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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (1): 110-121.doi: 10.11764/j.issn.1672-1926.2019.06.008

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Development potential of Carboniferous-Permian coal measures shales gas in Qinshui coalfield

Qiu ZHONG1(),Xue-hai FU1(),Miao ZHANG1,Qing-hui ZHANG2,Wei-ping CHENG3   

  1. 1.Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China School of Resources and Geoscience, China University of Mining and Technology, Xuzhou 221116, China
    2.China Shanxi Provincial Coal Geological Exploration and Research Institute, Taiyuan 030001, China
    3.Shanxi Provincial Research Institute of Geology and Mineral Resources, Taiyuan 030001, China
  • Received:2019-05-22 Revised:2019-06-28 Online:2020-01-10 Published:2020-01-09
  • Contact: Xue-hai FU E-mail:764669679@qq.com;fuxuehai@163.com
  • Supported by:
    Double First Class Construction Independent Innovation Project, China University of Mining and Technology(2018ZZCX05)

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Abstract:

The organic geochemistry and mineral composition characteristics of shale in coal measures are analyzed through the experiments of total organic carbon content (TOC), rock pyrolysis, maturity of organic matter and rock X-ray diffraction of 695 shale core samples collected from 27 wells in Qinshui coalfield. The results show that the average TOC value of marine-terrigenous facies shale in coal measures is more than 2.0%, and the middle-good source rocks are mainly concentrated in the second interval. The shale is mainly composed of Type III kerogen, and its thermal evolution is mainly at the over-mature stage with high conversion rate. The shale in Qinshui coalfield is mainly clayey shale. Its mineral composition is characterized by high clay and low silica minerals, and kaolinite is enriched in clay minerals. The rock brittleness index based on mineral composition is mainly distributed between 30% and 50%, with an average of more than 40%, and the brittleness index is II>III>IV>I (The first interval is K8-3# coal, the second interval is 3# coal-K4 limestone, the third interval is K4 limestone-15# coal, and the fourth interval is 15# coal- the Fe-Al-Bearing Rock Members). The ratio of abnormal layer, gas-bearing layer and gas layer thickness is 4.78%, 33.38% and 61.83%, respectively. Gas layer is dominant, and the gas measurement shows the level is II>III>IV>I. Based on the comprehensive analysis of the thickness, organic matter abundance, brittleness and gas-bearing characteristics of shale gas in coal measures, the favorable sequence of the exploration and development potential of shale gas in each interval is II>III>IV>I.

Key words: Shale gas, Shale in coal measures, Organic geochemistry, Mineral composition, Marine-terrigenous facies, Qinshui coalfield

CLC Number: 

  • TE132.2

Fig. 1

Tectonic outline map, comprehensive histogram of coal measure,distribution of wells in the Qinshui coalfield (modified from Refs. [9-10])"

Fig.2

TOC distribution of coal measure shales in each member"

Fig.3

Thickness distribution of TOC over 2% of coal measure shales in each member"

Fig.4

The potential of generating hydrocarbon Pg（S0+S1+S2） of coal measure shales"

Fig.5

The plot of TOC vs. Pg"

Table 1

The rock pyrolysis parameters of coal measure shales from different formations"

参数第Ⅰ层段第Ⅱ层段第Ⅲ层段第Ⅳ层段
TOC/%范围0.17~17.250.14~23.320.12~46.360.22~35
均值2.682.822.953.69
Tmax/℃范围318.8~578.3347.5~589.2317.5~568.8456.42~590.8
均值517.98509.8487.93525.1
S2/(mg/g)范围0.008 9~2.130.006~5.840．010 5~1.250.025 6~0.83
均值0.520.530.430.37
生油潜量(P)/(mg/g)范围0.015 1~2.180.020 8~5.930.018 3~1.290.034 0~0.85
均值0.530.540.450.40
生烃潜量(Pg)/(mg/g)范围0.121 4~2.180.166 5~5.930.018 3~1.290.035 6~0.85
均值0.530.540.450.43
有效碳(PC)/%范围0.001 4~0.180 90.001 8~0.491 80.001 5~0.106 90.003 0~0.070 9
均值0.044 10.045 10.037 30.033 0
氢指数(IH)/(mg/g)范围0.89~165.080.84~362.120.77~134.035.43~81.34
均值48.3452.0745.2742.55
降解潜率(D)/%范围0.14~16.300.25~43.910.11~13.030.63~7.77
均值4.844.854.193.94

Fig.6

The plot of Tmax and IH"

Fig.7

The plot of D and IH"

Fig.8

The RO distribution of coal measure shales"

Fig.9

The relationship between RO and buried depth"

Fig.10

Ternary diagram for mineral composition of coal measure shales （modified from Ref.[26])"

Fig. 11

Frequency distribution histogram of brittleness index （BI）"

Fig.12

Average thickness histogram of gas logging shows"

Fig.13

Gas bearing level ratios of gas logging shows"

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