Characteristics and sedimentary control of a coalbed methane-bearing system in lopingian (late permian) coal-bearing strata of western Guizhou Province

Shen, Yue; Qin, Yong; Guo, Yinghai; Yi, Tongsheng; Yuan, Xuexu; Shao, Yang

doi:10.1016/j.jngse.2016.04.047

Cited by 58 publications

(28 citation statements)

References 19 publications

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“…The analysis result of the V/(V+Ni) study is not perfectly in agreement with that of V/Cr, Sr/Ba, etc., which may be influenced by the content and maturity of TOC (Abanda and Hannigan, 2006; Tribovillard et al., 2006). Morever, high siderite content of these shales (Table 5) represented weak oxidation–weak reduction condition of lagoon and tidal flat (Shen et al., 2016) is the direct evidence of the closed and reductive sedimentary environment with normal seawater. However, these proxies do not reflect the alternate change of oxic and anoxic environment in the vertical direction of 958.30–883.60 m, indicating that a relatively deep water of lagoon and tidal flat environment.…”

Section: Discussionmentioning

confidence: 94%

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Sang

Yang

et al. 2018

Energy Exploration & Exploitation

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Indentifying reservoir characteristics of coals and their associated shales is very important in understanding the co-exploration and co-production potential of unconventional gases in Guizhou, China. Accordingly, comprehensive experimental results of 12 core samples from well LC-1# in the northern Guizhou were used and analyzed in this paper to better understand their vertical reservoir study. Coal and coal measured shale, in Longtan Formation, are rich in organic matter, with postmature stage of approximately 3.5% and shales of type III kerogen with dry gas generation. All-scale pore size analysis indicates that the pore size distribution of coal and shale pores is mainly less than 20 nm and 100 nm, respectively. Pore volume and area of coal samples influenced total gas content as well as desorbed gas and lost gas content. Obvious relationships were observed between residual gas and BET specific surface area and BJH total pore volume (determined by nitrogen adsorption). For shale, it is especially clear that the desorbed gas content is negatively correlated with BET specific surface area, BJH total pore volume and clay minerals. However, the relationships between desorbed gas and TOC (total

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Section: Discussionmentioning

confidence: 94%

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Sang

Yang

et al. 2018

Energy Exploration & Exploitation

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“…In recent years, coalbed methane (CBM) development has received special attention in areas with multiple coal seams . Several unconventional gas resources located in coal deposits have been studied as systems . At present, gas predrainage along coal seam boreholes is mainly used in China, which is also an effective method for coal seam gas recovery and gas disaster prevention and control in coal mines, as shown in Figure .…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16] Several unconventional gas resources located in coal deposits have been studied as systems. [17][18][19] At present, gas predrainage along coal seam boreholes is mainly used in China, which is also an effective method for coal seam gas recovery and gas disaster prevention and control in coal mines, [20][21][22] as shown in Figure 2. The effective extraction radius of borehole is an important parameter for this method, which is used for the determination of borehole spacing in gas extraction.…”

mentioning

confidence: 99%

Theoretical, numerical, and experimental analysis of effective extraction radius of coalbed methane boreholes by a gas seepage model based on defined criteria

Wang

Chang

et al. 2019

Energy Science & Engineering

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The effective extraction radius of borehole is the main parameter for determining the design and layout for coalbed methane extraction. This paper is aimed at the problem that the criteria and calculation methods for the effective extraction radius of coal seams are not comprehensive. With Wudong Coal Mine in China taken as an example, the critical gas pressure (0.441 MPa) for the calculation of effective extraction radius is first defined. Next, the gas seepage unit model around the borehole is developed, and the theoretical mathematical expression to calculate the effective extraction radius is derived. Then, the numerical simulation of gas extraction is carried out through a computational fluid dynamics program, and the effective extraction radius is obtained numerically. Furthermore, the influence of original gas pressure, borehole diameter, and negative pressure of gas extraction on gas extraction is analyzed. Finally, the results from the theoretical calculation and numerical simulation are validated by the field engineering measurement and the average relative error is small (less than 10%). The results indicate that the effective extraction radius has a linear relationship with the extraction time. Moreover, it is found that the original gas pressure is the main factor affecting the effective extraction radius and the effective extraction radius is proportional to the borehole diameter and negative pressure through analysis. Therefore, the above findings can provide a theoretical basis for determining parameters such as borehole spacing and extraction time of gas extraction in coal mines.

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“…CBM resources are abundant in western Guizhou and eastern Yunnan, South China, and the area has become a hot spot for CBM exploration and development in recent years (Li et al., 2015; Shen et al., 2016). Different from other CBM-producing areas (Qinshui Basin), multilayer joint mining is the main development model in this region.…”

Section: Introductionmentioning

confidence: 99%

Structural and fractal characterization of adsorption pores of middle–high rank coal reservoirs in western Yunnan and eastern Guizhou: An experimental study of coals from the Panguan syncline and Laochang anticline

Zhang

Wei

Gao

et al. 2018

Energy Exploration & Exploitation

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To better understand the structural characteristic of adsorption pores (pore diameter < 100 nm) of coal reservoirs around the coalbed methane production areas of western Yunnan and eastern Guizhou, we analyzed the structural and fractal characteristics of pore size range of 0.40-2.0 nm and 2-100 nm in middle-high rank coals (R o,max ¼ 0.93-3.20%) by combining low-temperature N 2 /CO 2 adsorption tests and surface/volume fractal theory. The results show that the coal reservoirs can be divided into three categories: type A (R o,max < 2.15%), type B (2.15% < R o,max <2.50%), and type C (R o,max > 2.15%). The structural parameters of pores in the range from 2 to 100 nm are influenced by the degree of coal metamorphism and the compositional parameters (e.g., ash and volatile matter). The dominant diameters of the specific surface areas are 10-50 nm, 2-50 nm, and 2-10 nm, respectively. The pores in the range from <2 nm provide the largest proportion of total specific surface area (97.22%-99.96%) of the coal reservoir, and

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Characteristics and sedimentary control of a coalbed methane-bearing system in lopingian (late permian) coal-bearing strata of western Guizhou Province

Cited by 58 publications

References 19 publications

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Theoretical, numerical, and experimental analysis of effective extraction radius of coalbed methane boreholes by a gas seepage model based on defined criteria

Structural and fractal characterization of adsorption pores of middle–high rank coal reservoirs in western Yunnan and eastern Guizhou: An experimental study of coals from the Panguan syncline and Laochang anticline

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