LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (6): 15-22.doi: 10.3969/j.issn.1673-8926.2015.06.003

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Geochemical characteristics of organic-rich shales of the second member of Kongdian Formation in Cangdong Sag, Huanghua Depression

Liu Xiaoping 1,Liu Qingxin 1,2,Liu Jie 1,Dong Qingyuan 1,3,Guan Ming 1,Li Hongxiang 2   

  1.  1. College of Geosciences , China University of Petroleum , Beijing 102249 , China ; 2. Research Institute of Petroleum Exploration and Development , PetroChina Dagang Oilfield Company , Tianjin 300280 , China ; 3. Sinopec Geophysical Research Institute , Nanjing 211103 , China
  • Online:2015-12-20 Published:2015-12-20

Abstract:

The organic-rich shales of the second member of Kongdian Formation (Ek2) are developed very well in Cangdong Sag, Huanghua Depression. Research on geochemical characteristics of the shales is highly significant for the shale oil resource evaluation. Based on collecting and sorting the research results of predecessors, additional core samples were taken to carry out tests and analysis of organic carbon, rock pyrolysis, chloroform bitumen “A”, kerogen maceral and vitrinite reflectance. Single well numerical simulation of burial and thermal history and geochemical evolution sections were also
studied. Organic-rich shales of Ek21, Ek22 and Ek23 were all evaluated as the best source rocks. The types of organic matterare mainly of ⅠandⅡ1 , with small amount of Ⅱ2 and Ⅲ. Immature to low mature shales are mainly distributed in central uplift zone, while the organic-rich shales in slope zones are at low maturity to maturity stage. The organic-rich shales of Ek2 began to generate and expulse immature to low mature hydrocarbon in early Eocene and reached the peak in the late sedimentary period of Guantao Formation. Then with being continuously buried deeply, the source rocks could entered into
low mature to mature hydrocarbon generation stage and the conversion rates of hydrocarbon generation is as high as 60%.

Key words:  fluid inclusion , fracture zone , oil and gas enrichment , Yingmai-2 area , northern uplift of Tarim Basin

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