Saturday, September 26, 2026

GeophysicsGeologyTech InsightsDigital

A unified workflow for hydrocarbon migration simulation: Embedding trap and seal assessment in seismic interpretation

September 24, 2026
Revised on: September 25, 2026

Charge and migration remain the most uncertain components of petroleum system analysis because they depend on subsurface processes that cannot be observed directly and are only weakly constrained by available geological and geophysical data. We present a trap and seal assessment workflow that is embedded in the seismic interpretation and direct hydrocarbon indicator (DHI) environment. Migration therefore runs on the very same structural and stratigraphic model that was interpreted, rather than on a filtered surrogate, and modelled traps and observed DHIs are tested against each other systematically. The workflow operates in two complementary modes: a map-based mode that simulates fill, spill and leak on interpreted surfaces, and a three-dimensional mode that resolves migration within the carrier volume itself. Its physical fidelity is adapted to the available data, from a buoyancy-only algorithm in data-poor settings to macroscopic invasion percolation where a dense capillary entry pressure model can be built. In the three-dimensional mode, a relative geological time (RGT) model plays two roles: it partitions the domain into layers that carry petrophysical properties and migration physics, independently of how those properties are stored, and it resolves updip and downdip directions and quantifies dip without extracting explicit horizons or a geocellular grid. Because the RGT model is the end product of the interpretation, using it as the primary input closes a rapid loop between interpretation and migration and preserves the stratigraphic control on migration pathways that is lost when properties are simply painted into regular grids such as seismic volumes. We illustrate the workflow with map-based and three-dimensional examples on North West Shelf and New Zealand datasets, including a direct-hydrocarbon-indicator study on the Goodwyn field and a dry-well post-mortem on Poseidon.