Origin of natural gas in Ordovician in the west of Jingbian Gasfield, Ordos Basin

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  • 1.Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company, Xi’an 710018, China;
    2.National Engineering Laboratory for Exploration and Development of Low-permeabilityOil and Gas Fields, Xi’an 710018, China

Received date: 2015-04-17

  Revised date: 2015-06-23

  Online published: 2016-01-10

Abstract

With the break-through of natural gas exploration of the middle array of Ordovician Majiagou Formation in the west of Jingbian Gasfield,the determination of the origin of natural gases becomes a key issue of the gas exploration direction.Based on the analysis of the geochemical characteristics of natural gas,deepening the understanding of distinguishing the origin of high-over mature gas,the paper investigated the primary source of the natural gas of Ordovician in the west of Jingbian Gasfield by the correlation of gas-gas and gas-source and the analysis of the spacial combination of source-reservoir-cap rocks.The results show that the Ordovician natural gas in the west of Jingbian Gasfield mainly belongs to coal-formed gas and there is some oil-type gas which is characterized by self-generation and self-preservation in local areas.According to the research,the genetic discrimination of highly matured dry gas should take the methane carbon isotope as a main basis.In addition,a kind of new interpretation about the phenomenon that the δ13C2 is apparently low and even lower than δ13C1 has been put forward in this paper.

Cite this article

Kong Qing-fenZhang Wen-zheng,Li Jian-feng,Zan Chuan-li . Origin of natural gas in Ordovician in the west of Jingbian Gasfield, Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(1) : 71 -80 . DOI: 10.11764/j.issn.1672-1926.2016.01.0071

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