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Petroleum Geology (Introduction to Reservoir Properties) Final Examination
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21 Terms
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reservoir rock
a place that oil migrates to and is held underground.
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* Sandstones
* Limestone and /or Carbonate rocks
Examples of reservoir rocks includes:
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Coring
processes used to recover formation samples from petroleum reservoirs.
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the capacity and ability of the reservoir rock to store and conduct petroleum fluids through the matrix
Physical sample of reservoir rock core is essential to evaluate the two most significant characteristics:
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1. Framework
2. Matrix
3. Cement
4. Pores
Four major components of sandstone
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3 to 7
90
Core diameters are typically from _ to *_* inches and are usually about ___ feet long
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Sidewall Sampling Gun/Tool
can be used to obtain small plugs from the formation.
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Sidewall Sampling Gun/Tool
The tool is run on a wireline after the hole has been drilled.
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Sidewall cores
useful for identifying hydrocarbons zones, when viewed under UV light.
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Whole Core
Provides larger samples
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Whole Core
Better and more consistent representation of formation
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Whole Core
Better for heterogeneous rocks or for more complex lithologies
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Plugs or Sidewall Cores
Smaller samples
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Plugs or Sidewall Cores
Less representative of heterogeneous formations
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Plugs or Sidewall Cores
Within 1 to 2% of whole cores for medium-to highporosity formation
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Plugs or Sidewall Cores
In low-porosity formations, Φ from core plugs tends to be much greater than Φ from whole cores
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Plugs or Sidewall Cores
Scalar effects in fractured reservoirs
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* Porosity
* Horizontal permeability to air
* Grain density
INFORMATION FROM CORES
Standard Analysis
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* Vertical permeability to air
* Relative permeability
* Capillary pressure
* Cementation exponent (m) and saturation exponent (n)
INFORMATION FROM CORES
Special Core Analysis