Petroleum Accumulation and Distribution in the. Jurassic System in Tarim Basin
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摘要: 侏罗系是目前塔里木盆地所发现的为数不多的具有双重（海相、陆相）油气来源的含油气层系之一。塔里木盆地侏罗系油气聚集有两种基本型式即库车型和塔北型。油气分布在剖面上可分为5个带，即山前冲断－褶皱带、前渊带、斜坡带、前缘隆起张性构造带和按覆背斜带，油气富集明显受断裂和不整合面的控制。Abstract: The Jurassic System is one of the rare oil-bearing horizons with both marine and nonmarine petroleumsources discovered in Tarim Basin up to now. Abundant hydrocarbon source,high porosity and permeability，good muddy caprocks and various kinds of traps constitute beneficial conditions to form the Jurassic oil pools.There are 2 types of petroleum accumulation,i. e. ,Kuche-type and Tabei-type which were formed during Hi-malayan orogeny. Petroleum distribution could be divided into 5 zones including thrust-fold zone，foredeepzone，slope zone，tensional foreland uplift zone and drapping anticline zone. And petroleum occurrence wascontrolled by faults and unconformities which are the secondary migration of petrleum. As a target bed，theJurassic systems distributed in the northern slope of the Tabei uplift,thrust-fold zone of the Kuche depressionand the Yingjisu sag are the favourable exploration area.
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Key words:
- petroleum accumulation /
- model of pool formation /
- Jurassic /
- Tarim Basin
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