Three simple rules were used: input parameters and input log curves are always UPPER case; output curves or output result values are MIXed case. There are no subscripts or superscripts, and Greek symbols are spelled ponetically As for all rules, there are exceptions, especially for output result values where commonly used abbreviations are well established, such as OOIP for original oil in place. Output curves from one calculation step are often input curves for a succeeding calculation, but the inout curve does not become upper case, because it is still an output curve from the prior step. For example: DENS or PHID or RESD are input log curves DENSMA or CPERM are an input analysis parameters DENSma or PHIe are output log curves and could be inputs to another calculation Reserves or OOIP are output result values Computer software needs to distinguish between a log curve and a parameter value. Each software package does this in different ways. For example, the distinction is declared in some packages, or a special symbol may be used to define a loog cure, such as [ ] after the curve name.
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Log Curve Alias Table
Abbreviations for Log Analysis
LIST of abbreviations
Nomenclature - Log Analysis CalculationsBVWSH = bulk volume of water bound to 100 % shale (fractional) 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) DENS = density log reading (gm/cc or kg/m3) DENSc = density log reading corrected for shale (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) DEPTH = formation depth (ft or m) 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) KBUCKL = Buckles number (porosity saturation product - fractional) KCP = sonic log compaction factor (fractional) Min1 = bulk volume of 1st mineral (fractional) Min2 = bulk volume of 2nd mineral (fractional) PE = effective photoelectric cross section (barns/cm3) PE1 = PE log reading in 1st mineral (barns/cm3) PE2 = PE log reading in 2nd mineral (barns/cm3) PESH = photoelectric log reading in 100% shale (barns/electron) PHIbvw = effective porosity from BVW method (fractional) PHID = density log reading (fractional)PHIdc = porosity from density log corrected for shale (fractional) PHIDSH = density log reading in 100% shale (fractional) PHIe = effective porosity (fractional) PHIMAX = maximum expected porosity in clean rock (fractional) PHIN = neutron porosity log reading (fractional) PHInc = neutron porosity corrected for shale (fractional) PHIs = total porosity from sonic log (fractional) PHIsc = porosity from sonic log corrected for shale (fractional) PHISSH = sonic porosity of 100% shale (fractional) PHIt = total porosity (fractional) PHIxnd = porosity from density neutron crossplot (fractional) RESD = deep resistivity log reading (ohm-m) Rwa = apparent water resistivity (ohm-m) RWSH = water resistivity of water bound to shale (ohm-m) 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) Sw = calculated water saturation from any method (fractional) Vsh = shale volume from any method (fractional) Vshg = shale volume from gamma ray log (fractional) Vshs = shale volume from spontaneous potential log (fractional) Vshx = shale volume from density neutron crossplot method (fractional)
Nomenclature - Seismic Calculations |
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