Abstract
The salinity, chemical properties, and migration characteristics of groundwater in coal measures are the key factors that affect the generation, migration, and reservoir of hydrogen sulfide (H2S) in low-rank coal seams. Taking the Jurassic coal and rock strata in the southeastern margin of the Junggar basin as the research object, according to the hydrogeological characteristics of the coal measures, the region is divided into 4 hydrogeological units. The coalbed methane contains a large number of secondary biogas. Along the direction of groundwater runoff, the salinity and the pH value increase gradually. The salinity in the hydrogeological units is low; it is not conducive to the propagation of sulfate-reducing bacteria and the formation of hydrogen sulfide of the Houxia, the south of Manasi River, and Hutubi and Liuhuangou area, the western region of the Miquan. The high salinity center and depressions of low water level (hydrodynamic stagnation zone) in the hydrogeological unit of the Liuhuanggou and the Miquan are the main areas for the production and enrichment of H2S in the low-rank coal. The high salinity in water is formed by infiltration, runoff, and drought evaporation. At the same time, the deep confined water environment closed well; in conditions of hydrocarbon-rich, under the action of sulfate-reducing bacteria, bacterial sulfate reduction will occur and hydrogen sulfide formed. According to the circulation characteristics of water bearing H2S in the region, imbricate and single bevel two kind generation and enrichment mode of hydrogen sulfide under the action of hydrodynamic control. The solubility of hydrogen sulfide in pure water and solutions of NaCl and Na2SO4 with different molar concentrations was calculated. The H2S solubility of groundwater in coal measures of 4 hydrogeological units was estimated.
Highlights
The Xinjiang Uygur Autonomous region is a domestic coalproducing province with predicted reserves accounting for about 40% in China
It is generally believed that H2S can be formed by biochemical degradation in the early peat accumulation, the bacterial sulfate reduction (BSR) in the peat accumulation period and at the stage of coal formation, thermochemical sulfate reduction (TSR) during coal evolution, and thermal decomposition sulfides (TDS) and magma activity, and it is widely believed that the BSR and TSR are the main origins of H2S in coal and rock seams [1,2,3,4,5]
Based on the anomalous enrichment of coal and rock strata in the southeastern margin of Junggar basin, this paper analyzes the geological overview of the study area and discusses the effects of salinity of groundwater in coal measures on the formation, migration, and accumulation of H2S in low-rank coal seams
Summary
The Xinjiang Uygur Autonomous region is a domestic coalproducing province with predicted reserves accounting for about 40% in China. The southeastern margin of Junggar basin is a typical development basin of coalbed methane of inland low-rank coal. Hydrogen sulfide (H2S) in coalbearing strata in many mining areas is abnormally enriched, serious in the southeastern margin of Junggar basin, such as Urumqi, Changji, and Fukang, and there are many accidents involving death and injury [1]. Based on the anomalous enrichment of coal and rock strata in the southeastern margin of Junggar basin, this paper analyzes the geological overview of the study area and discusses the effects of salinity of groundwater in coal measures on the formation, migration, and accumulation of H2S in low-rank coal seams. It provides theoretical support for atmospheric environmental pollution control It provides reference for the exploration and development of low-rank coal seam coalbed methane containing H2S in the southeastern margin of Junggar basin, China
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