The Permian Fengcheng Formation is the main source rock and exploration target in Mahu Sag,and the identification of shale oil and gas potential in deep formations has important guiding significance for further exploration activities.Based on shale gas discoveries in Fengcheng Formation in Well Fengyun 1 and exploration achievements in the underlying pre-Fengcheng Formation,the lithologic characteristics,hydrocarbon generation conditions of source rock,and reservoir conditions in Well Fengyun 1 have systematically been analyzed,and the distribution sequence of shale oil and gas in Fengcheng Formation in Mahu Sag has been determined,showing great geological significance.The study results show that Fengcheng Formation in Well Fengyun 1 is mainly composed of salt rock,shale,and silty-fine sandstone;Fengcheng Formation source rock has a relatively low organic matter abundance,and that in the first member has the best quality,with an average TOC of 1.06％;The reservoir is generally tight with an average porosity of 4.65％,and the dolomitic shale and limy sandstone have relatively better physical properties.With the increasing depth,a complete hydrocarbon distribution pattern from shale oil,to shale oil and gas,and to shale gas occurs in Fengcheng Formation in Mahu Sag.In addition,pre-Fengcheng Formation shows good resource potential with hydrocarbon source supplied by the ultra-deep oil and gas system,which is a major field for further exploration.
关键词
准噶尔盆地/玛湖凹陷/风城组/风云1井/页岩油气/油气系统
Key words
Junggar Basin/Mahu Sag/Fengcheng Formation/Well Fengyun 1/shale oil and gas/oil and gas system
维普
万方数据