Permeability estimation from sonic-transit-time versus porosity gradients
Conference
·
OSTI ID:471961
High permeability sands can be distinguished from low permeability sands by examining slopes on sonic-transit-time versus porosity cross plots. Sonic-transit-time is plotted against porosity from neutron-density nuclear logs or simply density logs. A best fit line is drawn through the scatter of data, the slope of this best fit line is used in the process of permeability estimation. The slope is steepest in relatively low permeability sands, while a shallow slope is observed in more permeable sands. This variability in slope can be understood in terms of grain size distributions, pore fluids, bulk modulus of the fluids and that of the grains, clay content affecting changes in porosity, permeability, and sonic-transit-time. A physical model, which is a qualitative sand-shale model, and a mathematical model, which is a quantitative model, based on the Biot-Stoll theory, are used to substantiate the above mentioned technique.
- OSTI ID:
- 471961
- Report Number(s):
- CONF-961003--
- Country of Publication:
- United States
- Language:
- English
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