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  

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

作　　者：陈斌[1] 蔡雄飞[1] 冯庆来[1] 顾松竹[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《沉积与特提斯地质》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

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.

关 键 词：生物多样性 沉积特征 烃源岩 大隆组 四川广元 

分 类 号：P512.2[天文地球—地质学]