罗子沟盆地大砬子组油页岩有机地球化学特征及其地质意义  

Organic geochemical characteristics and geological significance of oil shales in Dalazi Formation of Luozigou Basin

作　　者：刘冬青[1] 柳蓉[1,2] 刘招君[1,2] 胡晓峰[1] 孙平昌[1] 杨小红[1] 徐银波[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学东北亚生物演化与环境教育部重点实验室,长春130026

出　　处：《世界地质》2012年第2期315-322,共8页World Geology

基　　金：全国油气资源战略选区调查与评价国家专项(2009GYXQ11);高等学校博士学科点专项科研基金(新教师基金课题)(200801831098);国家自然科学基金(40972076);吉林省科技发展计划(青年科研基金)(20090167);吉林大学科学前沿与交叉学科创新项目(200903035)及吉林大学创新团队建设项目(201004001)联合资助

摘　　要：通过对罗子沟盆地大砬子组上段油页岩干酪根镜检、热解、GC和GC-MS等分析,并对其有机地球化学多项特征参数进行研究,讨论罗子沟油页岩有机地化特征及其地质意义。根据姥植比及伽马蜡烷、孕甾烷、重排甾烷、重排藿烷等参数特征分析,推测油页岩形成的古湖泊水体性质为淡水--微咸水的还原沉积环境。综合分析显微组分镜检和热解结果及甾烷(C27-C29)分布等参数,认为研究区油页岩有机质主要为混合母源输入。依据热解、Ro、甾烷和C31升藿烷异构化程度、C29莫烷/C29藿烷、Ts与Tm相对含量比值等指标的对比,指出研究区油页岩处于未熟-低熟热演化阶段。The authors studied the organic geochemical parameters of oil shales from upper Dalazi Formation of Luozigou Basin by kerogen microscopy, rock-pyrolysis, GC and GC-MS analysis, and discussed the organic geochemical characteristics and geological significance of oil shales in Luozigou Basin. Oil shales were formed under sedimentary environment of fresh-slight saline water reduction, based on the analysis of some patameters including Pr/Ph ratio, gammacerane, pregnane, diasterane and diahopane. Comprehensive analysis of maceral microscopy, rock-pyrolysis and sterans （C27-C29） distribution showed that the oil shales organic matters were mixed source input in the studied area. Rock-pyrolysis, Ro, isomerized degree of sterane and C31 homoterpane, C29 morparle/C29 hopane, and Ts/Tm showed that the oil shales were immature to low mature in their evolutionary stage.

关 键 词：罗子沟盆地 大砬子组 油页岩 有机地球化学 地质意义 

分 类 号：P618.12[天文地球—矿床学]