Comparison of gas sources in Xiaohelong area of Dehui Depression, Songliao Basin

  • Zhongcheng LI , 1, 2 ,
  • Zhidong BAO 1 ,
  • Zhaosheng WEI 2 ,
  • Guoyi ZHANG 2 ,
  • Junjie LIU 3 ,
  • Bo LIU , 3
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  • 1. College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China
  • 2. Research Institute of Exploration and Development,Jilin Oilfield Company,PetroChina,Songyuan 138000,China
  • 3. Institute of Unconventional Oil & Gas,Northeast Petroleum University,Daqing 163000,China

Received date: 2021-10-12

  Revised date: 2021-12-15

  Online published: 2022-06-28

Supported by

The National Science and Technology Major Project(2016ZX05047005)

the Prospective Foundation Project of the China National Petroleum Corporation(2021DJ0205)

Highlights

To further understand the genetic types and gas sources of newfound natural gas in Xiaohelong area of Dehui Depression, Songliao Basin, the source rock evaluation of Yingcheng, Shahezi and Huoshiling formations, as well as the genetic and gas source analysis of Denglouku and Quantou formations are carried out by using source rock organic carbon, pyrolysis data, natural gas composition and carbon isotope data. The results show that the source rocks in Xiaohelong area are medium-good source rocks with TOC content of 0.42%-58.11%, mainly of types II2 and III kerogen, which are in mature-high mature stage. The natural gas in Denglouku-Quantou formations is organic coal gas, and some samples have the characteristics of mixed gas. The equivalent maturity of natural gas is 0.97%, which is similar to the type and maturity of source rocks in Yingcheng Formation. Different from the gas bearing horizons that mainly contributed by the source rocks of Huoshiling and Shahezi formations in previous exploration, the source rocks of Yingcheng Formation are the main source of natural gas of Denglouku and Quantou formations in Xiaohelong area, which are a set of newly discovered exploration strata.

Cite this article

Zhongcheng LI , Zhidong BAO , Zhaosheng WEI , Guoyi ZHANG , Junjie LIU , Bo LIU . Comparison of gas sources in Xiaohelong area of Dehui Depression, Songliao Basin[J]. Natural Gas Geoscience, 2022 , 33(6) : 992 -1000 . DOI: 10.11764/j.issn.1672-1926.2021.12.006

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