In this paper

by using of some advanced techniques

the organic geoche-mical characteristics of the crude oil and its possible source rocks in Tarimbasin and their oil-source correlations have been studied and presented here.It is pointed out that

in Tarim

the marine beds of Upper Cretaceous-Low-er Tertiary is a moderate source rock only;the Jurassic lacustrine formationis rich in organic matter and may be the best source bed in this basin

but itis distributed only in some local areas

such as Kuqa and Kashi depressions;the Permo-Carboniferous system has a relatively low content of organic mat-ter

but it is widespread and very thick

therefore

it may be the most poten-tial source bed for oil and gas among the three possible source beds in the basin.The high-yield crude oil and gas in the continental Miocene of the Keke-ya oil field are highly maturated and characterized by terrigenous origin

therefore

the author believes that they may migrate from Permo-Carboni-ferous source beds.Some crude oil in the Kuqa depression is marked by marine origin

whichshows that the Meso-Cenozaic in this area may contain some marine sourcebeds.