Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 34-42.doi: 10.3969/j.issn.1673-8926.2016.04.005

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Source rock characteristics and hydrocarbon generation kinetics: A case study of the Permian Lucaogou Formation in Jimusar Sag, Junggar Basin

Ji Hongjie1，2，Qiu Zhen3，Tao Huifei1，Ma Dongxu 1，2，Liao Peng4，Wang Qi1   

  1. 1. Key Laboratory of Petroleum Resources，Gansu Province/Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，Chinese Academy of Sciences，Lanzhou 730000，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. PetroChina Research Institute of Petroleum Exploraiton and Development，Beijing 100083，China；4. Geophysical Exploration Research Institute，Sinopec Jianghan Oilfield Company，Wuhan 430035，China
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

There are abundant petroleum resources in the Permian Lucaogou Formation in Jimusar Sag, Junggar Basin. The source rock types of the Lucaogou Formation include shale, carbonate shale and silty mudstone. These source rocks are characterized by high organic carbon content, high hydrocarbon generation potential, low maturity to maturity and Ⅰ-Ⅱ type kerogen. Based on conventional organic geochemistry evaluation of the source rocks, the source rock samples with low?middle maturity and high organic carbon content were selected to carry out pyrolysis and hydrocarbon generation kinetics simulation experiments under open system, and the haracteristics of the hydrocarbon generation and expulsion were studied. The results show that the reaction activation energy of the source rocks is 210 kJ/mol. The hydrocarbon generation and expulsion characteristics of the three kinds of source rocks are different. The shale has the highest hydrocarbon generation content and hydrocarbon expulsion rate, followed by carbonate shale, and the silty mudstone has the lowest hydrocarbon generation content and hydrocarbon expulsion rate. It is considered that the main driving force of the hydrocarbon expulsion and tight oil accumulation is the pressure increased by the hydrocarbon generation of source rocks in the Lucaogou Formation, and the shale and carbonate shale are the favorable targets for tight oil exploration.

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