石油与天然气地质 ›› 2002, Vol. 23 ›› Issue (1): 103-106.doi: 10.11743/ogg20020123

• 油气空间 • 上一篇    

塔北地区含油气系统

贾庆素, 周庆凡   

  1. 中国石化集团勘探开发研究院, 北京, 100083
  • 收稿日期:2000-11-11 出版日期:2002-03-25 发布日期:2012-01-16

PETROLEUM SYSTEMS IN NORTH TARIM

Jia Qingsu, Zhou Qingfan   

  1. Research Institute of Exploration and Development, SINOPEC, Beijing
  • Received:2000-11-11 Online:2002-03-25 Published:2012-01-16

PDF (PC)

412

被引次数

58

摘要：

依据塔北地区烃源岩及勘探状况,可划分出寒武+奥陶系、三叠+侏罗系及石炭+二叠系 3套源岩含油气系统,其中,前两套为已知含油气系统,后者为推测含油气系统。现存的寒武+奥陶系含油系统并非其原貌,而是由于构造作用改造后保存下来的残余系统,该系统为塔北地区最重要的含油领域,早期(C-P)亚系统可能是一个统一的含油气系统,以满加尔坳陷为生烃中心,油气以侧运移为主;晚期(C-K)亚系统具有多个生烃中心,油气以垂向运移为主,形成各自独立的分系统。三叠+侏罗系源岩含油气系统为主要的产气领域,生烃中心在库车坳陷,以不整合面和断裂为主要运移通道,进行侧向和垂向运移。该系统中,晚白垩世-早第三纪形成的潮坪膏盐、膏泥岩为区域盖层,对油气的保存起着重要作用。因此,对寒武+奥陶系源岩含油气系统而言,早期亚系统内保存条件为关键因素,阿克库勒凸起有石炭系覆盖的奥陶系分布区为有利勘探区;晚期亚系统规模较小,各自分散,但可成群分布,且埋藏较浅,易于发现。三叠+侏罗系源岩含油气系统具有生烃晚、改造弱、保存好、聚气效率高的特点,是天然气勘探的重要领域。

关键词: 含油气系统, 残留, 原型, 勘探方向, 塔北

Abstract:

Hydrocarbon source rocks in North Tarim Basin can be divided into three petroleum systems such as Cambrian Ordovician system,Tertiary Jurassic system and Carboniferous Permian system.The last one is an inferred system.The first system is a reformed residual one,and also the most important one.The early subsystem(∈-P)was an unified system with Manjar Depression as its oil generation centre;the late subsystem(∈-K)had multiple hydrocarbon generation centres and formed separate branch systems.The second system is the main gas producing realm with Kuqa Depression as its hydrocarbon generation centre.The flat gypsolith and mudrock formed in Late Cretaceous Early Tertiary are regional cap rocks.So it is considered that Cambrian Ordovician petroleum system with good preservation condition is favourable for oil exploration;Tertiary Jurassic petroleum system is an important gas exploration realm for its late hydrocarbon generation,weak reformation and good gas preservation and accumclation conditions.

Key words: petrolem system, residual, prototype, exploration direction, North Tarim

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