Oil & Gas Geology ›› 2014, Vol. 35 ›› Issue (3): 336-341.doi: 10.11743/ogg20140306

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Comparison of hydrocarbon generation conditions between lacustrine and marine carbonate source rocks

Tian Chuntao1,2,3, Ma Suping1,2, Yang Yan1,2,3, Meng Jun4, Xia Yanqing1,2   

  1. 1. Gansu Provincial Key Laboratory of Petroleum Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Maxian Oil Plant, Qinghai Oilfield, PetroChina, Dunhuang, Gansu 736202, China
  • Received:2012-12-20 Revised:2014-05-15 Online:2014-06-08 Published:2014-07-11

Abstract:

The differences of hydrocarbon-generating conditions of lacustrine and marine carbonate source rocks were discussed in various aspects,such as the distribution characteristics,sedimentary environment,rock type,organic geochemical characteristics and hydrocarbon generation mode.The results show that marine and lacustrine carbonate source rocks all containe varying amounts of argillaceous components and are dominated by kerogen of typeⅠor type Ⅱ.In addition,there is no significant difference in occurrence of their organic matter,except for that lacustrine carbonate source rocks contain more amorphous organic matters.Organic carbon content of marine carbonate rocks is generally low,while that of lacustrine carbonate rocks is highly variable.The research of the hydrocarbon generation mode of lacustrine carbonate source rocks is still very weak in comparison with the marine carbonate source rocks,and the secondary hydrocarbon generation of the former should not be neglected.The formation conditions of lacustrine carbonate source rocks are controlled by many factors,the biogeochemical and sedimentological researches of lacustrine carbonate source rocks with high content of organic matters are especially important.Furthermore,the possibility of late hydrocarbon generation of lacustrine source rocks providing sufficient hydrocarbon sources for deep reservoirs of lacustrine faices is one of the important topics for future study.

Key words: lacustrine facies, marine facies, hydrocarbon generation condition, carbonate rock, source rock

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