Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (4): 505-511.doi: 10.11743/ogg20050418

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Thermal evolution and reservoiring history in Qikou sag,Huanghua depression

Zhang Jie1,2, Qiu Nansheng1,2, Wang Xin3, Duan Jiankang3   

  1. 1. Key Laboratory of Hydrocarbon Accumulation, Ministry of Education, Beijing;
    2. Basin & Reservoir Research Center, China University of Petroleum, Beijing;
    3. Exploration and Development Research Institute, Dagang Oilfield Company, Dagang, Tianjin
  • Received:2005-05-27 Online:2005-08-25 Published:2012-01-16

Abstract:

Thermal histories of 24 wells in Qikou sag are simulated by using vitrinite reflectance data.The simulation results show that the geothermal gradients are about 5.0~ 5.6℃/100 m during the deposition of Shahejie Fm,4.5~5.0℃/100 m during the deposition of Dongying Fm,and 3.5~4.5℃/100 m during the deposition of Guantao Fm,respectively.The current geothermal gradient is measured to be about 3.1~3.2℃/100 m.Based on the homogenization temperatures of fluid inclusions,the restored burial history of core samples,and the thermal evolution and hydrocarbon generation histories of source rocks,there are two hydrocarbon charging stages in the study area.The first charging stage occurs at the end of deposition of Dongying Fm;the second charging stage extends from the end of deposition of Guantao Fm to present time,and is the main charging stage of hydrocarbons in Qikou sag.Hydrocarbon migration and accumulation modeling with PRA 2D simulation software also show that there are two hydrocarbon accumulation peaks in Qikou sag,with the first one at the end of deposition of Dongying Fm and the second one from the end of deposition of Guantao Fm to present time.

Key words: Qikou sag, thermal history, hydrocarbon entrapment, fluid inclusion, basin modeling

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