Preliminary Study on the Mechanism of Abnormal High Pressure Formed by Oil and Gas Accumulation

doi:10.11885/j.issn.1674-5086.2019.04.17.01

Abstract

Abstract: The formation mechanism of abnormal high pressure is very complex, and it is an unsolved academic problem, which needs to be further studied. By analyzing the characteristics of oil and gas migration, accumulation and reservoir drainage, the mechanism of abnormal high pressure formed by oil and gas accumulation is preliminarily explored from the aspects of "filling" power of oil and gas, quantitative calculation of abnormal high pressure, preservation and release of abnormal high pressure. The results show that the main driving force of oil and gas migration into reservoir is capillary pressure at the junction of reservoir and reservoir. The smaller the radius of pore capillary, the greater the power of oil and gas "filling" from reservoir to reservoir. The radius of pore capillary is one of the important factors affecting the maximum formation pressure coefficient in reservoir. The abnormal high pressure can be formed if the oil and gas volume of reservoir is slightly larger than the water discharged from reservoir; the abnormal high pressure in reservoir can be preserved by capillary pressure plugging; there is no capillary pressure at the reservoir-cap junction outside the oil and gas accumulation area, and the reservoir can release pressure through the drainage of caprock. The theory of abnormal high pressure formed by hydrocarbon accumulation can reasonably explain the fact that the pressure of most reservoirs is higher than that of hydrostatic column at the same depth, and that the formation pressure coefficient is slightly greater than 1.0, but high abnormal high pressure reservoirs is very few; it can also reasonably explain the cause of formation of high abnormal high pressure.

Key words: oil and gas accumulation, abnormal high pressure, formation pressure, reservoir, mechanism

CLC Number:

TE122.2⁺3

HU Liming. Preliminary Study on the Mechanism of Abnormal High Pressure Formed by Oil and Gas Accumulation[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 118-124.

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