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2015 , Vol. 26 >Issue 6: 1147 - 1155

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.06.1147

Mechanism and Effectiveness of Geochemical Index Trace Natural Gas Migration:A case Study of Jurassic Natural Gas in Western Sichuan Depression

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  • 1.College of Mining and Safety Engineering,Yibin University,Yibin  644000,China;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology,Chengdu 610059,China

Received date: 2014-07-22

  Revised date: 2015-01-05

  Online published: 2015-06-10

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Abstract

Analyzed the trace mechanism of the common tracer natural gas migration index,and took the Jurassic natural gas in western Sichuan Depression as an example to examine the trace effect.The results show that the CH4 content,N2 content and arene/alkane ratio have a better trace ability in the process of migration in different phase,which all are effective migration tracer index.However,the CO2 content and iC4/nC4 ratio are relatively poor in tracing gas migration.The CH4 content is the most effective trace index for the migration direction of natural gas,because it increas with the increasing of the migration distance under the different migration phase.Whether the N2 content or the arene/alkane ratio had the opposite changes in different migration phase,therefore it is need to fully consider the migration phase of natural gas when choosing the two tracer index.When gas migration phase is known,the two tracer indexes can determine gas migration direction;if gas migration direction is known,they can determine gas migration phase.When CO2 content in natural gas was greatly influenced by carbonate minerals,it is likely to lose the function of tracing gas migration.Whether the iC4/nC4 can trace natural gas migration and what is the trace mechanism,both are still more controversial,so choose it to trace gas migration should be carefully.

Key words： Natural gas migration; Trace index; Water-dissolving phase; Separate phase; Western Sichuan Depression

Cite this article

WANG Peng，LIU Si-bing，SHEN Zhong-min，HUANG Fei，ZHANG Wen-kai，ZOU Li-ming . Mechanism and Effectiveness of Geochemical Index Trace Natural Gas Migration:A case Study of Jurassic Natural Gas in Western Sichuan Depression[J]. Natural Gas Geoscience, 2015 , 26(6) : 1147 -1155 . DOI: 10.11764/j.issn.1672-1926.2015.06.1147

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