Appendix D Symbols D-10 Standard Standard Standard Tra di ti on al SPE computer Description Customary unit or relation reserve symbol and symbol a symbol b SPWLA a a a ACT electrochemical activity equivalents/liter , moles/liter a K R COER coefficient in F R – φ relation F R = K R / φ m M R , a, C A A AWT atomic weight amu C C ECN conductivity (electrical logging) millimho per meter (mmho/m) σ C p B cp CORCP sonic compactio n correcti on factor φ SVcor = B cp φ SV C cp D D DPH depth ft, m y, H d d DIA diameter in. D E E EMF electromotive force mV V F F R F ACHR formation resistivity factor F R = K R / φ m G G GMF geometrical factor (multiplier) f G H I H HYX hydrogen index i H h h THK bed thickness, individual ft, m, in. d, e I I –X index i FFI I Ff FFX free fluid index i Ff SI I sl SLX silt index I slt , i sl , i slt I φ PRX porosity index i φ SPI I φ2 PRXSE secondary porosity index i φ2 J G p GMFP pseudogeometrical factor f Gp K K c COEC electrochemical SP coefficient E c = K c log (a w /a mf ) M c , K ec k k PRM permeability, absolute (fluid flow) md K L L L TH length, path length ft, m, in. s, l M M SAD slope, sonic interval transit time versus M = [(t f – t LOG )/(ρ b – ρ f )] × 0.01 m θD density × 0.01, in M-N plot m m MXP porosity (cementation) exponent F R = K R / φ m N N SND slope, neutron porosity versus N = (φ Nf – φ N )/(ρ b – ρ f ) m φND density, in M-N Plot n n SXP saturation exponent S w n = F R R w /R t P C CNC salinity g/g, ppm c, n p p PRS pressure psi, kg /cm 2 c , atm P P c P c PRSCP capillary pressure psi, kg/cm 2 c , atm P c , p c P e photoelectric cross section a Refe renc es: “S PE Le tter and Co mput er Symbols S tand ard, ” 1986 . b Reserve sy mbols are to be u sed only if conflic t arises between st andard sym bols used in the sa me pape r. c The unit, kilograms per square centime ter, is to be replaced in use b y the SI metric u nit, the p ascal. d “DEL ” is in t he op erat or fie ld. “R AD” is in the mai n-qu anti ty fie ld. e Sugges te d co mp ut er s ymbol.

Symbols 1

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símbolos usado en la industria petrolera

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Appendix D Symbols

D-10

Standard Standard StandardTraditional SPEcomputer Description Customary unit or relation reserve

symbol andsymbola symbolbSPWLAa

a a ACT electrochemical activity equivalents/liter, moles/liter

a KR COER coefficient in FR f relation FR = KR/f m MR, a, C

A A AWT atomic weight amu

C C ECN conductivity (electrical logging) millimho per meter (mmho/m) sCp Bcp CORCP sonic compaction correction factor f SVcor = Bcp f SV CcpD D DPH depth ft, m y, H

d d DIA diameter in. D

E E EMF electromotive force mV V

F FR FACHR formation resistivity factor FR = KR/f m

G G GMF geometrical factor (multiplier) fGH IH HYX hydrogen index iHh h THK bed thickness, individual ft, m, in. d, e

I I X index i

FFI IFf FFX free fluid index iFfSI Isl SLX silt index Islt, isl, islt

If

PRX porosity index if

SPI If 2 PRXSE secondary porosity index if 2

J Gp GMFP pseudogeometrical factor fGpK Kc COEC electrochemical SP coefficient Ec = Kc log (aw/amf) Mc, Keck k PRM permeability, absolute (fluid flow) md KL L LTH length, path length ft, m, in. s, lM M SAD slope, sonic interval transit time versus M = [(t f t LOG)/(r b r f)] 0.01 mq D

density 0.01, in M-N plot

m m MXP porosity (cementation) exponent FR = KR/f mN N SND slope, neutron porosity versus N = (f Nf f N)/(r b r f) mf ND

density, in M-N Plot

n n SXP saturation exponent Swn = FRRw/RtP C CNC salinity g/g, ppm c, n

p p PRS pressure psi, kg/cm2c, atm P

Pc Pc PRSCP capillary pressure psi, kg/cm2c, atm Pc, pcPe photoelectric cross section

a References: SPE Letter and Computer Symbols Standard, 1986.b Reserve symbols are to be used only if conflict arises between standard symbols used in the same paper.c The unit, kilograms per square centimeter, is to be replaced in use by the SI metric unit, the pascal.d DEL is in the operator field. RAD is in the main-quantity field.e Suggested computer symbol.