【摘要】 <正> 塔里木盆地北部指东经79°—86°30′,北纬39°40′—42°20′之间的广大地区,它包括了北面的库车坳陷、中间的沙雅隆起和南面的阿瓦提-满加尔坳陷北坡(图1)。库车坳陷北缘中、新生界露头中油、气苗广布,并于1958年发现了依奇克里克以侏罗系为储层的油田。1980年以后,更多还原

【Abstract】 The north part of Tarim Basin,including Kuche depression,Shayar upliftand Awati-Manjiar depression,has an area of more than 100,000 sq km.OnSept.22,1984,more than 1,000m³ oil and 2,000,000m³ natural gas per dayhave been tested from well Shacan-2 on Yakela structure of Shayar uplift.Between Kuche and Awati-Manjiar depression,there is east-west extendingShayar uplift which is 460km long and 10-50km wide.It existed as a suc-cesional uplift during early Paleozoic to Mesozoic time.In the south of the uplift,Awati-Manjiar depression contains the Cambrian-Ordovician,Carboniferous-Permian and Triassic-Jurassic source rocks,among which the thick Cambrian-Ordo-vician and Triassic-Jurassic source rocks are widespread with better oil-generationpotential.North of the uplift,the Kuche depression contains mainly Triassic-Ju-rassic source rocks.The Shayar uplift,with many structural,stratigraphic,lithologic and combination traps,is in close proximity to those source rocksand in the direction of oil and gas migration.Therefore,it is favourable forsearching gaint oil and gas fields.The oil and gas in well Shacan-2 are produced from the weathering zoneof the Cambrian-Ordovician dolomites.The oil has high vanadium content（5.88 ppm）,high nickel content （0.76 ppm） and high V/Ni ratio （17.76）.The GC analysis of the saturated hydrocarbon in the crude oil indicates thatthe oil has even carbon predominance of C₂₈,C₃₀ and C₃₂ and its CPI is 0.988.It is considered that hydrocarbons from the well Shacan-2 were probablyderived from the Cambrian-Ordovician marine source rock.However,theTriassic sporo-pollen fossils have been found in the crude oil and many Acri-tarch fossils have been examined in the Triassic sediments of the well Yoacan-1on Shayar uplift,therefore,marine intercalations might exist in Triassic,hydrocarbons from the well Shacan-2 were also probably derived from theTriassic-Jurassic source rock.From above,the authors consider that the Yakelapool is of multi-source origin.更多还原