In-situ Stress Distribution and Its Influence on Coalbed Methane Development in Tielieke Mining Area, Kubai Coalfield, Xinjiang

doi:10.19657/j.geoscience.1000-8527.2022.021

Abstract

Abstract:

In-situ stress, coal reservoir permeability and coal reservoir pressure are the important factors on coalbed methane development.Based on the analysis of injection/fall-off well analysis and in-situ stress measurement data, and combined with the analysis of daily gas production of coalbed methane wells in the Tielieke mining area (Kubai coalfield, Xinjiang), we study the characteristics of in-situ stress distribution at Tielieke and its influence on CBM development.The results show that: (1) the in-situ stress state changes vertically, with σ_H>σ_v>σ_h, σ_H≈σ_v>σ_h and σ_v>σ_H>σ_h at 550-650 m, 650-850 m and 850-1,200 m reservoir depth, respectively; (2) 850 m depth is not only the conversion point of the vertical principal stress and the maximum horizontal principal stress, but also the transition point of permeability trend. This demonstrates the in-situ stress the control on permeability; (3) the in-situ stress correlates negatively with permeability, but positively with coal reservoir pressure; (4) for the in-situ stress, its negative effect of on productivity is greater than its positive effect on productivity, and hence the typical daily gas production decrease with increasing in-situ stress; (5) the central coal reservoirs in Tiexi and Tiedong mining areas have relatively developed granular coal, large adsorption pore volume and gas content, which are favorable intervals for CBM development.Our results provide theoretical guidance for further CBM development in the Kubai coalfield.

Key words: coalbed methane, in-situ stress, coal reservoir permeability, coal reservoir pressure, gas content, Tielieke mining area

CLC Number:

P618.11
P553

WEI Yongheng, GE Yanyan, WANG Gang, WANG Wenfeng, TIAN Jijun, LI Xin, WU Bin, ZHANG Xiao. In-situ Stress Distribution and Its Influence on Coalbed Methane Development in Tielieke Mining Area, Kubai Coalfield, Xinjiang[J]. Geoscience, 2022, 36(05): 1324-1332.

Figures/Tables 12

Fig.1 Location map of the Kubai coalfield (a) and tectonic outline map of the Tielieke mining area (b)

Table 1 Parameters of injection/fall-off well test and in-situ stress measurement test in the Tielieke mining area

参数	范围(均值)
埋深h/m	563.38~1 157.61(813.18)
破裂压力P_f/MPa	8.44~24.65(15.32)
破裂压力梯度G_f/(MPa·hm^-1)	0.46~2.54(1.85)
闭合压力P_c/MPa	8.14~22.30(14.15)
闭合压力梯度G_c/(MPa·hm^-1)	0.98~2.47(1.76)
储层压力P_o/MPa	4.62~11.39(7.57)
储层压力梯度G_o/(MPa·hm^-1)	0.78~1.07(0.93)
渗透率k/mD	0.008~3.930(0.630)
温度T/℃	17.90~33.56(27.01)
最大水平主应力σ_H/MPa	9.33~33.52(20.22)
最大水平主应力梯度 G_H/(MPa·hm^-1)	1.37~3.91(2.53)
最小水平主应力σ_h/MPa	8.05~22.30(14.48)
最小水平主应力梯度 G_h/(MPa·hm^-1)	1.19~2.43(1.80)
垂向主应力σ_v/MPa	15.21~31.26(21.99)

Fig.2 Relationship between maximum horizontal principal stress gradient (GH), minimum horizontal principal stress gradient (Gh), reservoir pressure gradient(Go)and burial depth in the Tielieke mining area

Fig.3 Relationship between the maximum horizontal principal stress (σH), minimum horizontal principal stress (σh), reservoir pressure (Po), vertical principal stress (σv) and hydrostatic pressure (Ph) and the burial depth of the reservoirs in the study area

Fig.4 Relationship between λ and burial depth (h) in the Tielieke mining area

Fig.5 Relationship between maximum horizontal principal stress and permeability (a), minimum horizontal principal stress and permeability (b), and vertical principal stress and permeability (c) in the Tielieke mining area

Fig.6 Relationship between maximum horizontal principal stress-reservoir pressure and permeability (a), minimum horizontal principal stress-reservoir pressure and permeability (b), and vertical principal stress-reservoir pressure and permeability (c) in the Tielieke mining area

Fig.7 Relationship between coal reservoir permeability and burial depth in Tielieke mining area

Fig.8 Relationship between minimum horizontal principal stress and reservoir pressure in the Tielieke mining area

Fig.9 Feature differences of coal reservoirs with different burial depths in the west Tielieke area

Fig.10 Feature differences of coal reservoirs with different burial depths in the east Tielieke area

Fig.11 Relationship between minimum horizontal principal stress and typical daily gas production of the Tielieke mining area in the Kubai coalfield

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