MNEMONICS FOR CPH CURVE and PARAMETER NAMES Alith = calculated neutron density lithology factor (fractional) ALITH1 = neutron density lithology factor for 1st mineral (fractional) ALITH2 = neutron density lithology factor for 2nd mineral (fractional) ALITH3 = neutron density lithology factor for 3rd mineral (fractional) API = oil gravity (API units) AREA = area of reservoir (acres)
Bg = gas formation volume factor (fractional) BHT = bottom hole temperature (degrees F or degrees C) BHTDEP = depth at which BHT was measured (ft or m) Bo = oil formation volume factor BVW = bulk volume of free water (fractional) BVWm = bulk volume of moveable water (fractional) BVI = bulk volume of irreducible water (fractional) BVWir = bulk volume of irreducible water (fractional) BVH = bulk volume of hydrocarbon (fractional) BVHm = bulk volume of moveable hydrocarbon (fractional) BVHr = bulk volume of residual hydrocarbon (fractional) BVWsh = bulk volume of water bound to 100 % shale (fractional)
C = intermediate term in Simandoux equation CAL = caliper log reading, borehole diameter (mm or inches) CBW = clay bound water (fractional) Ccl = water salinity (ppm Cl) CPERM = permeability constant (fractional)
D = intermediate term in Simandoux equation DTC = sonic log reading (usec/ft or usec/m) DTCc = sonic log reading corrected for shale (usec/ft or usec/m) DTCMA = sonic log reading in 100% matrix rock (usec/ft or usec/m) DTCSH = sonic log reading in 100% shale (usec/ft or usec/m) DTCW = sonic log reading in 100% water (usec/ft or usec/m) DTC1 = sonic log reading in 1st mineral (usec/ft or usec/m) DTC2 = sonic log reading in 2nd mineral (usec/ft or usec/m) DTC3 = sonic log reading in 3rd mineral (usec/ft or usec/m) DENS = density log reading (gm/cc or kg/m3) DENSc = density log reading corrected for shale (gm/cc or kg/m3) DENShy = calculated hydrocarbon density (gm/cc or kg/m3) DENSMA = density log reading in 100% matrix rock (gm/cc or kg/m3) DENSma = calculated matrix density (gm/cc or kg/m3) DENSSH = density log reading in 100% shale (gm/cc or kg/m3) DENSW = density log reading in 100% water (gm/cc or kg/m3) DENS1 = density log reading in 1st mineral (gm/cc or kg/m3) DENS2 = density log reading in 2nd mineral (gm/cc or kg/m3) DENS3 = density log reading in 3rd mineral (gm/cc or kg/m3) DEPTH = formation depth (ft or m) DPERM = porosity exponent for permeability calculation (fractional) DTC = compressional travel time (usec/ft or usec/m) DTMA_C = matrix rock compressional travel time (usec/ft or usec/m) DTMA_S = m atrix rock shear travel time (usec/ft or usec/m) DTS = shear travel time (usec/ft or usec/m)
E = intermediate term in Simandoux equation EPERM = irreducible saturation exponent (fractional)
F = formation factor (unitless) FFI = free fluid index (fractional) FT = formation temperature (degrees Fahrenheit or Celsius) FT1 = formation temperature (degrees Fahrenheit)
GOR = gas oil ratio (cf/bbl or m3/m3) GPERM = constant in Coates permeability equation GR = gamma ray log reading (API units) GR0 = gamma ray log reading in 100% clean zone (API units) GR100 = gamma ray log reading in 100% shale (API units) GRAD = temperature gradient (degrees F/ft or degrees C/m)
HPV = HydH = hydrocarbon volume per unit area (ft or m) HPERM = constant in permeability equation I = formation resistivity index (unitless) JPERM = exponent in permeability equation
KBUCKL = Buckles number, porosity times water saturation product (fractional) KCP = sonic log compaction factor (fractional) KD = gas correction factor for density porosity (fractional) Kh = flow capacity or permeabilitythickness product (mdft or mdm) Klith = calculated sonic density lithology factor (fractional) KLITH1 = sonic density lithology factor for 1st mineral (fractional) KLITH2 = sonic density lithology factor for 2nd mineral (fractional) KLITH3 = sonic density lithology factor for 3rd mineral (fractional) KN = gas correction factor for neutron porosity (fractional) KPERM = permeability constant (fractional) KS = gas correction factor for sonic porosity (fractional) KSP = temperature factor for SP calculation (degrees F) Krg = relative permeability to gas (fractional) Kro = relative permeability to oil (fractional) Krw = relative permeability to water (fractional) KRwg = water to gas permeability ratio (fractional) KRwo = water to oil permeability ratio (fractional)
Lh = any log reading in 100% hydrocarbon Li = any log reading in 100% of the ith component of matrix rock LOG = any log reading Lsh = any log reading in 100% shale Lw = any log reading in 100% water
M = cementation exponent (fractional) Min1,2,3 = relative volume of mineral 1, mineral 2, mineral 3, etc (fractional) Mlith = calculated sonic density lithology factor (fractional) MLITH1 = sonic density lithology factor for 1st mineral (fractional) MLITH2 = sonic density lithology factor for 2nd mineral (fractional) MLITH3 = sonic density lithology factor for 3rd mineral (fractional)
N = saturation exponent (fractional) NetH = net pay thickness (ft or m) Nlith = calculated neutron density lithology factor (fractional) NLITH1 = neutron density lithology factor for 1st mineral (fractional) NLITH2 = neutron density lithology factor for 2nd mineral (fractional) NLITH3 = neutron density lithology factor for 3rd mineral (fractional)
PE = effective photoelectric cross section (barns/cm3) Perm = calculated permeability (millidarcies) Permd = calculated permeability from Dumanoir method (md) Permp = calculated permeability from porosity method (md) Permw = calculated permeability from Wyllie method (md) PEsh = photoelectric log reading in 100% shale (barns/electron) PE1 = photoelectric log reading in 100% of 1st matrix component (barns/electron) PE2 = photoelectric log reading in 100% of 2nd matrix component (barns/electron) PF = formation pressure (psi or KPa) PHIavg = average porosity (fractional) PHIbvw = effective porosity from BVW method (fractional) PHID = density log reading (fractional) PHIdc = porosity from density log corrected for shale (fractional) PHIDDC = density dry clay point (fractional) PHIDm = density log reading corrected for matrix offset (fractional) PHIDSH = density log reading in 100% shale (fractional) PHIe = effective porosity (fractional) PHIept = total porosity from electromagnetic log (fractional) PhiH = pore volume per unit area (ft or m) PHIMAX = maximum expected porosity in clean rock (fractional) PHImx = effective porosity from PHIMAX method (fractional) PHIN = neutron porosity log reading (fractional) PHInc = neutron porosity corrected for shale (fractional) PHINDC = neutron log dry clay point (fractional) PHINm = neutron log reading corrected for matrix offset (fractional) PHINMA = neutron log reading in 100% matrix rock (fractional) PHInml = nuclear magnetic log reading (fractional) PHINSH = neutron log reading in 100% shale (fractional) PHINW = neutron log reading in 100% water (fractional) PHIrt = porosity calculated from deep resistivity log (fractional) PHIs = total porosity from sonic log (fractional) PHIsc = porosity from sonic log corrected for shale (fractional) PHIsec = secondary (vuggy) porosity from sonic log (fractional) PHISSH = sonic porosity of 100% shale (fractional) PHIt = total porosity from any log (fractional) PHItrue = true porosity from core analysis or density neutron crossplot (fractional) PHIuse = useful porosity (fractional) PHIwtr = total porosity in a water zone, used to find RW@FT from R0 (fractional) PHIx = intermediate result in density neutron porosity calculation PHIxdn = porosity from density neutron crossplot (fractional) PS = standard surface pressure (psi or KPa) Pv = Pore Volume (ft or m)
Qo = calculated oil productivity (bbl/day)
R0 = resistivity of rock filled with water (ohmm) RESD = deep resistivity log reading (ohmm) R0 = resistivity of rock filled with water (ohmm) RESD = deep resistivity log reading (ohmm) RESM = medium resistivity reading (ohmm) RESS = shallow resistivity log reading (ohmm) RF = recover factor (fractional) Rgas = recoverable reserves of gas (mcf or m3) RMFE = equivalent mud filtrate resistivity (ohmm) RMF@FT = mud filtrate resistivity (ohmm) RMF@TRMF = mud filtrate resistivity at measured temperature (ohmm) Ro = computed resistivity of rock filled with water (ohmm) Roil = recoverable reserves of oil (bbl or m3) RSH = resistivity of shale (ohmm) RSP = RWE / RMFE in SP calculation (fractional) RW@FT = water resistivity at formation temperatures (ohmm) RW@TRW = water resistivity at measured temperature (ohmm) RWa = apparent water resistivity (ohmm) RWai = apparent water resistivity of ith layer (ohmm) RWSH = water resistivity of water bound to shale (ohmm)
Smo = moved oil water saturation from any method (fractional) SP = spontaneous potential log reading in zone of interest (mv) SP0 = spontaneous potential log reading in 100% clean zone (mv) SP100 = spontaneous potential log reading in 100% shale (mv) Sro = residual oil water saturation from any method (fractional) SUFT = surface temperature (degrees Fahrenheit or Celsius) Sw = calculated water saturation from any method (fractional) SWa = water saturation from Archie method (fractional) SWavg = average water saturation (fractional) SWd = water saturation from Dual Water method (fractional) Swpt = invaded zone saturation from EPT method (fractional) SWir = irreducible water saturation (fractional) SWp = water saturation from porosity saturation product (fractional) SWs = water saturation from Simandoux method (fractional) SWt = total water saturation (fractional) Sxo = water saturation in the invaded zone from any method (fractional)
TARwt% = tar weight (percent)
THICK = zone or layer thickness (ft or m)
Uma = computed matrix photoelectric absorption cross section (barns/cm3) UMA1 = photoelectric absorption cross section of 1st mineral (barns/cm3) UMA2 = photoelectric absorption cross section of 2nd mineral (barns/cm3) UMA3 = photoelectric absorption cross section of 3rd mineral (barns/cm3) USH = photoelectric absorption cross section in 100% shale (barns/cm3)
Vcl = bulk volume of clay (fractional) VISd = viscosity of dead oil (cp) VISg = viscosity of gas (cp) VISo = viscosity of live oil (cp) VISw = viscosity of water (cp) Vi = bulk volume of ith component of matrix rock (fractional) Vrock = bulk volume of rock matrix (fractional) Vsh = shale volume from any method (fractional) Vshc = shale volume corrected for nonlinear effects (fractional) Vshg = shale volume from gamma ray log (fractional) Vshmin = shale volume from minimum method (fractional) Vshs = shale volume from spontaneous potential log (fractional) Vshx = shale volume from density neutron crossplot method (fractional) Vsilt = volume of silt (fractional)
WCg = water cut for gas well (fractional) WCo = water cut for oil well (fractional) WGr = water gas ratio (fractional) WOr = water oil ratio (fractional) WS = water salinity input constant (ppm NaCl) WTrock = rock weight (tonnes/m2) WTsh = shale weight (tonnes/m2) WTsnd = sand weight (tonnes/m2) WToil = oil weight (tonnes/m2)
WTwtr = water weight (tonnes/m2)


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