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Petrophysical Evaluation
Richard Woodhouse
May 13th2011
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Petrophysical Evaluation
Borehole logs and cores
Lithology & Mineralogy
Porosity
Permeability
Hydrocarbon Saturation
Oilfield Example
Correlation Example
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Oil-in-Place Calculation
Maps of Top Reservoir Oil-Water Contact depth
Net Sand thickness
Net thickness/Gross thickness Ratio (n/g)
Porosity
Hydrocarbon Saturation (Sh)
Oil Volume Calculation
= reservoir volume xn/g xporosity xSh Reserves
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Logs and Core Analysis
from South Morecambe gas field
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Core Sampling & Laboratory Analysis
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Permeability Estimation from Log Data
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Fluid Distribution in Pore Space[sand grains (brown), water
(blue), oil (yellow)]
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Water Retention versus Height
for constant radius grains
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Capillary Pressure Curves
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If n = 2 and
Rt / Ro = 10Sw = 0.32
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Resistivity Logs - Investigated Volumes
AT90
AT30
0.30m
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LLD LLS
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Oil Field Evaluation (Forties field) - Questions
4. What rock-type is at 2125m and at 2200-2205m?
5. See the large changes in the Deep Resistivity log.
What is the cause? What is the likely resistivity of the
water-bearing reservoir?
1. Identify each log-type in the Log Headings.
2. Over what sections is the natural Gamma-Ray (GR) readinglow,
and with bulk density (RHOB) and neutron (NPHI) curves
almost overlying each other?
3. What likely rock-type is the above, what is its porosity?
6. Assume that the water-bearing reservoirs resistivity (Ro) is
0.4
ohm.m (see 2275m), what is the water saturation at 2190m?
What is the fraction of hydrocarbon in the pore-space?
7. What is the depth of the Oil-Water Contact?
8. What approximate total reservoir thickness that can produce
oil?
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Induction Resistivity Tool: Basic Coil Arrays
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Deep Induction Vertical Response
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