石油与天然气地质 ›› 1999, Vol. 20 ›› Issue (3): 232-236.doi: 10.11743/ogg19990312

• 油气空间 • 上一篇    下一篇

吐哈盆地台北凹陷油气封盖主控因素分析

牛嘉玉   

  1. 中国石油天然气集团公司石油勘探开发科学研究院 北京 100083
  • 收稿日期:1999-03-11 出版日期:1999-09-25 发布日期:2012-01-16

ANALYSIS OF CONTROL FACTORS FOR CAP SEALING OIL AND GAS IN TAIBEI SAG,TURPAN HARMI BASIN

Niu Jiayu   

  1. Research Institute of Petroleum Exploration and Development, CNPC, Beijing
  • Received:1999-03-11 Online:1999-09-25 Published:2012-01-16

PDF (PC)

884

被引次数

26

摘要：

吐哈盆地台北凹陷油气封盖的主控因素,在微观封闭性能已满足现今油气藏封盖的油气柱高度时,已转变为盖层厚度变化、平面展布的稳定性和断裂的发育与活动。在两套区域盖层中,七克台组泥质超压层构成的第二套区域性盖层,超压值大于20 MPa 和厚度大于200 m 的范围几乎覆盖了全凹陷,且厚度稳定连续,对其下的两期油气进行了有效的封盖,95%以上的储量位于其下地层,控制了油气的空间展布和富集程度,为最重要的区域性盖层。喜山期断裂活动产生的断裂,在各地的影响不同,鄯善油田以东地区,对油气破坏和调整较弱,两套区域性盖层相对保存完好,油气基本保持原始的展布风貌;以西地区断裂活动较强,两套盖层受到不同程度的切割,打乱了油气的原始展布状态,甚至伴有较大程度的散失,利于喜山期油气藏的形成。

关键词: 台北凹陷, 油气封盖, 异常压力, 油气聚集, 主控因素

Abstract:

When microscopic sealing features satisfy oil reservoir sealing height,the major oil and gas sealing factors of Taibei Sag in Turpan Harmi Basin are related to caprock thickness,stable plane distribution,fault development and activities.Within two caprock sets of the study area,the Qiketai Formation argillaceous overpressure interval,second set caprock with 20 MPa overpressure and more than 200 m thickness which is the nearly covers the whole sag with continuous and stable distribution,and effectively seals the underlying two stages of oil and gas and more than 95% oil and gas reserves.The faults formed in Himalaya Stage in the east part of Sansan Region made less damage on oil and gas,two sets of caprocks preserved completely,and oil gas distribution thus ketp the original style.In the west part of the region,the fault activities were intensive,the two sets of regional caprocks were broken and the original oil gas distribution style was destoried.This is favourable for the formation of oil and gas reservoirs in Himalaya stage.

Key words: Taibei Sag, oil gas sealing, abnormal pressure, oil gas accumulation, major factor

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