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Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (1): 119-124.doi: 10.11764/j.issn.1672-1926.2020.09.010

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Carbon isotope characteristics of methane during desorption of coalbed methane

Dan WANG1(),Guang-shan GUO2,Yang YU3,Gai-xia ZHANG4,Ming CHEN4,Ming-xing CHEN   

  1. 1.Baise University，Baise 533000，China
    2.New Energy Research Center，CNOOC Research Institute，Beijing 100028，China
    3.China Institute of Geo?Environment Monitoring，Beijing 100081，China
    4.PetroChina CBM Company Linfen Branch，Linfen 042300，China
  • Received:2020-07-06 Revised:2020-09-24 Online:2021-01-10 Published:2021-02-04
  • Supported by:
    The Guangxi Zhuang Autonomous Region Universities Young and Middle-aged Teachers' Basic Scientific Research Ability Improvement Project(2020KY19021)

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Abstract:

The research is performed with core samples obtained by ropes， which was desorbed continuously within seal container， and carbon isotopic analyses were measured for the CBM samples collected per 250 mL one time. The result of test indicates： In earlier stage，δ13CPDB CBM increases slowly； δ13CPDB CBM increases quickly when the amount of desorption gas up to certain volume； In last stage， δ13CPDB CBM became to increase slowly again. In the condition of constant temperature in the earth surface， δ13CPDB of CBM desorption gas becomes heavy with increasing time， and it is characterized by a mode of slow， fast then slow. In common， the result for isotope testing of CBM desorption samples， it is slightly lower for the earlier desorption stage than the true isotope.

Key words: CBM, Resolve, Carbon isotope, Fractionation

CLC Number: 

  • TE132.2

Table1

Gas component concentration table of CBM sample"

样品无空气体积分数 / %
N2CO2CH4C2H6C3H8
M6-22.561.1296.210.11/

Table 2

Relationship between methane carbon isotope ratio and desorption time & volume for the coal sample"

序号时间间隔/min时间/min体积/mL体积累加/mL温度/℃同位素值/‰
166（装罐）1 341.5（损失气量）1 341.525-
2392501 591.525-36.1
34132501 841.525-35.8
45182502 091.525-35.7
57252502 341.525-35.4
611362502 591.525-35.6
712482402 831.525-35.4
814622553 086.525-35.2
920822153 301.525-35.2
10501322403 541.525-34.9
11301623003 841.535-34.5
12251872504 091.535-34.0
13402272524 343.535-33.7
14552822754 618.535-33.3
15753572504 868.535-32.7
161134702525 120.535-32.6
171626322525 372.535-32.0
182578892505 622.535-30.9
194471 3362255 847.535-27.7
201 3532 6892406 087.535-22.5
212 0804 7691056 192.535-
残余1 378.27 570.735

Fig.1

Volume of desorbed CBM versus the square root of desorption time"

Fig.2

Curve chart of desorbed rate in the process of CBM desorption"

Fig.3

Curves illustrating how CBM methane δ13CPDB values vary with desorption time"

Fig.4

Change in methane δ13CPDB with the volume of desorbed gas"

Fig.5

Change in methane δ13CPDB with the volume fraction of the desorbed gas"

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