| Abstrakt: |
The development and research of shale gas is already a hot topic in unconventional natural gas research. This paper takes the late Paleozoic shale formation of the sea-land transitional facies as the research object. Starting from the study of the pore microstructure, the porosity and characteristics of the shale reservoir Carry out research on unconventional natural gas accumulation factors, focusing on the microscopic pore and fracture system of methane in shale reservoirs and their mutual migration characteristics. The following results have been achieved: joints and fractures in different lithological reservoirs in the study area are relatively developed, forming a more complex fracture network system. Under the microscope, the reservoirs are generally denser, with well-developed fissures, larger length-to-width ratios, and smaller openings. The correlation between the porosity of the lithological reservoirs in the study area is poor. As a whole, the correlation between the porosity and permeability of different lithological reservoirs in the study area is poor, but there is a weak positive linear correlation overall. Dark mudstone reservoirs are easier to adsorb in low pressure areas. In high pressure areas, the adsorption capacity of coal reservoirs increases at a slower rate as the pressure increases. In the process of production and development of this type of reservoir, the gas production under the unit pressure drop in the early stage will be lower. Only after the pressure is reduced to a certain level, the gas production will increase rapidly. [ABSTRACT FROM AUTHOR] |
