Organic Geochemical Characteristics And The Metallogenic Relationships Between The Paleo-oil Reservoir And Qinglong Antimony Deposit,Guizhou Province,China

Guizhou Qinglong antimony deposit is one of the main antimony deposit in southern China.The formers discovered a paleo-oil reservoir in drilling process of Shaziling area,next to the Qinglong antimony deposit,and the close spatial connection between the paleo-oil reservoir and the antimony deposit.Based on the experimental data of organic geochemistry of the sample from both paleo-oil reservoirs and Devonian strata,the organic geochemical characteristics of the reservoirs were analyzed and the oil source correlation and hydrocarbon source rocks were evaluated.Mineralization and the relationship between the paleo-oil reservoirs were discussed.There were 15 layers of asphalt can be seen in the drill core.Asphalt is mainly distributed in the cracks,porosity and caves of the Permian strata.This study based on the experimental data of 5 samples of the paleo-oil reservoirs,and 7 samples from Devonian strata,including asphalt reflectance,carbon isotope,rock pyrolysis,organic carbon,organic elements,pyrethroid identification,saturated hydrocarbon chromatography,biomarker compounds and other projects,obtained a large number of organic geochemical data.Comprehensive assessment and organic matter evaluation has been made,combined with previous inorganic geochemical analysis results.Qinglong Antimony ore asphalt belongs to carbonaceous asphalt,which is formed by pyrolysis of paleo-ground temperature.The history of thermal evolution of the basin and the history of are analyzed.Geological features and previous research results,the paleo-oil reservoirs and Devonian source rocks comparison carried out a more in-depth discussion.Comprehensive Qinglong antimony ore data analysis of the ancient reservoirs and metal antimony mineralization relationship is:Crude oil formed in Emeishan basalt strata as a reservoir,after a series of geological effects accompanied by an increasion in depth,before the gradual generation of crude oil gradually become the hydrocarbon gas.From the oil reservoir gas is mixed with the ore-forming fluid and reacts with the ore-forming fluid.It is presumed that the reaction is thermochemical reduction of sulfate(SO42-),antimony ore Mineralization provided the required S2-.The author also combines the analysis data of sulfur isotope of pyrite in the asphalt of the ancient oil reservoir,and realized that the organic matter of the oil and gas reservoir is the sulfur source of pyrite.