Revisiting Rhenium-Osmium Isotopic Investigations of Petroleum Systems: From Geochemical Behaviours to Geological Interpretations  

作　　者：Shao-Jie Li Xuan-Ce Wang Simon A.Wilde Zhuyin Chu Chaofeng Li Sheng He Keyu Liu Xingzhi Ma Yuxiang Zhang 

机构地区：[1]School of Earth Sciences,Yunnan University,Kunming 650500,China [2]The School of Earth Science and Resources,Chang'an University,Xi'an 710054,China [3]ARC Centre of Excellence for Core to Crust Fluid Systems and The Institute for Geoscience Research,Department of Applied Geology,Curtin University,Perth 6845,Australia [4]State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [5]Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China [6]School of Geosciences,China University of Petroleum(Huadong),Qingdao 266555,China [7]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [8]Australise Resources and Environment Solutions,Wattle Grove,Perth 6107,Australia

出　　处：《Journal of Earth Science》2021年第5期1226-1249,共24页地球科学学刊（英文版）

基　　金：This study was supported by the Research Start-up Project for Introduced Talent of Yunnan University(No.20190043);the CNPC Key Laboratory of Carbonate Reservoirs Innovation Fund(No.RIPED-2020-JS-51020)。

摘　　要：Recent decades have witnessed an increasing number of studies investigating petroleum systems with the application of rhenium-osmium(Re-Os) isotopic geochemistry. Here, we review the use of the 187 Re-187 Os geochronometer with respect to the geochemical behaviour of rhenium and osmium in hydrocarbon-related geological processes. The Re-Os budget in hydrocarbon source rock predominantly originates from natural water columns during its deposition. Open seawater tends to have a homogeneous Os isotopic composition because its residence time in seawater is longer than the time taken for ocean mixing. On the contrary, restricted water bodies(e.g., lakes) may have heterogeneous Os isotopic compositions due to the greater amount of terrigenous input. Hydrogenous Re and Os atoms are sequestered from the water body into sedimentary organic matter and transferred into crude oil through thermal maturation of organic matter. Thermal maturation likely does not significantly alter the Re-Os isotopic systematics of the source rock as a Re-Os isochron age of 442±21 Ma(2σ) is yielded in this study for over matured source rocks within the Silurian Longmaxi Formation from the Sichuan Basin. Re-Os atoms are mainly hosted by the highly polar/aggregating/aromatic asphaltenes in hydrocarbons, possibly chelating with organic complexes or occurring as metalloporphyrins. Resin and aromatic hydrocarbons also contribute to the Re-Os budget, but are 2 to 3 orders of magnitude lower than that of asphaltenes, whereas saturates do not contain appreciable Re-Os contents. The distribution of Re-Os atoms in hydrocarbons is heterogeneous because the duplicate analysis of pure single bitumen samples yields similar ^(187)Os/^(188)Os ratios whereas variable ^(187)Re/^(188)Os ratios. The Re-Os system in crude oils can be reset during transport away from the source rocks, with Os-rich organic fractions more readily expelled than Re-rich fractions. Contact with metal-rich fluids(e.g., hydrothermal fluid) or compositional changes related to asphaltene c

关 键 词：Re-Os isotope system petroleum system investigation geochemical behaviour of Re and Os in petroleum system 

分 类 号：P618.13[天文地球—矿床学]