New evidence for the origin of natural gas in Ordos Basin from hydrocarbons of oil water |
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Authors: | Dujie Hou Xianqing Li Youjun Tang |
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Institution: | (1) Jianghan Petroleum University, 434102 Jingzhou, China |
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Abstract: | The chief aim of the present work is to investigate the controversy origin of natural gas in the Ordos Basin by using the
hydrocarbons of oil water. New evidence has been found: There is relatively high content of light hydrocarbons and low content
of heavy components in the hydrocarbons fraction of oil water in the middle gas field of the Majiagou Formation, Ordovician
reservoir. The hydrocarbons of oil water in Well Shan 12 and Well Shan 78 have relatively high abundance of tricyclic terpane.
Tricyclic terpane/hopane of the two samples are 1.48 and 0.36, respectively. They also show that pregnane and hompregnane
are in relatively high abundance with lower hopane/sterane ratio. Pr/Ph is less than 2.0. These characteristics reflected
the source input of marine carbonate sedimentary environment. In contrast, the hydrocarbon of Well Shan 81 is lack of tricyclic
terpane series and pregnane. It has a high hopane/sterane ratio and Pr/Ph is 3.27. These parameters are typical character
of terrestrial organic matter. Furthermore, the hydrocarbons of oil water in Well Shan 37 and Well Shan 34 is between the
two typical situations. They have little content of tricyclic terpanes. They may be derived from a mixing source of marine
carbonate and terrestrial organic matter input. Similarly, the maturity parameters approve this suggestion. The samples of
Well Shan 12 and Well Shan 78 which derived from marine carbonate have relatively high maturity and samples derived from terrestrial
organic matter have lower maturity. The maturity of the hydrocarbons of mixing source is between these two situations. The
suggestion coincides with the geological background and source rocks distribution. |
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Keywords: | oil water hydrocarbons of oil water origin of natural gas Ordos Basin |
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