Re-examination of genetic types and origins of natural gases from Dibei Uplift,eastern  Luliang Uplift,Junggar Basin

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Exploration Department,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;
    3.Department of Production Operation,Xinjiang Oilfield Company,Petrochina,Karamay 834000,China;
    4.Urumchi Branch,Eastern Geophysical Company,PetroChina,Urumchi 830000,China;
    5.Research Institute of Petroleum Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay  834000,China

Received date: 2019-02-15

  Revised date: 2019-03-19

  Online published: 2019-08-05

Abstract

The eastern part of Luliang Uplift has currently become the main target for gas exploration in the Junggar Basin.By now,several giant-medium gas fields (reservoirs)are discovered in the Dinan Uplift.Located north to the Dinan Uplift,the Dibei Uplift is surrounded by several hydrocarbon generating sags and developed several sets of source rocks,which promises a favorable gas accumulation condition.Based on molecular and stable carbon isotopic compositions of 9 gas samples from Dibei Uplift,in cooperation with the burial and hydrocarbon generation history of source rocks,genetic types and origins of natural gases and related secondary alterations were fully discussed in this study.A comparative study was also carried out with the geochemical characteristics of natural gases from Dinan Uplift.Gases from Dibei Uplift have complicated origins which could primarily be divided into three types:(1)Highly-mature coal-derived gas generated from the Upper Carboniferous Bashan coal measures;(2)Highly-mature oil-type gas generated from the marine source rocks in the Lower Carboniferous Jiangbasitao Formation or Songkaersu Formation);(3)Secondary microbial methane generated via the biodegradation of oils.Significant differences have been observed between gases from Dibei and Dinan Uplifts in the concentration of non-hydrocarbon gases,carbon isotopes and thermal maturities.Gases from the Dibei Uplift are at highly mature stage,which correlates well with the maturities of Carboniferous source rocks in the Wulungu Depression.Thus,these gases are most probably derived from the Wulungu Depression.

Cite this article

Wei Yan-Zhao, Song Zhi-Hua, Qi Rui, Wang Wei, Gong De-Yu, Wang Feng . Re-examination of genetic types and origins of natural gases from Dibei Uplift,eastern  Luliang Uplift,Junggar Basin[J]. Natural Gas Geoscience, 2019 , 30(6) : 840 -849 . DOI: 10.11764/j.issn.1672-1926.2019.03.012

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