Occurrence of Highly Mature Organic Matter in Marine Black Shale Petroleum Source Rocks of Basal Cambrian from Northern Tarim Basin, China

• Published in: Acta geochimica Vol. 23; no. 2; pp. 148 - 154
• Main Author: 于炳松 HailiangDONG 陈建强 陈晓林 梁世友
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.04.2004; The Key Laboratory of Lithosphere Tectonics and Exploration of the Ministry of Education,China University of Geosciences,Beijing 100083,China%Department of Geology,Miami University,Oxford,OH 45056,USA
• Subjects: Cambrian; Carbon; Clay minerals; Continental margins; Geochemistry; Interlayers; Minerals; Oil shale; Organic carbon; Organic matter; Particulates; Petroleum; Rocks; Sediment; Sedimentary rocks; Sediments; Shale; Shales; Total organic carbon; 地层学; 塔里木盆地; 寒武纪; 岩石学; 沉积学; China; Tarim Basin; China, People's Rep., Xinjiang, Tarim Basin; China, People's Rep; occurrence of highly mature organic matter; marine black shale petroleum source rock; Tarim Basin
• ISSN: 1000-9426; 2096-0956; 1993-0364; 2365-7499
• DOI: 10.1007/BF02868978

More and more evidence indicates that organic matter (OM) in immature organicrich sediments and sedimentary rocks is chemically adsorbed onto the outer surfaces of minerals and into interlayer (inner) surfaces of smectitic clay minerals in the form of amorphous molecular-scale carbon. But there have been few reports about the occurrence of highly mature OM in marine black shales ( petroleum source rocks ). The occurrence of highly mature OM in the black shales of basal Cambrian from northern Tarim Basin is studied in this paper. Based on the comprehensive analyses of total organic carbon contents (TOC) , maximum thermolysis tempera tures ( Tmax ) of OM, mineral surface areas (MSA) ,and scanning electronic microscopic (SEM) and transmission electronic microscopic (TEM) observations of the black shales, it is concluded that the highly mature OM in the marine black shales of the basal Cambrian from northern Tarim Basin occurs in particulates ranging in size from 1 to 5 μm in diameter. Through the contrast of the occurrence of the highly mature OM in the black shales with that of the immature ones in modern marine continental margin sediments, some scientific problems are proposed, which are worth to study further in detail.