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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (11): 1515-1523.doi: 10.11764/j.issn.1672-1926.2020.04.018

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Source of Carboniferous natural gas in Kelameili area， Junggar Basin

Er-ting LI1,2(),Jun JIN1,2,Jian WANG1,2,Zheng-jiang LUO1,2,Wan-yun MA1,2,Ju-lei MI1,2,Dan HE1,2,Ming WANG1,2   

  1. 1.Xinjiang Laboratory of Petroleum Reserve in Conglomerate，Karamay 834000，China
    2.Research Institute of Experiment and Testing，Xinjiang Oilfield Company，PetroChina，Karamay 834000，China
  • Received:2020-02-13 Revised:2020-04-15 Online:2020-11-10 Published:2020-11-24

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Abstract:

Based on analysis of geochemical characteristics of two sets of Carboniferous source rocks， and combined with the composition of natural gas and the carbon isotopic composition distribution of n-alkanes in condensate oil， the source of Carboniferous natural gas in Kalameili area of Junggar Basin is discussed. Carboniferous natural gases in Kelameili area are mainly wet gas. Among them， natural gas in Kalameili Gas Field is highly mature humic gas， and natural gas in Wucaiwan Gas Field is mature to highly mature humic gas. Based on evaluation of hydrocarbon generation potential of source rock and thermal simulation experiment， source rocks of the lower Songkaersu Formation and the Dishuiquan Formation in the study area are mainly type III kerogen， with a small amount of type II kerogen， and its maturity reaches mature to high mature stage with good potential of gas generation. At 600 ℃， the total gas production rate of source rocks is greater than 150 kg/tTOC. During the stage of high pyrolysis temperature （from 440 ℃ to 560 ℃）， the carbon isotope values of natural gas generated by two sets of Carboniferous source rocks are consistent with natural gas in Kelameili area. And the carbon isotopic composition distribution of n-alkanes shows that the condensate oil associated with the Carboniferous gas reservoirs in Kelameili area is mainly from source rocks of the lower Songkaersu Formation and the Dishuiquan Formation.

Key words: Junggar Basin, Kelameili area, Carboniferous, Natural gas, Carbon isotope of normal alkaneFoundation item：The Key Laboratory Open Project of Xinjiang Uygur Autonomous Region, China （Grant No. 2017D04023）.

CLC Number: 

  • TE122.1

Fig.1

Structural position and well distribution of Kelameili area in Junggar Basin"

Fig.2

Geochemical characteristics of natural gas in Kelameili area"

Fig.3

Organic carbon and S1 + S2 value of Carboniferous source rocks in Kelameili area"

Fig.4

Correlation of hydrogen index and Tmax of Carboniferous source rocks in Kelameili area"

Table 1

Characteristics of gas from thermal simulation of Carboniferous source rocks in Kelameili area"

层位样品编号组分不同温度下碳同位素值/‰
320 ℃360 ℃400 ℃440 ℃480 ℃520 ℃560 ℃600 ℃
C1sbDX8井甲烷-30.89-37.7-38.8-34.9-30.4-29.4-28.8-26.6
乙烷/-29.6-26.9-23.2-14.0-12.6//
丙烷/-26.2-23.5-20.3////
C1/C1-50.850.750.760.880.980.980.990.99
C28井甲烷-35.74-38.8-39.1-35.2-32.6-30.4-28.7-27.6
乙烷/-30.6-26.9-21.5-20.9///
丙烷/-29.5-24.8-18.2-22.6///
C1/C1-5/0.780.810.900.910.980.990.99
C1dD15井甲烷-31.65-38.3-39.5-36.3-30.8-29.1-27.7-27.2
乙烷/-29.8-27.5-24.6-16.0///
丙烷/-26.6-24.6-21.8////
C1/C1-50.810.870.910.950.980.990.990.99

Fig.5

Carbon isotopegas from thermal simulation of Carboniferous source rocks in Kelameili area"

Fig.6

Thermal simulation gas production of Carboniferous source rocks in Kelameili area"

Fig.7

Carbon isotope distribution of n-alkanes in Carboniferous source rocks from Kelameili area"

Fig.8

Carbon isotope distribution of condensate oil in Carboniferous from Kelameili area"

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