四川广元长江沟大隆组的沉积特征及与烃源岩关系的研究

基金项目:

国家自然科学基金(40839903)资助

详细信息

The Dalong Formation section in Changjianggou,Guangyuan,Sichuan: Sedimentary characteristics and their bearings on the source rocks

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China

摘要: 四川广元长江沟上二叠统大隆组是以灰岩为主夹泥岩的沉积类型,生物群组合面貌十分丰富,沉积特征以还原、低能、低速、缺氧为特点。根据生物群组合面貌和沉积特征,其形成环境应为较深"浅水",而并非"半深海"。本区大隆组由于生物多样性和始终处于特殊的斜坡和缺氧环境,具有优质烃源岩特征,有机碳平均含量达5%,是四川今后寻找油气的有效标志层。
- 生物多样性 /
- 沉积特征 /
- 烃源岩 /
- 大隆组 /
- 四川广元
Abstract: The Dalong Formation section in Changjianggou,Guangyuan,Sichuan is characterized by limestones intercalated with mudstones,abundant biotic assemblages and deeper shallow-water environments indicated by reduction,low energy,low velocity and oxygen depletion. The bio-diversity and anoxic slope environments made the study area to be favourable for the formation of excellent source rocks,with the average organic carbon contents almost up to 5%,and thus may be potential marker horizons for future petroleum exploration in Sichuan.
- bio-diversity /
- sedimentary characteristics /
- source rock /
- Dalong Formation /
- Guangyuan in Sichuan