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。
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.
出处
《沉积与特提斯地质》
CAS
CSCD
2015年第4期35-43,共9页
Sedimentary Geology and Tethyan Geology
基金
国家自然科学基金(40839903)资助
关键词
生物多样性
沉积特征
烃源岩
大隆组
四川广元
bio-diversity
sedimentary characteristics
source rock
Dalong Formation
Guangyuan in Sichuan
