Experimental Evaluation of Permeability Damage to No.15 Coal Seam in the Qinshui Basin

Feng, Qihui; Kang, Yili; Fang, Huang

doi:10.1111/1755-6724.12306_10

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…(Ayers Jr, 2002; Beaton et al, 2006; Liu et al, 2022; Su et al, 2005; Yao et al, 2009). Among them, the gas content is a key parameter for CBM development because it ultimately determines the gas available to be recovered (Esen et al, 2020; Hou et al, 2020; Zhang et al, 2018). For the areas with multiple coal seams existing, the vertical distribution of gas contents of coal seams is also critical because it determines the exploration and exploitation strategy in the vertical.…”

Section: Introductionmentioning

confidence: 99%

Vertical coalbed gas content distribution in the Walloon Subgroup of Daandine gas field and its geological controls

Cui,

Huang,

Zhang

et al. 2023

Energy Exploration & Exploitation

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The Middle Jurassic Walloon Subgroup of Daandine gas field contains numerous coal seams with abundant coalbed methane (CBM) resources. However, the vertical gas content distribution of these coal seams is unclear currently, as well as its influencing factors, affecting the formulation of CBM exploration and exploitation strategy. For this purpose, using diverse geologic, experimental, and engineering data from recent exploration and development, this article ascertains the vertical coalbed gas content distribution in the Daandine gas field and discusses how the geological factors affect it. The results show that the coalbed gas contents have two basic trends as the depth increases: (1) increase, and then decrease; (2) increase. The former trend is dominant, and the inflection point occurs in the coal groups within or close to the Tangalooma Sandstone Formation. The correlation analysis shows that the macerals have little influence on the vertical coalbed gas content distribution. The moisture contents affect the adsorption capacity of coalbeds and show a negative correlation with the gas contents, and coal groups with higher moisture contents generally have lower gas contents. Three sets of independent gas-bearing systems exist in the Walloon Subgroup, and the coalbed gas content-depth relationship is relatively independent among different gas-bearing systems. The better the caprock condition, the higher the gas content, which is particularly evident in the coals of Condamine group. The permeabilities show a significant effect on the coalbed gas contents of Daandine coals. The coal groups within or close to the Tangalooma Sandstone Formation have higher permeabilities, as well as higher gas contents, and they are positively correlated. The reason is that the CBM in the study area is dominantly microbial in origin, and the higher permeability coals are conducive to the introduction of more microbial consortia into the coal seams, enhancing the generation of secondary biogenesis methane.

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Section: Introductionmentioning

confidence: 99%

Vertical coalbed gas content distribution in the Walloon Subgroup of Daandine gas field and its geological controls

Cui,

Huang,

Zhang

et al. 2023

Energy Exploration & Exploitation

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“…With the increasing demand for energy in the world, the research on unconventional oil and gas resources has been paid more and more attention globally, and their exploration and development process has also made great progress in the United States, , China, Canada, , and other places. , In China, unconventional oil and gas resources such as coalbed methane, shale gas, and tight gas have been studied and developed for decades, and breakthroughs have been made in the Qinshui Basin, − Ordos Basin, , Sichuan Basin, , and other places. − The Qinshui Basin is one of the important coal-accumulating basins in China. The coal seams in the basin are widely distributed with large thicknesses, and the coal reserves are abundant .…”

Section: Introductionmentioning

confidence: 99%

Characteristics and the Model of Thermal Evolution and Gas Generation of Late Paleozoic Coal in the Qinshui Basin, Based on Hydrous Pyrolysis

2021

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The Qinshui basin is an important coal-accumulating basin in China, and its Late Paleozoic coal is an important source rock of coalbed methane in the basin. Its thermal evolution and gas generation characteristics determined the grade of coalbed methane resources, especially the coal measure free gas resources in the basin. Late Paleozoic coal samples were collected for organic geochemical analysis, a high-volatile bituminous coal was used for hydrous pyrolysis, to propose the thermal evolution characteristics, gas generation characteristics, thermal evolution, and free gas accumulation model, and the Ordos Basin is compared. The results show that the variation trends of various geochemical parameters are different with the increase in R o . Hydrous pyrolysis shows that the gas production potential of coal is excellent. The gases produced consist mainly of CH 4 , C 2− , CO 2 , and H 2 . C 2− is produced only before the simulated temperature of 550 °C, and oil is produced only before the temperature of 500 °C. The thermal evolution stages can be divided into the immature stage, symbiosis stage, wet gas stage, and dry gas stage, and the symbiosis stage can be divided into the preliminary stage and mainly gas stage. R o , T max , (2+3)MP/(1+9)MP, saturated+arene, V daf , and H/C can be used as indicators of the thermal evolution stages. On the plane, the distribution of thermal evolution stages of the Shanxi Formation and the Taiyuan Formation is very alike. The gas generating strength of the Taiyuan Formation is higher than that of the Shanxi Formation. The gas generating strength in the north of the Taiyuan Formation is higher, while that in the south of the Shanxi Formation is higher. The second gas generation stage has a good spatio-temporal configuration relationship with accumulation factors, and the gas production is large, which is beneficial to the enrichment of the coal measure free gas resources. Relatively, the Ordos Basin has better prospects for exploration and development.

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“…However, in coal-bearing strata, the strong sealing ability of other lithologies due to clay filling, compaction and other factors cannot be ignored. Because of the sedimentary environment, the vertical Cyclic Characteristics of the Physical Properties of Key Strata in CBM Systems Controlled by Sequence Stratigraphy-An Example from the Gujiao Block permeability of unconventional gas reservoirs and other strata are generally low (Feng et al, 2015;Sander et al, 2016). An important factor in the formation of CBM systems is the development of an extremely low permeability caprock (Hao et al, 2000;Schmitt et al, 2013), such as limestone, mudstone, silty mudstone, etc.…”

mentioning

confidence: 99%

Cyclic Characteristics of the Physical Properties of Key Strata in CBM Systems Controlled by Sequence Stratigraphy—An Example from the Gujiao Block

Wang

Qin

Xie

et al. 2020

Acta Geologica Sinica (Eng)

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Multiple coal seams and interbedded rock assemblages formed in vertical progression due to the influence of multiple stages of sea level transgressions. Based on mercury injection experiment, low temperature liquid nitrogen experiment, porosity and permeability experiment and breakthrough pressure experiment, the vertical variation characteristics of coal-bearing strata in Gujiao block are explained in detail. The results of the mercury injection and low temperature liquid nitrogen experiments show that the pore structure characteristics fluctuate with increasing depth in the strata, with fewer micropores followed by transition pores. The BET specific surface area and average pore diameter of the Shanxi Formation are generally larger than those of the Taiyuan Formation. Due to the continuous cyclic sequence stratigraphy changes, the porosity, permeability, breakthrough pressure and breakthrough time of the samples show a certain cyclicity. Within the same sequence, the porosity is larger, and the permeability is smaller near the maximum flooding surface. Although the permeability of the sandstone samples is higher, the porosity is lower, and the breakthrough pressure and breakthrough times are greater. The strata in the study area formed in an oxidized environment that was affected by freshwater, and the pore structure of different lithologies is quite different. After the formation of sandstone, the intergranular pores generally underwent filling with secondary quartz, clay minerals and organic matter, resulting in low porosity and permeability.

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Experimental Evaluation of Permeability Damage to No.15 Coal Seam in the Qinshui Basin

Cited by 3 publications

References 6 publications

Vertical coalbed gas content distribution in the Walloon Subgroup of Daandine gas field and its geological controls

Vertical coalbed gas content distribution in the Walloon Subgroup of Daandine gas field and its geological controls

Characteristics and the Model of Thermal Evolution and Gas Generation of Late Paleozoic Coal in the Qinshui Basin, Based on Hydrous Pyrolysis

Cyclic Characteristics of the Physical Properties of Key Strata in CBM Systems Controlled by Sequence Stratigraphy—An Example from the Gujiao Block

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