Abstract
Deep reservoir burial, diverse reservoir media and complex gas–water relationship are the typical characteristics of ultradeep carbonate gas reservoirs. The burial depth of more than 4500 m makes the temperature and pressure conditions of this type of gas reservoir far higher than that of conventional gas reservoirs. The pore structure and fluids properties of the reservoir will change greatly under ultra-high temperature and pressure, thereby affecting the percolation characteristics of single-phase and multiphase fluids under reservoir conditions. In addition, the coexistence pattern of pores, fractures and cavities makes the ultradeep carbonate gas reservoirs could be divided into pore type, cavity type and fracture-cavity type. The flow types in porous media include percolation in microscopic pores and macroscopic fractures, and free flow in cavities. Multi-type reservoir characteristics and heterogeneity make the percolation mechanism of ultradeep carbonate gas reservoirs more complicated. The traditional percolation theory of hydrocarbon reservoirs cannot accurately describe the percolation characteristics of this type of gas reservoir . It is necessary to deeply study the percolation mechanism considering the ultra-high temperature and pressure conditions, diverse pore structure characteristics and complex water content conditions of ultradeep carbonate gas reservoirs.
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Wang, L. (2023). Special Percolation Mechanism of the Ultradeep Carbonate Gas Reservoir. In: Ultradeep Carbonate Gas Reservoirs. Springer, Singapore. https://doi.org/10.1007/978-981-19-9708-2_2
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DOI: https://doi.org/10.1007/978-981-19-9708-2_2
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