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The Effect of Water Medium on the Products of Different Pyrolysis System

SUN Li-na，ZHANG Ming-feng，WU Chen-jun，XIONG De-ming，SU Long，TUO Jin-cai   

  1. 1.Key Laboratory of Petroleum Resources Research,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
  • Received:2014-07-15 Revised:2014-10-05 Online:2015-03-10 Published:2015-03-10

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Abstract:

In order to further clarify the role of water in the evolution of organic matter,we summarize the effect of water in different pyrolysis system.The development of hydrocarbon evolution and expulsion simulation experiment is open system→closed system→semi-open system.And at the same time,the medium of experiment has also changed from anhydrous to hydrous pyrolysis.In the above three pyrolysis systems,semi-open simulation system has been regarded as the process which is closer to the actual conventional geological evolution.As liquid water has different properties at different temperature and pressure,different state of liquid water will have different effects on the products of simulation experiment.For example,the temperature between room temperature and 100℃is called normal temperature water.High temperature liquid water ranges from 200℃ to 374.5℃.But after the critical temperature (T=374.5℃) and pressure (P=22.1MPa) point,the physical and chemical properties of water will have a big change.In general,in the closed system,the generation of gas hydrocarbon has a positive correlation with the added water,but when the amount of water has a percent between 20 and 50 on the rock sample,the yield of liquid hydrocarbon is the highest.But in the semi-open system,different states of water also have different properties.For example,the medium of high pressure water vapour improves the efficiency of gaseous hydrocarbon.And the critical water medium is conductive to the generation and preservation of liquid hydrocarbon.So clearly understanding how the liquid water affects pyrolysis products will have a significant implication.

Key words: Pyrolysis, Experimental system, Water, Water amount, High temperature high pressure liquid water, Water vapour

CLC Number: 

  • TE122.1+1

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