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25 Cards in this Set
- Front
- Back
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Fraction of formation occupied by water
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phi * Sw
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Fraction of formation occupied by oil
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phi * So
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irreducible water, can't be removed from formation
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Swirr
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Residual oil, removed by special technique
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Sor
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Hydrocarbon resistivity
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high
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flushed zone, disturbed zone by drilling
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Rxo
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esistivity of brine
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Rwr
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resistivity of the filtrate of the drilling fluid
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Rmf
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Determination of fraction of shale
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V shale
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V shale is determined by
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gamma ray, and spontaneous potential (SP)
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Less negative SP measurement = ___ shale
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More shale content
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gamma ray ___ with higher shale content
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increases
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For a formation to contain hydrocarbons it must be
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porous
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pb will decrease with an increase in
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porosity
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neutron tool is sensitive to presence of
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hydrogen
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nuetron porisity, phi n, reflects the value of
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hydrogen content
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acoustic tool reports compressional wave slowness, delta t
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increases with porosity
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NMR, neutron magnetic resonance, depends on amount of hydrogen, therefore it increases with
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porosity
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If a poroous clean formation is ID'd then the ___ of the formation will be used to decide whether it is HC or brine
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Rt: Resistivity
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If it contains HCs the Rt will be
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high
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Distinguishing btwn oil and gas is done by comparing the __ to the ___
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density to Neutron porosity
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In order to obtain quanity of HC the product of __ and __ must be obtained
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porosity and Saturation of w
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If Rxo is the same as Rt then it is most likely that the ____ formation fluids are present in the __ __
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original , flushed zone
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If ratio of ___ to ___ is less than ratio of ___ to ___ then f
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Rxo Rt, Rmf Rw
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When HCs are present the transition may be significantly ___ than Rxo or Rt
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lower
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