2-D modeling of gas and overpressure generation in the Venture field (Canada)

Conference · Tue May 01 04:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:7089866

Forbes, P L; Ungerer, P ^[1]; Mudford, S ^[2]

---

1. Institut Francais du Petrole, Rueil Malmaison (France)
2. Greenstone Geophysical Research Halifax, Nova Scotia (Canada)

Venture field is located in an overpressured zone of gas accumulations in a region that had low sedimentation rates over the last 80 m.y. This could support the hydrocarbon generation, rather than compaction disequilibrium, as the main cause for overpressuring. Study of these accumulations can be done using the IFP (Institut Francais du Petrole) THEMIS model, which integrates compactions, hydraulic fracturation, fluid flows, heat transfer, and formation and migration of hydrocarbons. A single phase basin scale model is constructed first to assess the input parameters related to the fluid-flow reconstruction. The permeability of faults is calibrated to fit the actual pressure distribution through the field. Permeability is found to be very low and allows a fit to the regional distribution of overpressuring. In a second step, a two-phase model, restricted to the field itself, is used to test parameters related to hydrocarbon and source rocks. Gas accumulations are effectively obtained in the reservoir units. Finally, the two-phase model is extended to the regional scale to check the parameters previously assessed. At this scale, the gas and overpressure distributions are found to fit those actually observed. Gas accumulations contribute slightly to overpressuring, which is better accounted for by compaction disequilibrium despite the low sedimentation rates. Generation in or close to the reservoir unit does not contribute significantly to the gas accumulations. However, gas sources are found in the underlying formations.

• OSTI ID: 7089866
• Report Number(s): CONF-900605--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 74:5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
CANADA
COMMINUTION
ENERGY TRANSFER
FLUID FLOW
FRACTURING
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
HEAT TRANSFER
HYDRAULIC FRACTURING
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NORTH AMERICA
NOVA SCOTIA
PERMEABILITY
POROSITY
RESERVOIR PRESSURE
RESERVOIR ROCK
RESOURCES