摘要
咸化湖相沉积条件下形成的细粒沉积岩是我国页岩油勘探的热点层系。本文依据有机岩石学、扫描电镜、生烃动力学和高温高压加水热模拟实验,对准噶尔盆地吉木萨尔凹陷芦草沟组咸化湖相含有典型层状藻和结构藻的烃源岩的成烃特征进行对比研究。有机岩石学及扫描电镜观察表明两种藻类的赋存形式差异明显,结构藻的赋存形式主要为孤立分布特征,长度约为20~50μm;层状藻垂向上呈书页状叠置,水平延伸长。生烃动力学及高温高压热模拟实验结果指示了两种有机质的成烃过程具有明显的差异性,其中结构藻为主的烃源岩在较低成熟度就可以生成一定量烃类,随着演化程度的增加,生油速率缓慢,生油范围宽;层状藻为主烃源岩的生烃特征表现为集中生烃,生油窗范围窄且主要生烃活化能较高。该认识对于有效烃源岩评价和页岩油勘探层段与甜点区的选择均具有重要的启示和指导意义。
The fine grained sedimentary rocks formed under saline lacustrine conditions are a hot topic of shale oil exploration in China.In this study,based on organic petrology,scanning electron microscopy,hydrocarbon-generation kinetics and high-temperature and high-pressure thermal simulation experiments,the hydrocarbon generation characteristics of source rocks containing typical telalginite and lamalginite in the Lucaogou Formation in Jimusaer slag,Junggar basin were compared.The results of organic petrology and scanning electron microscopy showed that the form of occurrence the two kinds of algae is obviously different.Telalginite occurs as mainly isolated with a length of about 20~50μm.The lamalginite are stacked vertically,similar to pages,with longer horizontal length.Hydrocarbon generation kinetics and high temperature and high pressure thermal simulation experiments indicate that the hydrocarbon generation processes of the two kinds of organic matter are different to some extent.The source rock dominated by telalginite can have a certain hydrocarbon generation conversion rate at a lower maturity.With the increase in the degree of evolution,the oil generation rate is slow and the range of oil generation window is wide.The hydrocarbon generation characteristics of the source rocks dominated by lamalginite are concentrated hydrocarbon generation with narrow oil generation window and high distribution of main hydrocarbon generation activation energy.This work has important implications and guiding significance for the evaluation of effective hydrocarbon source rocks and the selection of shale oil exploration intervals and sweet spots.
作者
刘诗局
高岗
靳军
张莉莉
刚文哲
向宝力
王静
王明
LIU Shiju;GAO Gang;JIN Jun;ZHANG Lili;GANG Wenzhe;XIANG Baoli;WANG Jing;WANG Ming(College of Geosciences,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Experimental Testing Institute,Xinjiang Oil Field Company,Karamay,Xinjiang 834000,China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2023年第3期879-887,共9页
Acta Geologica Sinica
基金
中石油校企合作项目(编号ZLZX2020-01-06-03)资助的成果。
关键词
咸化湖相
层状藻
结构藻
生烃动力学
加水热模拟实验
saline lacustrine
telalginite
lamalginite
kinetics of hydrocarbon generation
hydrothermal simulation experiment
