Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (3): 348-355.doi: 10.11743/ogg20060309

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Study on capability of hydrocarbon generation and expulsion from marine carbonate source rocks

Qin Jianzhong1, Liu Baoquan2, Zheng Lunju1, Zhang Qu1   

  1. 1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151;
    2. Research Institute of PetroleumExploration and Development, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552
  • Received:2006-03-03 Online:2006-06-25 Published:2012-01-16

Abstract:

Based on selection and comparison of 5000 marine source rock samples of various types,34 samples acquired from Jurassic in Qinghai-Tibet plateau,Upper Proterozoic in northern Hebei province and Devonian in Luquan of Yunnan province have been selected for artificially watering,heating and pressurizing simulation experiment.Comprehensive study shows that the marine carbonate rock has relatively higher accelerating effect on hydrocarbon generation from kerogen and expulsion in comparison with marine mudstone and shale,lowers the temperature of peaks of total oil generation and expulsion,and easily forms immature-low-mature heavy oil,resulting in increasing oil expulsion efficiency,and enlarging yields of total gas,CO2,H2,total oil,oil carried by gas,residual oil,hydrocarbon gas and total hydrocarbons.All these are related to the catalytic reaction of α-carbon atom forming free radical,the relatively high content of planktonic algae in kerogens of carbonate rocks,and the weak adsorption of carbonate rock to organic matter and hydrocarbons.However,calcareous mudstone and shale,with carbonate content in the range of 5%-25%,relatively have the highest yields of hydrocarbons including total oil.They are mainly formed in closed and strong reduction environments and have good kerogen type and high abundance of organic matter.

Key words: source rock, capability of hydrocarbon generation and expulsion, simulation experiment, marine facies, carbonate rock

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