NDLI: Natural gas leakage of Mizhi gas reservoir in Ordos Basin, recorded by natural gas fluid inclusion

Content Provider	Springer Nature Link
Author	Li, RongXi Di, LingJun Xi, ShengLi
Copyright Year	2007
Abstract	Abundant natural gas inclusions were found in calcite veins filled in fractures of Central Fault Belt across the centre of Ordos Basin. Time of the calcite veins and characteristics of natural gas fluid inclusion were investigated by means of dating of thermolum luminescence (TL) and analyzing stable isotope of fluid inclusion. Results show that natural gas inclusion formed at 130–140°C with salinity of 5.5 wt%–6.0 wt% NaCl. It indicates that natural gas inclusion is a kind of thermal hydrocarbon fluid formed within the basin. Method of opening inclusion by heating was used to analyze composition of fluid inclusion online, of which the maximal hydrocarbon gas content of fluid inclusion contained in veins is 2.4219 m$^{3}$/t rock and the maximal C$_{1}$/ΣC$_{ i }$ ratio is 91%. Laser Raman spectroscopy (LRS) was used to analyze chemistry of individual fluid inclusion in which the maximal hydrocarbon gas content is 91.6% compared with little inorganic composition. Isotope analysis results of calcite veins show that they were deposited in fresh water, in which the δ $^{13}$C$_{PDB}$ of calcite veins is from −5.75‰ to 15.23‰ and δ $^{18}$O$_{SMOW}$ of calcite veins is from 21.33‰ to 21.67‰. Isotope results show that δ $^{13}$C$_{1 PDB}$ of natural gas fluid inclusion is from −21.36‰ to −29.06‰ and δD$_{SMOW}$ of that is from −70.89‰ to −111.03‰. It indicates that the gas of fluid inclusion formed from coal source rocks and it is the same as that of natural gas of Mizhi gas reservoir. Results of TL dating show that time of calcite vein is (32.4±3.42)×10$^{4}$ a, which is thought to be formation time of gas inclusion. It indicated that natural gas inclusion contained in calcite veins recorded natural gas leakage from Mizhi gas reservoir through the Central Fault Belt due to Himalayan tectonic movement.
Starting Page	124
Ending Page	132
Page Count	9
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	50
Issue Number	2
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	natural gas inclusion leakage of natural gas natural gas reservoir formation Ordos Basin Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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