石油与天然气地质 ›› 2000, Vol. 21 ›› Issue (3): 272-278.doi: 10.11743/ogg20000319

• 油气空间 • 上一篇    下一篇

准噶尔盆地东部侏罗系沉积体系及油气意义

张满郎, 朱筱敏, 张琴   

  1. 石油大学地球科学系,北京102200
  • 收稿日期:2000-05-25 出版日期:2000-09-25 发布日期:2012-01-16

JURASSIC SEDIMENTARY SYSTEM OF EAST JUNGGAR BASIN AND ITS HYDROCARBON SIGNIFICANCE

Zhang Manlang, Zhu Xiaomin, Zhang Qin   

  1. Department of Earth Sciences, Petroleum University, Beijing
  • Received:2000-05-25 Online:2000-09-25 Published:2012-01-16

摘要:

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。

关键词: 准噶尔盆地东部, 侏罗系, 沉积体系, 沉积环境, 油气意义

Abstract:

Jurassic System developed in the east part of Junggar Basin could be divided into six sedimentary sequences and two tectonic sequences.The sedimentary sequences inclose alluvial fan,braided river,braide river delta and lake sedimentary systems Seatimentary environment includes wetland fan,braided river,braided river delta meandering stream,normal delta,slump turbidite fan,lake shore and shallow lake.The distribution and evolution of the sedimentary systems possess distinct inheritance.There were two provenances in the study area.In sequence I,the north provenance was rich in source materials and formed alluvial fan braided river-braided river delta sedimentary system;in sequence Ⅱ~Ⅲ,lake basin extended and the north provenance receded and formed meandering stream normal deta slump turbidite fan lake sedimentary system;sequences Ⅳ~Ⅴ were controlled by south provenance and small meandering stream deltas formed,the basin rapidly shrank away and meandering stream sediments developed well and distributed extensively.The coal bearing formations in Changji Sag and the slope area,especially the mudstone resulted from lake ingression in sequence Ⅲ are potential source rocks of the study area.The main reservoirs are the sandbodies deposited in the meandering streams and the deltaic sandbodies in sequence Ⅲ in Cainan and the slope area,the sondbodies developed in delta front subaqueous distributive channels of sequences Ⅰ,Ⅲ,Ⅴ in Santai and north Santai areas,the meandering stream sand bars of sequence Ⅵ.

Key words: east Junggar Basin, Jurassic, sedimentary system, depositional environment, hydrocarbon significance

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