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GEOCHEMICAL BOUNDARIES CONSTRAINT ON PETROLEUM DISTRIBUTION OF GLOBAL AND EAST ASIAN BORDER SEA

ZHU Bingquan(CAS Key Laboratory of Isotope Geochronology and Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China)  
The global mapping results of Pb isotopes show that there are transition zones between DUPAL anomaly and NHRL(north hemisphere reference line)(Δ8/4=20-45),which control the distribution of 96% crude oil and 90% nature gas of proved reserves.Based on this distribution pattern,2/3 petroleum resources in the world are not discovered or explorated.The North China craton margins indicated by the geochemical boundaries from continent to sea are also an important factor constraining on oil and gas distribution in North China and the Bohai Sea.The oil field of East China is located on the stretched line of the Cathysian-Yangtze geochemical boundary from Zhejiang to Japan.The oil fields in the South China Sea are located on the transition zone between DUPAL anomaly and NHRL,and also controlled by the changeable geochemical boundaries between the Cathysian and Idochina blocks from continent to ocean.Thus there are potential for finding large oil fields in the South China Sea.
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