Oil & Gas Geology ›› 2007, Vol. 28 ›› Issue (2): 274-279.doi: 10.11743/ogg20070220

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An analysis on pooling history of the Carboniferous thermal methane gas pool,eastern Sichuan basin

Li Yanxia Zhong Ningning1   

  1. 1. School of Petroleum Resources, Xi'an Shiyou University, Shaanxi 710065;
    2. Faculty of Natural Resources and Information Technology, China University of Petroleum, Beijing 102249
  • Received:2007-02-25 Online:2007-04-25 Published:2012-01-16

Abstract:

The formation process and charging history of the Carboniferous gas pools in eastern Sichuan basin are reconstructed through the study of hydrocarbon fluid inclusions from the secondary calcite vein in carbonate reservoirs.Besides gaseous hydrocarbons,liquid hydrocarbons,and saline inclusions,large quantity of multiphase inclusions exist in the present gas reservoirs.These fluid inclusions experienced an increase in their homogenization temperatures from 100℃~135℃ to 140℃~180℃,and to 185℃~220℃,and during the process,low temperature inclusions with low CH4 content evolved into high temperature inclusions with high CH4 content.The present gas reservoirs are the result of a process through which the ancient hydrocarbon reservoirs went through hydrocarbon generation,accumulation,destruction,and finally thermal cracking into gases.

Key words: charging episode, gaseous hydrocarbon inclusions, solid inclusion, oil cracking gas reservoir, Carboniferous, eastern Sichuan basin

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