The mechanism of the flowing ground water impacting on coalbed gas content

Qin, Shanshan; Yan, Song; Tang, Xiuyi; Guo-you, FU

doi:10.1007/bf03184093

Cited by 11 publications

(3 citation statements)

References 2 publications

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“…Previous studies have shown that the meteoric and surface water might flow into the deeper strata of the Shanxi Formation, influenced by the Liulin Nose Structure (Li et al, 2014). Since 13 CH 4 is much more easily transported away by water, the strong hydrodynamic conditions could cause the carbon isotopes of coalbed methane to become lighter (Li et al, 2014;Qin et al, 2005Qin et al, , 2006. Thus, the light carbon isotopes of methane and high N 2 content measured in this study might also be related to past complex tectonic movements that created strong hydrodynamic conditions.…”

Section: Origin Of Hydrocarbon Gasesmentioning

confidence: 99%

Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China

Sun

Wang

Wei

et al. 2017

Energy Exploration & Exploitation

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The Lower Permian Shanxi Formation marine-continental transitional organic-rich shale is one of the most important potential shale gas plays in the Ordos Basin, China. However, the content and origin of desorbed gas from the Shanxi Formation are poorly documented, limiting the understanding of gas generation and potential play elements. Geochemical characteristics of desorbed gas, including content and origin, are analyzed from 17 core samples of the Shanxi Formation from well SL-1. The results show that the Shanxi Formation shales in the study area are characterized by high total organic carbon content of 1.17-2.63%, type III organic matter, and high T max between 493 and 513 C. The desorbed gas content of the shale samples varies from 0.22 to 0.50 m 3 /t, with an average of 0.37 m 3 /t, and shows a positive correlation with total organic carbon. The gases are dominated by methane (69.57-89.02%), with small amounts of ethane (0.01-0.09%). The carbon isotopic signature d 13 C 1 ranges from À49.5 to À45.3%, and the d 13 C 2 ranges from À23.3 to À14.7%. In addition, gases released from the Shanxi Formation core samples are thermogenic in origin and possibly coal derived, as the Whiticar chart and the diagram of ethane versus d 13 C 2 suggest.

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Section: Origin Of Hydrocarbon Gasesmentioning

confidence: 99%

Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China

Sun

Wang

Wei

et al. 2017

Energy Exploration & Exploitation

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“…[8], and therefore, some the researchers always put them together to compare, such as the differences in cause of formation, evolutionary stage and thermal evolution temperature ate different during the natural gas generation [9]; specific to the state of occurrence, the content of adsorbed gas in the coalbed methane is lower; the shale gas has little effect by structural conditions, while the coalbed methane is different. In China's Ordos Basin and Qinshui Basin, you can also see the coalbed methane and shale gas symbiosis [10]. gas exploration and development.…”

Section: Formation Conditions Of the Shale Gasmentioning

confidence: 99%

Conditions of Shale Gas Accumulation and Exploration Practices in China

Huo

Duan

2014

AMR

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Because the United States has achieved significant success on shale gas exploration and development, which makes a number of countries in North America, Europe to begin to make a series of exploration work [1]. China also launched China's first shale gas resource exploration project in Qijiang County, Chongqing in October 2009. According to the Shale Gas “Twelfth Five-year” Development Plan, the shale gas production will reach 60 - 100 billion cubic meters in 2020. This paper will make a brief review on shale gas formation conditions and the exploration and development projects already have been undertaken, hoping to provide some supports for the development of China's unconventional energy.

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“…15 coal seam exhibits significant thickness, high adsorption capacity, moderate gas content, low critical desorption pressure, and substantial gas production potential (Jiang et al, 2022). At present, the commercial development of CBM from high-rank coal reservoirs in Qinshui Basin has achieved remarkable results (Nie et al, 2000;Qin et al, 2005;Chen et al, 2015;Wang et al, 2024b).…”

Section: Introductionmentioning

confidence: 99%

Production characteristics and influencing factors of coalbed methane wells: a case study of the high-ranking coal seam in the southeastern Qinshui Basin, China

Chen,

Gao,

Wang

2024

Front. Earth Sci.

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This study focuses on coalbed methane (CBM) wells in high-ranking coal seam as the research subject. Considering the influence of effective stress and matrix shrinkage, a comprehensive permeability calculation model for CBM reservoirs is established. Based on this model, the variations in pressure and permeability during well production are quantified. By integrating static geological parameters, a finely classified classification of CBM wells is achieved using self-organizing map (SOM) neural network. Subsequently, an analysis of production dynamic characteristics and productivity differences among different types of CBM wells is performed, followed by providing drainage optimization suggestions. The results of SOM analysis show that 7,000 m3/d and 1,500 m3/d can be used as the production boundaries for the wells with different productivity in Block P. The daily gas production of exceptional well exceeds 7,000 m3/d, and the permeability remains relatively stable throughout the drainage process of this well. The daily gas production of the potential well ranges from 1,500 to 7,000 m3/d, and the permeability exhibits a significant decrease during the drainage process. The daily gas production of Inefficient well is consistently below 1,500 m3/d with moderate permeability variation. In addition to well location and structural geology, production variability is also influenced by the matching of reservoir conditions and drainage systems. This is primarily manifested in discontinuous drainage systems and rapid decline in bottom hole pressure (BHP) during early production. The analysis of drainage parameters indicates that in order to achieve optimal production from CBM wells, the BHP should exhibit an initial rapid decline followed by a slowly decrease during the early production period, with an average pressure drop ranging from 0.005 to 0.02 MPa/d. The research findings can offer technical guidance for the future advancement of CBM in the P Block.

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The mechanism of the flowing ground water impacting on coalbed gas content

Cited by 11 publications

References 2 publications

Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China

Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China

Conditions of Shale Gas Accumulation and Exploration Practices in China

Production characteristics and influencing factors of coalbed methane wells: a case study of the high-ranking coal seam in the southeastern Qinshui Basin, China

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