Origin and source of natural gas from Wuxia Fault Belt in the northern Mahu Sag,Junggar Basin

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  • 1.The State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum (Beijing), Beijing 102249,China;2.Experimental Testing Institute,Xinjiang Oilfield Company,Karamay 834000,China;
    3.Exploration & Development Institute,Xinjiang Oil Field Company,Karamay 834000,China

Received date: 2015-05-25

  Revised date: 2015-07-28

  Online published: 2019-09-20

Abstract

There is higher exploration degree and complicated natural gas composition in Wuxia Fault Belt and the west slope region of Mahu Sag in the Junngar Basin at present.Based on the analyses of characteristics of occurrence,and organic geochemistry of natural gases and source rocks,the authors systematically investigated the origin and source of natural gases.The natural gas which has been discovered substantially belongs to dissolved gas in crude oil,while a minor amount of gas-layer gas mainly distributes in the Mesozoic of Wuxia Fault Belt,belonging to shallow gas-layer gas resulted from ex-solution of gas which was previously dissolved in crude oil.Natural gas was dominated by alkane gas with a relatively low amount of carbon dioxide,nitrogen and other non-hydrocarbon compounds.The gas dryness coefficient ranges between 0.66 and 0.99,and mainly belongs to wet gas,while minor dry gas distributes in shallower part as a consequence of stronger migration differentiation.The natural gas is mainly of sapropelic and mixed origin which is approaching to sapropelic.Gas of humic origin is rarely found.The analytical results of gas-source indicate that the gas is mainly derived from Fengcheng Formation lacustrine source rock with sapropelic-mixed precursors.The contribution of the Wu'erhe Formation source rock with humic precursors is small,and the Jiamuhe Formation source rock with humic precursors has contribution to local gas accumulation in the slope region with developed faults.

Cite this article

Gao Gang, Xiang Bao-li, Ren Jiang-ling, Zhang Wei-wei, Ma Wan-yun, He Wen-jun . Origin and source of natural gas from Wuxia Fault Belt in the northern Mahu Sag,Junggar Basin[J]. Natural Gas Geoscience, 2016 , 27(4) : 672 -680 . DOI: 10.11764/j.issn.1672-1926.2016.04.0672

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