Hydrocarbon Migration Istvan Csato University of South Carolina Department of Geological Sciences Petroleum Geology Class 745 Spring 2002.

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Presentation transcript:

Hydrocarbon Migration Istvan Csato University of South Carolina Department of Geological Sciences Petroleum Geology Class 745 Spring 2002

Hydrostatic condition: Buoyancy

Capillary Pressure Capillary pressure Condition of migration

Migration Critical height of oil stringer:

Migration

Darcy’s law: specific discharge [m/s] permeability of the matrix [m 2 ] viscosity of oil [kg/m/s] mean radius of the rock pores [m] tortuosity porosity oil saturation Migration

Vertical flow: q o =11.3 cm/year Updip flow at 2 o slope: q o =0.4 cm/year

Hydrodynamic Conditions

Hydrodynamic Traps

Compaction

Overpressure

Origin of Fluid Flow 1. Restricted-compaction 2. Meteoric Water Recharge

Mass conservation equation: Fluid flow equation (Darcy’s Law): Fluid Flow Compaction Fluid Flow - Compaction

Effective Stress - Porosity

Hydraulic fracturing

Primary and Secondary Migration as a function of rock permeability Primary Migration Secondary Migration

Migration and Accumulation

Migration from Shale to Sandstone

Migration through Fractures

Example

Origin of Fluid Flow 1. Restricted-compaction 2. Meteoric Water Recharge

Hydrodynamic Traps

Tilt of Oil-Water Contact