松辽盆地东南隆起区-中央坳陷区上白垩统青山口组一段油页岩特征对比分析  

Upper Cretaceous Qingshankou Formation First Member Oil Shale Features Comparative Analysis in Southeast Uplift-Central Depression, Songliao Basin

作　　者：张帅华 刘招君[1,2] 申林 张朋霖 孟庆涛 Zhang Shuaihua;Liu Zhaojun;Shen Lin;Zhang Penglin;Meng Qingtao(College of Earth Sciences,Jilin University,Changchun,Jilin 130061;Jilin Provincial Key Laboratory of Oil Shale and Paragenetic Energy Minerals,Changchun,Jilin 130061)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林省油页岩及共生能源矿产重点实验室,长春130061

出　　处：《中国煤炭地质》2021年第4期25-34,共10页Coal Geology of China

基　　金：中国地质调查局油气资源中心项目“全国油页岩地质调查与评价”。

摘　　要：在岩心观察和测试数据分析基础上,对松辽盆地东南隆起区和中央坳陷区青山口组一段油页岩的岩石学特征、工业品质特征、有机地球化学特征和生物标志化合物特征进行对比分析。结果表明:研究区油页岩为高灰分、低硫、中等—低品质油页岩;油页岩有机质类型主要为Ⅰ型干酪根,有机质来源主要为藻类体,其中东南隆起区油页岩中陆源有机质含量和有机质丰度相对较高,有机质成熟度相对较低;东南隆起区油页岩埋深相对较浅,油页岩单层厚度和累积厚度相对较大;东南隆起区和中央坳陷区油页岩的碳优势指数(CPI)平均值分别为1.25和1.13,表明中央坳陷区油页岩的奇碳数优势相对较小,成熟度相对较高;甾类/藿类比值分别为0.94和0.22,C 27/C 29比值分别为1.00和0.97,表明东南隆起区油页岩中的湖生藻类体的优势相对较高;Pr/n-C 17与Ph/n-C 18交会图表明中央坳陷区油页岩沉积水体的还原性比东南隆起区更强;C 31αβ22S/(22S+22R)藿烷的平均值分别为0.46和0.53,表明东南隆起区油页岩成熟度相对较低;伽马蜡烷指数平均值分别为0.40和0.27,表明东南隆起区油页岩水体盐度相对更高。前人对深层油页岩的研究较少,本次通过对研究区浅层和深层油页岩的特征对比分析,揭示研究区油页岩特征和沉积环境的差异并探讨造成这种差异的成因,对研究区油页岩的勘探与开发具有一定的指导意义。Based on rock core observation and tested data analysis have carried out comparative analysis for Qingshankou Formation First Member oil shale petrological,industrial quality,organic geochemical and biomarker chemical compound features in the southeast uplift-central depression of the Songliao Basin.The result has shown that oil shale in the study area has high ash,low sulfur,medium to low quality.Organic matter type of oil shale mainly belongs to type I kerogen,organic matter source is mainly from alginate.In which,in oil shale from southeast uplift,organic matter content and abundance are higher relatively,maturity relatively low;buried depth relatively shallower,single layer and cumulative thicknesses relatively large.Carbon preference index(CPI)mean in southeast uplift and central depression is 1.25 and 1.13 respectively,indicated oil shale in central depression has relatively smaller odd carbon number dominance and relatively higher maturity;steranes/hopanes ratio of the two areas is 0.94 and 0.22 respectively;C 27/C 29 ratio is 1.00 and 0.97 respectively,indicated southeast uplift lacustrine alginate dominance relatively high;the cross plot of Pr/n-C 17 and Ph/n-C 18 shows that the reducibility of oil shale sedimentary water in the central depression is stronger than that in the southeast uplift;C 31αβ22S/(22S+22R)hopane mean is 0.46 and 0.53 respectively,indicated oil shale maturity relatively lower in southeast uplift;gammacerane index is 0.40 and 0.27 respectively indicated oil shale water body salinity in southeast uplift relatively higher.The study on deep oil shale is less,on their basis has carried out comparative analysis for study area shallow and deep oil shale characteristics,revealed differences in oil shale features and sedimentary environment and discussed the causation of differences. The study has certain guiding significance on oil shale exploration and exploitation in the area.

关 键 词：青山口组一段 油页岩特征 形成环境 松辽盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]