石油与天然气地质 ›› 1997, Vol. 18 ›› Issue (3): 231-235.doi: 10.11743/ogg19970313

• 论文 • 上一篇    下一篇

吐-哈盆地台北凹陷温吉桑辫状河三角洲与油气聚集

李文厚   

  1. 西北大学地质系, 西安 710069
  • 收稿日期:1997-02-24 修回日期:1997-04-07 出版日期:1997-09-25 发布日期:2012-01-18

WENJISANG BRAID DELTA IN TAIBEI SAG,TURPAN-HAMI BASIN AND ITS HYDROCARBON ACCUMULATION

Li Wenhou   

  1. Department of Geology, Northwest University, Xian, Shaanxi
  • Received:1997-02-24 Revised:1997-04-07 Online:1997-09-25 Published:2012-01-18

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摘要：

温吉桑辫状河三角洲由辫状河三角洲平原、辫状河三角洲前缘和辫状河前三角洲构成,主要沉积特征是:(1)缺失曲流河等陆上环境,是一个相带发育不完整的沉积体系;(2)沉积物粒度相对较粗,结构及矿物成熟度较低;(3)前缘水下分流河道沉积发育,常反复叠置成巨厚层;(4)前缘通常形成在距高地不远的湖盆边缘。辫状河三角洲的形成演化主要受湖盆边界类型、距湖盆距离和古气候的制约,中侏罗世时,辫状河道沿倾向逐渐向湖盆进积和横向迁移,从而形成规模较大的席状砂体。中、下侏罗统是重要的生烃层系,中侏罗统辫状河三角洲水下分流河道是主要的储油层段,上侏罗统棕红色泥岩是良好的区域性盖层,它们构成了一套完整的生储盖组合。

关键词: 台北凹陷, 温吉桑, 辫状河三角洲, 沉积特征, 水下分流河道, 生储盖组合

Abstract:

WenJisang braid delta system in Taibei Sag, Turpan-Hami Basin consists of delta plain, delta front and prodelta. The main sedimentary characteristics of the system are:1.Braid river deltas that lack meandering river facies are a incompletely developed deposition system.2.Sediments are characterized by coarse grain size,lower mineralogic and textural maturity.3.Subaqueous distributary channel deposits developed well in delta front,they are usually superimposed to form huge thickness of sequences.4.The delta front usually formed in lake basin margin. Braided river channels prograded towards lake basin and transported laterally in Middle Jurassic,thus forming a large sheet sandbody. Coal measures of Lower-Middle Jurassic are the most important hydrocarbon generation interval;Middle Jurassie subaqueous distributary channel is the main reservoir interval.Upper Jurassic brown-red mudstone could be fine regional caprock.They constitute a complete source reservoir-cap rock assemblage.