Tectonic Stress is Not the Main Driving Force for Primary Migration of Oil and Gas

doi:10.11885/j.issn.1674-5086.2019.06.10.02

Abstract

Abstract: The primary migration of oil and gas is an unsolved academic problem. In the field of petroleum geology, structural stress is considered to be one of the main driving forces for the primary migration of oil and gas. According to the theory of effective stress and elastic mechanics, the influence of structural stress on pore pressure is analyzed. The calculation model of pore pressure increment and the calculation model of oil-gas migration scale driven by pore pressure release are established. Theoretical analysis and quantitative calculation results show that under the same structural stress condition, the increment of pore pressure of source rock is mainly affected by Young's modulus. The larger the Young's modulus is, the smaller the increment of pore pressure is; the increment of pore pressure caused by structural stress is generally not more than 60 MPa; the release of pore pressure only needs to discharge a small amount of formation fluid, and the distance to drive oil and gas migration is very short, relatively because the thickness of source rock is negligible, and the influence of structural stress on the primary migration of oil and gas is very weak, which can not be the main driving force of the primary migration.

Key words: tectonic stress, primary migration, dynamics, pore pressure, source rocks

CLC Number:

TE311
TE112

LUO Chuan, YANG Hu. Tectonic Stress is Not the Main Driving Force for Primary Migration of Oil and Gas[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 104-110.

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