In this paper, we present a laboratory study that investigates the behaviour of compositional displacements in multi-layered porous media. A quasi two-dimensional glass bead pack was used in the experiments. The porous medium had three uniform layers with each having a different permeability because of the different glass beads. An analog two-phase three-component liquid ternary system was used in the experiments at ambient conditions to mimic a condensing gas drainage displacement under reservoir conditions. We report a total of nine experiments which include three horizontal and six vertical cross-section displacements with different injection and initial fluids. The fluids chosen represent immiscible, near miscible and first-contact miscible systems. The effluents were collected for each experiment and their compositions were measured using gas chromatography. Several snapshots of the fluid distributions in the porous medium were taken during each experiment. The experimental results show that the horizontal displacements gave a better sweep efficiency. Most of the displacements took place in the high-permeability layer with the low-permeability layer not even touched, gravity effects were favourable in the vertical cross-section displacements where the high-permeability layer was at the bottom, and the gravity reduced the swept area in the flood with the flipped vertical cross-section model. The measured compositional data indicates differences in the compositional paths for different displacements.

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