STUDY ON GEOCHEMICAL CHARACTERISTICS OF FLUIDS ANDRESERVOIR CONNECTIVITY OF XUJIAHE FORMATIONIN QIONGXI GAS FIELD, SICHUAN BASIN
Received date: 2007-08-15
Revised date: 2007-09-25
Online published: 2008-06-20
Natural gases of the T3x2 reservoir in Qiongxi structure have the same or similar geochemical characteristics because of the same source, but due to different time of gas accumulation, some subtle geochemical differences in the hydrocarbon fingerprint characteristics can still be detected. Based on the comprehensive analysis of gas composition, C3-C8 light hydrocarbon fingerprint, carbon isotope monomer composition and biomarkers of reservoir extract, this paper identifies the fluid geochemical characteristics of different wells and examines the reservoir connectivity. The results show that the T3x2 reservoir consists of four poor-connectivity blocks, including uplift tectonic West Wing (Qiongxi 5 well), horst fault block in the North, fault block in the South and Qiongxi 12 well. The North horst fault block and the fault block in the South have better internal connectivity. They are poorly connected to the uplift tectonic West Wing and the Qiongxi 12 well.
Key words： reservoir; Fluid; Geochemical characteristics; Connectivity; Qiongxi structure.
WANG Shun-yu;MING Qiao;HUANG Ling;ZHONG Jia-guo;YANG Yang . STUDY ON GEOCHEMICAL CHARACTERISTICS OF FLUIDS ANDRESERVOIR CONNECTIVITY OF XUJIAHE FORMATIONIN QIONGXI GAS FIELD, SICHUAN BASIN[J]. Natural Gas Geoscience, 2007 , 18(6) : 789 -792 . DOI: 10.11764/j.issn.1672-1926.2007.06.789
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