Fig. 4.
A numerical model shows a layered overburden caprock and reservoir with pressures, thicknesses, and a central injection point.The image shows a two-dimensional numerical model domain with three horizontal layers. The top layer is labelled overburden with a thickness of 0.05 metres and a uniform applied top pressure labelled p top equal to 0.1 megapascals. Below this is a caprock layer with a thickness of 0.15 metres, bounded laterally by caprock pressure labelled p cap sub i. The bottom layer is a reservoir with a thickness of 0.35 metres and lateral reservoir pressure labelled p res sub i. A vertical injection well passes through the overburden and caprock into the reservoir, ending at an injection point. The base of the model shows a vertical stress labelled sigma v equal to 18 megapascals. The total model width is 1.00 metres. The right boundary is labelled no flow. The domain is discretised with a triangular mesh pattern across all layers.

2D plain strain model – mesh and boundary conditions during (a) compaction: caprock, pcap,comp = 0·1 MPa reservoir, pres,comp = 0·1 MPa; and (b) water saturation: caprock, pcap,sat = 1 MPa, reservoir pres,sat = 3 MPa

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