Abstract: The drilling of Madong well1 results in new recognition of hydrocarbon accumulation potential around Guqiu sag,Jungger basin and gives lessons and experience to stratigraphic hydrocarbon exploration in the area.The expected drilling mission is not reached duo to inadequate hydrocarbon source and poorly identified traps.Recent research indicates there are only under developed hydrocarbon source rocks thin thickness and localized distribution in the sag,which greatly confines the sufficiency of the traps.The cap rocks of penetrated traps are of poor sealing capacity and sufficiency,there are severe uncertainty of the traps.Formation of the reservoirs for the traps will be hard due to inadequate hydrocarbon source,explorative targets for stratigraphic traps should turn to the favorable hydrocarbon capturing areas in migrating channels in south and north rims of Mahai.

Key words: stratigraphic trap, geometric arrangement of wells, trap evaluation, exploration direction, Gaqiu Sag, Qaidam Basin