Formation Mechanism of High Quality Marine Source Rocks—Coupled Control Mechanism of Geological Environment and Organism Evolution

• Published in: Journal of earth science (Wuhan, China) Vol. 22; no. 3; pp. 326 - 339
• Main Author: 腾格尔 胡凯 孟庆强 黄娟 付小东 谢小敏 仰云峰 高长林
• Format: Journal Article
• Language: English
• Published: China University of Geosciences China University of Geosciences 01.06.2011; Springer Nature B.V
• Subjects: Biogeosciences; Cambrian; Chemical speciation; Earth and Environmental Science; Earth science; Earth Sciences; Evolutionary biology; Geochemistry; Geology; Geotechnical Engineering & Applied Earth Sciences; Marine environment; Molybdenum; Organic matter; Organisms; Rocks; Spatial analysis; Speciation; Trace elements; 品质; 地球动力学背景; 地质环境; 形成机理; 控制因素; 机制; 海相烃源岩; 生物演化; organic evolution; high quality marine source rock; speciation analysis; geological environment; forming mechanism; geodynamics
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-011-0185-6

High quality marine source rock （HQMSR） is the key prerequisite for medium to large hydrocarbon accumulations. However, the forming mechanism remains unclear. On the basis of the in-vestigation for the geodynamic setting of the Middle-Upper Yangtze during the Early Cambrian in dif-ferent spatial scales and the analysis of trace elements, the main controlling factors of the development of high quality marine source rock are discussed, with specific consideration of the burial rate of the organic matter. The formation of high quality marine source rocks is suggested to be the result of a co-ordinated development and the interaction between geological environments and organism evolution during the major geological transition periods. We perceived that the burial rate of organic matter was influenced by the primary productivity and its burial conditions. The abundance of autogenetic molyb-denum gained directly by the chemical speciation analysis of rocks could be used as a proxy for the burial organic matter. The burial rate of autogenetic molybdenum and the sedimentary organics in modern marine environments could be used to estimate the sedimentary organics in ancient environ-ments effectively.