Gas-water identification of carbonate reservoir based on log mean difference of T2 spectrum

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  • 1.Key Laboratory of Exploration Technologies for Oil and Gas Resources of Education Ministry,Yangtze University,
    Wuhan 430100,China;
    2.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

Received date: 2016-06-05

  Revised date: 2016-09-15

  Online published: 2017-08-10

Abstract

Identification of gas and water is a key problem in gas reservoir logging evaluation,and a method for identifying gas water by using T2 spectral center location difference under different observation modes is proposed.Theoretical analysis shows that the change of the T2 spectrum center position can be changed by changing measurement mode,and the natural gas is more sensitive than the formation water.Based on the theory,gas-water recognition software is developed,and tested in Sichuan Basin.The result is confirmed by the oil testing conclusion,and the validation of the method is demonstrated.The method is applied in several wells,and results show that the method has good recognition effect.And we also found that recognition accuracy of different echo interval mode is higher than that of different waiting time mode.

Cite this article

Zhang Gong,Feng Qing-fu,Wu Hong-liang,Wang Ke-wen,Feng Zhou . Gas-water identification of carbonate reservoir based on log mean difference of T2 spectrum[J]. Natural Gas Geoscience, 2017 , 28(8) : 1243 -1249 . DOI: 10.11764/j.issn.1672-1926.2016.11.008

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