Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia  

作　　者：Xiao-Wei Zheng Niels-HSchovsbo Lei-Bo Bian Arka Rudra Hamed Sanei 

机构地区：[1]Lithospheric Organic Carbon(LOC)Group,Department of Geoscience,Aarhus University,8000,Denmark [2]Department of Reservoir Geology,Geological Survey of Denmark and Greenland(GEUS),Oster Voldgade 10,Dk-1350,Copenhagen K,Denmark [3]Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

出　　处：《Petroleum Science》2023年第5期2637-2647,共11页石油科学（英文版）

摘　　要：This work used organic geochemistry and organic petrology to study the depositional environment,organic matter characteristics,and thermal maturity of the Cambrian-Ordovician organic-rich marine shales in the Baltic Basin.The main macerals in Cambrian samples include alginite,bituminite and solid bitumen,while zooclastic macerals become the major proportion of organic matter in the Ordovician samples.As the maturity increase,solid bitumen becomes abundant and dispersed.Semifusinite-like maceral was observed only in Furongian of well DBH15/73,which probably indicates the local intrusion of Permo-Carboniferous dolerite dikes.The programmed pyrolysis results show that immature,early mature,and over-mature samples are developed.However,the data of high-uranium Furongian samples were greatly altered by igneous intrusives from local dikes.HIo calculation model is simulated based on pyrolysis data and fitted according to the least-square fitting method.The simulated fitting HIo:400mg HC/g TOC(369.5 mg HC/g TOC,430.5 mg HC/g TOC as 95%confidence bounds)is within the worldwide marine shale HI_(o)and indicates a marine anoxia and transgressive sea with shallow water column(organofacies B).

关 键 词：Lower paleozoic Organic petrology Initial hydrogen index Original geochemical properties 

分 类 号：P618.13[天文地球—矿床学]