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准噶尔盆地东部侏罗系可划分出 6个沉积层序和 2个构造层序 ,下部构造层序包含层序 Ⅰ～Ⅳ ,上部构造层序包含层序Ⅴ～Ⅵ。在 6个沉积层序中 ,发育了冲积扇、河流、三角洲、湖泊沉积体系 ,并识别出湿地扇、辫状河、辫状河三角洲及曲流河、正常三角洲、滑塌浊积扇、滨湖、浅湖等沉积环境。沉积体系的分布和演化具有明显的继承性 ,发育有南、北两个物源区 ,层序I,北物源充足 ,形成冲积扇辫状河辫状河三角洲沉积体系 ;层序Ⅱ～Ⅲ ,湖盆扩张 ,北物源总体退却 ,形成了曲流河正常三角洲滑塌浊积扇湖泊沉积体系 ;层序Ⅳ～Ⅴ ,受南物源控制形成小型曲流河三角洲 ;至层序Ⅵ ,盆地急剧萎缩消亡 ,形成广布的曲流河沉积。昌吉凹陷及斜坡区的含煤地层 ,尤以层序Ⅲ湖侵泥岩最具生烃潜力 ,彩南及斜坡区层序Ⅲ曲流河、三角洲砂体为主要储层 ,三台及北三台地区油气储层主要为层序Ⅱ ,Ⅲ ,Ⅴ三角洲前缘水下分流河道砂体及层序Ⅵ曲流河道砂坝
The Jurassic in the eastern Junggar Basin can be divided into six sedimentary sequences and two structural sequences, the lower structural sequence includes sequences Ⅰ ~ Ⅳ, and the upper structural sequence includes sequences Ⅴ ~ Ⅵ. Among the six sedimentary sequences, alluvial fan, fluvial, deltaic and lacustrine sedimentary systems were developed. Wetland fan, braided river, braided river delta and meandering river, normal delta, slip turbidite fan, Lake, shallow lake and other sedimentary environment. The distribution and evolution of sedimentary system have obvious succession. There are two provenance areas in the south and north. The sequence I and the northern source are abundant, forming alluvial fan braided river braided river delta sedimentary system. Sequence Ⅱ ~ Ⅲ , The extension of the lake basin and the general retreat of the north provenance resulted in the formation of the normal Delta smooth turbidite fan lake sedimentary system in the Meandering River; the sequences Ⅳ-Ⅴ were controlled by the Southern provenance to form small meandering delta; and to the sequence Ⅵ, The basin drastically dwindled to form a broadly meandering river sediment. The coal-bearing strata in the Changji Depression and the slope area have the most potential for hydrocarbon generation especially in the sequence Ⅲ lake invasion mudslides. The sequence sequence of the Cai’nan and slope zone Ⅲ meandering rivers and deltaic sandbodies are the major reservoirs. The three reservoirs and the three northern areas The main oil-gas reservoirs are the sub-distributary channel sand bodies and their sequences in the delta front, the delta front and the delta riparian channel sand bar