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Thermal Evolution History Analysis of Source Rocks of Hefei Basin

ZHANG Yong1,2 CAO Xue-qing1,2 REN Feng-lou3 MENG Xiang-jun1,2(1.Key Laboratory of Marine Hydrocarbon Resources and Environment Geology,Ministry of Land and Resources,Qingdao Shandong 266071;2.Qingdao Institute of Marine Geology,Qingdao Shandong 266071;3.Insitute of Geological Science,Shengli Oilfield,SINOPEC,Dongying Shandong 257015)  
Based on vitrinite reflectivity analysis,paleogeotemperature inversion and X ray diffraction series of the smallest granule illite crystallinity,this paper has analyzed thermal evolution of source rock since Carboniferous-Permian.The result indicates that 1:Carboniferous-Permian source rock was in high maturity,entered threshold of oil generation after the lower Jurassic deposition.After the upper Jurassic,paleogeotemperature was up to 245℃.2:Fanghushan Formation of the lower Jurassic was also in higher maturity,entered threshold of oil generation after the middle Jurassic,maximal paleogeotemperature up to 260℃ after the middle Cretaceous.3:Middle-upper Jurassic enter threshold of oil generation at lower Cretaceous.Its maximal paleogeotemperature up to 225℃ and 230℃ after Zhuxiang Formation.4:Maximal paleogeotemperature of Zhuxiang Formation up to 110-120℃ at the end of the early Cretaceous 5:.Dingyuan Formation of paleogene is immature,maximal paleogeotemperature less than 50℃ after Dingyuan Formation deposition.
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