Numerical simulation-based gravity flow slumping block sedimentation simulation method

Abstract

The invention discloses a numerical simulation-based gravity flow slumping block sedimentation simulation method. According to the method, calculation is performed through a Navier-Stocks equation anda momentum theorem to obtain a slope of a sand-mud layer during slumping and a speed and viscosity of sand during sliding; at the moment, a slumping block only has gravitational potential energy; inthe slumping process, original gravitational potential energy is reduced, so that the gravitational potential energy is converted into kinetic energy and internal energy; and melange is carried and sedimentated through a k-epsilon model under water to finally form the slumping block. The gravitational potential energy of sediments is gradually reduced to 0; the underwater flow speed is reduced, namely, the kinetic energy is reduced, and buoyancy force exists; and the gravitational potential energy and the kinetic energy are finally converted into the internal energy. According to the method, asimulative space is controllable; the cost is low; the consumed time is short; few man-made interference factors exist in the simulative process; different sedimentation environments can be simulatedand analyzed, and a quantitative parameter-based mathematical model can be built; the requirements of an actual geological process can be better met; and the demands of geological workers are met.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploration, in particular to a method for simulating the deposition of gravity flow slump bodies based on numerical simulation. Background technique [0002] Gravity flow is a high-density fluid dispersed with a large amount of sediment that flows under the action of gravity, and is a non-Newtonian fluid that does not obey the law of internal friction. The discovery of slump deformation not only has sedimentological significance, but also provides an important sedimentological basis for restoring the tectonic background of each research area, and it is a new field of exploration for subtle oil and gas reservoirs. [0003] At present, the research on the sedimentation mechanism of gravity flow landslides mainly adopts the tank experiment, that is, the mud is directly poured into the tank with a slope to simulate the deposition process. However, the biggest disadvantage of the above-ment...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for simulating the sedimentation of gravity flow landslides based on numerical simulation, so as to overcome the complex operation of the prior art, the limited size of experimental equipment, and the different sediment deformations that can be observed.

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