【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。更多还原

【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.更多还原