西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

四川盆地陆相烃源岩成熟史及生排烃史

冯动军1,2 *,肖开华1,2   

  1. 1. 中国地质大学(北京)地球科学与资源学院,北京海淀100083
    2. 中国石油化工股份有限公司石油勘探开发研究院,北京海淀100083
  • 出版日期:2015-04-01 发布日期:2015-04-01
  • 通讯作者: 冯动军,E-mail:fengdj.syky@sinopec.com
  • 基金资助:

    国家重大专项(2008ZX05002 – 004 – 005)。

Mature and Hydrocarbon Generation-expulsion Histories of Terrestrial
Faces Source Rock in Sichuan Basin

Feng Dongjun1,2*, Xiao Kaihua1,2   

  1. 1. School of Earth and Resources,China University of Geoscience(Beijing),Haidian,Beijing 100083,China
    2. Exploration and Production Research Institute,SINOPEC,Haidian,Beijing 100083,China
  • Online:2015-04-01 Published:2015-04-01

摘要:

为了综合评价四川盆地陆相烃源岩,应用含油气盆地数值模拟技术,定量恢复了研究区主要烃源岩层系的成
熟和生排烃史。首先,分别建立了盆地的热力学、生烃动力学模式、机制及相关地质模型,其次,选取古热流值、沉积
水表面温度、古水深作为模拟参数,对四川盆地重点研究区20 多口井进行了模拟。研究表明:四川盆地陆相系烃源岩
具有3 个生烃高峰期和两个排烃高峰期,成熟及生烃史总体表现为“分区演化、差异成熟、西早东晚”。层位上须三、
须五段生、排烃量较大,其次为下侏罗统和须一段,总的排烃效率以须一段和须五段较高。平面上川西地区生烃量最
大,其次为川北—川东北地区和川中地区。研究认为:以须家河组和中、下侏罗统为烃源岩的油气系统分别是川西地
区和川北—川东北地区油气勘探的主要目标。

关键词: 四川盆地, 须家河组, 侏罗统, 烃源岩, 成熟史, 生烃史, 排烃史

Abstract:

In order to evaluate terrestrial faces source rock in Sichuan Basin,we quantitatively recovered the mature and hydrocarbon
generation-expulsion histories of the main hydrocarbon source in research area by the numerical simulation technology
of oil and gas bearing basin. First,we established the thermodynamic,hydrocarvon-generation dynamic model,mechanism
and geologic model of the basin. Then,we simulated more than 20 wells in the important areas of the basin with ancient
heat flow,sediment water interface and paleobathymetric data being input parameters. The results show that terrestrial faces
source rock in Sichuan Basin have three hydrocarbon-generation peaks and two hydrocarbon-expulsion peaks. The character of
mature and hydrocarbon-generation histories can be summarized as subregion evolution,diversity maturation and west earlier
than east. The quantity of hydrocarbon generation-expulsion in Segment 3 and 5 Xujiahe Formation is that in lower Jurassic
and 3 segment Xujiahe Formation. Total hydrocarbon-expulsion efficiency in 1 and 5 segment Xujiahe Formation is higher
than that of others. The quantity of hydrocarbon-generation in western Sichuan is the biggest in Sichuan Basin,followed by
that in northern – northeastern and middle Sichuan. The conclusion is that the areas of hydrocarbon source rock for oil and gas
system in Xujiahe Formation and in middle-lower Jurassic are major targets in gas exploration in western Sichuan region and
northern-northeastern Sichuan Basin.

Key words: Sichuan Basin, Xujiahe Formation, Jurassic, hydrocarbon source rock, mature history, hydrocarbon-generation
history,
hydrocarbon-expulsion history