摘要
油源岩的有机地球化学特征塔里木盆地有巨厚的沉积盖层,其中主要的生油岩系有三套。一 三套油源岩的沉积特征和有机质丰度1.石炭—二叠系 石炭系以海相碳酸盐岩为主,在中、下石炭统夹有厚层的碳质页岩和石英砂岩。碳酸盐岩中含有丰富的珊瑚和腕足类等化石。
Abstract
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.
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