Petroleum Geology Class 745 Heat Flow in Sedimentary Basins Petroleum Geology Class 745 Spring 2002 Istvan Csato University of South Carolina Department of Geological Sciences

Heat Flow in Various Tectonic Settings Welte et al. (1997)

Subsidence Rates of Basins Angevine et al. (1990)

rC(dT/dt) = d/dz [kz (dT/dz)] – vzrwCw (dT /dz) + A Heat Flow Equations Fourier’s law: q= kg q – heat fow k – thermal conductivity g – thermal gradient T= To + (q/k)Dz Heat transport equation: rC(dT/dt) = d/dz [kz (dT/dz)] – vzrwCw (dT /dz) + A r - bulk density C – bulk heat capacity rw – fluid density C – fluid heat capacity vz – fluid velocity A – radioactive heat generation per unit volume per unit time

Bottom-hole Temperature Deming (1997)

Thermal Conductivity Kpr = km(1-F)kwF k = 1.0 – 4.5 W/mK Ungerer et al. (1990) Deming and Chapman (1988) Kpr = km(1-F)kwF k = 1.0 – 4.5 W/mK m – matrix w – pore fluid

Sedimentation Rate and Heat Flow Deming (1997)

Heat Flow and Thrusting Wygrala et al. (1990)

Heat Flow and Salt Heynisch et al. (1987)

Heat Flow and Fluid Flow Willet and Chapman (1987)

Heat Flow and Fluid Flow Majorovitz et al. (1985)

Heat Flow Data Young (<25 Ma) rift basins: 90-120 mW/m2 Foreland basins: 50-70 mW/m2 Intracratonic basins: 30-50 mW/m2 Deming (1997)