Research on the Pore Structure Characteristics and Gas Storage Properties of Coal Reservoirs in Western Guizhou:A Case Study of Well D1 in Daijiatian Coal Mine
Microscopic pores in coal reservoirs are the primary space for hydrocarbon gas occurrence,thus the structural characteristics of these pores significantly influence gas storage capacity.Understanding these pores and the gas storage properties of coal reservoirs is of great crucial for determining coalbed methane extraction in-tervals and gas control protection layers.The Western Guizhou region is rich in coal and coalbed methane re-sources,however,there is limited research on the pore structure characteristics and gas storage properties of its coal reservoirs.This paper uses coal samples from the Permian Longtan Formation,located in Well D1 of the Daijiatian Mine in the Zhina Coalfield,as a case study.The pore structure characteristics of coal reservoirs in the research area were analyzed using field emission scanning electron microscopy,high-pressure mercury method,low temperature N2 adsorption,and high-temperature isothermal adsorption methods.Moreover,the influence of pore structure characteristics on gas storage was discussed.The results indicate that the Longtan Formation coal reservoirs contain a diverse range of micropores,including well-developed micropores,small pores,medium pores,and large pores.The types,forms,and origins of these pores vary among different coals.The specific surface area of micropores is positively correlated with the maximum adsorption volume and on-site desorption volume of CH4,which plays a key role in the adsorption capacity of CH4.This study identified that 14 coal and 27 coal areas have strong gas storage potential and large resource potential,making them suitable as high-quality layers for surface mining of coalbed methane.
Western GuizhouLongtan Formationcoalbed methanepore structuregas storage
万方数据
维普
