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现代地质 ›› 2009, Vol. 23 ›› Issue (4): 746-754.

• 生烃与成藏 • 上一篇    下一篇

渤海盆地辽东湾地区古近系烃源岩成熟演化模拟

左银辉1,2,邱楠生1,2,李建平3,郭永华3,李翠翠1,2,常健1,2   

  1. 1中国石油大学 油气资源与探测国家重点实验室, 北京102249; 2中国石油大学 盆地与油藏研究中心, 北京102249; 
    3中国海油 天津分公司,天津 塘沽300452
  • 收稿日期:2009-01-05 修回日期:2009-03-07 出版日期:2009-08-20 发布日期:2011-12-21
  • 基金资助:

    国家自然科学基金项目(U0633003); 中国海油天津分公司重大项目(SC06TJ-TQL-004)。

Simulation of Maturity Evolution of Paleogene Source Rocks in Liaodong Bay, Bohai Basin

ZUO Yin-Hui1,2,QIU Nan-Sheng1,2,LI Jian-Ping3,GUO Yong-Hua3, LI Cui-cui1,2,CHANG Jian1,2   

  1. 1State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing102249, China;
    2Research Center for Basin and Reservoir, China University of Petroleum, Beijing102249, China;
    3 Tianjin Company, CNOOC, Tanggu, Tianjin300452, China
  • Received:2009-01-05 Revised:2009-03-07 Online:2009-08-20 Published:2011-12-21
  • About author:左银辉, 男, 博士研究生, 1980年出生,石油地质学专业, 主要从事沉积盆地构造—热演化和油气成藏机理方面的研究。E-mail: zuoyinhui@tom.com。

摘要:

古近系是辽东湾地区的主力烃源岩层系, 包括孔店组(Ek)—沙河街组四段(Es4)、沙河街组三段(Es3)、沙河街组一、二段(Es1-2)、东营组三段(Ed3)4套烃源岩, 它们主要分布在该地区的3个凹陷(辽西、辽中和辽东)的各个次洼中。在沉积和构造发育史的基础上, 结合烃源岩地球化学和热史等参数对烃源岩成熟演化进行模拟。对辽中凹陷各洼陷典型井区的烃源岩演化模拟表明辽中凹陷不同洼陷内各烃源岩层系的成熟演化历史存在明显差异:在东营组沉积末期,Es4-Ek烃源岩普遍进入生油门限,现今,基本上处于高—过成熟阶段;在馆陶组沉积末期,Es3和Es-2烃源岩普遍进入生油门限,Ed3烃源岩部分进入生油门限,现今,Es3和Es-2烃源岩在辽中凹陷的部分地区达到生油高峰期。同时, 利用Basinview软件模拟了辽东湾地区古近系4套烃源岩的成熟演化历史, 表明在盆地演化过程中同一套烃源岩在辽东湾地区不同凹陷进入生油门限和达到生油高峰及生气阶段的时间存在差异。研究成果可以为该地区深凹区的烃源岩预测与评价和计算烃源岩体积、生、排烃量等提供重要参数,这对指导该地区的油气资源勘探具有重要意义。

关键词: 辽东湾地区, 古近系, 烃源岩, 成熟度, 镜质体反射率

Abstract:

The main source rocks is Paleogene, including Kongdian Formation (Ek )-Member 4 of Shahejie Formation ( Es4 ), Member 3 of Shahejie Formation( Es 3 ), Member 1-2 of Shahejie Formation(Es-2) and Member 3 of Dongying Formation (Es3) in Liaodong Bay, Bohai Basin. They are mainly distributed in several sub-sags in three sags (Liaoxi, Liaozhong and Liaodong) in the region.  Based on the depositional  and tectonic development history, with combination of  geochemical and thermal parameters, etc, maturity evolution of source rock is modeled. The results of typical wells show that it exhibits an  obvious difference among sub-sags in Liao zhong sag. The maturity evolution history modeled by Basinview software also shows that there are different times to reach thresholds of oil generation and oil generation peak and gas generation phases for the same set of source rock in different sags: Es4-Ek source rocks entered threshold of oil generation during the end of Dongying Formation deposition period generally and they are up to high-over maturity phase now; Es 3、Es -2 and part of Ed3 source rocks entered threshold of oil generation during the end of Guantao Formation deposition period generally, Es3 and Es -2   source rocks are up to oil generation peak phase in part of Liaozhong sag now. The results of this paper can provide important parameters in prediction and evaluation of source rock, calculation of volume of source rock, and the amount of hydrocarbon generation and expulsion, thus it has a guiding significance for petroleum exploration in this region.

Key words:  , Liaodong Bay, Paleogene, source rock, maturity, vitrinite reflectance

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