogen, etc, when they had explored oil in Fenwei basin. Because people aimed at exploration oil of Meszoic Erathem in that time, they didn＇t further work. Since 1990＇s, geothermal resources have been enough exploited, the natural gas evidence is very omnipresent, when people muck geothermal water. By analyzing component and isotope of natural gas samplings, those samplings are gathered from geothermal well of different tectonic unit and horizon. The authors discover that the helium of natural gas mainly derived from earth crust, and a little helium come from mantle, furthermore , there is much mantle methane in the natural gas. The authors synthesize former data, and preliminarily analyze natural gas-pool condition of source, reservoir, overburden, trap, migratory and preservation, and consider that there are geologic conditions for formation rich-helium type natural gas and a sound exploration perspective.
出处
《西北地质》
CAS
CSCD
2005年第3期82-86,共5页
Northwestern Geology
关键词
汾渭盆地
富氦天然气
幔源甲烷
勘探前景
Fenwei basin
rich-helium type natural gas
mantle methane
exploration perspective
