Robert V. Everett Petrophysics

Glossary of terms used for output description

A B C D F G H I K L M N O P Q R S T V W Z

AVGE_CARB:Average carbonate over zone set by formation tops.

AVGE_CLAY:Average clay over zone set by formation tops.

AVGE_CLAY_PLUS_MUSC:Average clay plus muscovite over zone set by formation tops.

AVGE_QF:Average quartz plus feldspar over zone bounded by formation tops. Formation tops can be set in "TOPS".

AVGE_QFM:Average quartz plus feldspar plus muscovite over zone set by formation tops.

AVGE_QUARTZ:Average quartz over zone set by formation tops.

AVGE_TOC:Average total organic carbon over zone set by formation tops.

BEST_PERFS:suggested zone to perforate based on having some free fluid and no producible water.

BEST_PERFS_TO_TEST:suggested zone to perforate based on having free fluid (CMFF) greater than the HCPV (TPOR-BVW-0.015) and no producible water. Often similar to BEST_PERFS but works in oil wells as well as gas wells.

BFV_PRED:Total porosity minus free fluid pore space is the bound fluid pore space. This would include the water in the clays plus the water and hydrocarbon in the small capillaries that will not move unless a fracture job is applied.

BILL_HC_PHI:This is a simplistic number of 15%*HCPV. It is used to check the free fluid as it is usually close to the free fluid.

BVW_DS_CUTOFF:is a coefficient times the SW_DS_GAS. When the bulk volume water (Sw*TPOR) is greater than the cut-off, water is expected to be produced. (Aka Buckles number). The value of SW_DS_GAS is from John Nieto's Dean Stark work in the Montney formation. The formula is Sw = 0.00611299955+0.016284619/(POR_NIETO) and is assumed to provide irreducible water saturation; where POR_NIETO = (-0.000594)*RHOB_FE*1000+1.5948 and RHOB_FE is the bulk density in g/c3 that has been corrected for bad hole and is ready for Formation Evaluation.

BVW_DS_GAS:POR_NIETO* SW_NIETO

BVW_ECS:TPOR* SW_ECS

CAL:calcite abundance by weight.

CAL_DOLO:calcite plus dolomite abundance by weight.

CAP_HC:hydrocarbon in the capillaries that is bound or trapped by capillary forces.

CEC:cation exchange capacity summed from the CEC of each clay * abundance of each clay type.

CHL:chlorite abundance by weight.

CMFF_PRED:free fluid that is constrained between 0 and PHIE.

CORE:interval of core

DEAN_TOC:combined TOC by uranium and Nieto, where TOC_URAN = LOG((HURA/4)^1.85) * 5 and TOC_NIETO = (LOG_RT-0.3576)/0.79972*0.6 and DEAN_TOC = IF((IF(TOC_URAN<=0,0,(IF(TOC_URAN>TOC_NIETO,TOC_NIETO,TOC_URAN))))<=0,0, ((IF(TOC_URAN<=0,0,(IF(TOC_URAN>TOC_NIETO,TOC_NIETO,TOC_URAN)))))

DEPTH:depth in metres or feet

DOL:abundance of dolomite

DT_E:travel time in imperial units (E=English)

DT_IN:compressional travel time in English units that was input to spreadsheet.

DTS_IN:shear travel time in English units that was input to spreadsheet.

DWAL_RECON:dry weight aluminum reconstructed from the calculated minerals.

DWAL_WALK2_P:dry weight aluminum that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWCA_RECON:dry weight calcium reconstructed from the calculated minerals.

DWCA_WALK2_P:dry weight calcium that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWFE_MINUS_14WAL:dry weight iron minus 14%*aluminum that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWFE_RECON:dry weight iron reconstructed from the calculated minerals.

DWFE_RECON_PLUS_14WAL:dry weight iron plus 14% aluminum reconstructed from the calculated minerals.

DWFE_WALK2_P:dry weight iron that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWK_RECON :dry weight potassium reconstructed from the calculated minerals.

DWK_WALK2_P:dry weight potassium that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWSI_RECON:dry weight silicon reconstructed from the calculated minerals.

DWSI_WALK2_P:dry weight silicon that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWSU_RECON:dry weight sulphur reconstructed from the calculated minerals.

DWSU_WALK2_P:dry weight sulphur that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

DWTI_RECON:dry weight titanium reconstructed from the calculated minerals.

DWTI_WALK2_P:dry weight titanium that was input to the program. This input may have been a Predicted value or a measured value but the output is always with a "_P".

FELD:abundance of kspar plus plagioclase

FRAC_TREATMENT:depth interval for fracture treatment.

FREE_H2O_CMR:interval that the free fluid measurement (CMFF from CMR tool, for example) indicates that water is free to be produced.

FREE_H2O_SW_CRIT:interval that the free fluid measurement (CMFF from CMR tool, for example) indicates that water is free to be produced; it is from a critical water saturation perspective but is essentially the same calculation method as FREE_H2O_CMR

GAS_FLAG:indicates that the neutron (PHIN_MAN) is less than the density porosity (PHID_MAD).

GR_IN:Gamma ray used as input to spreadsheet program. The GR is not used so this is just for archival purposes.

H2O_BVW:a flag that indicates a zone where BVW > BVW_CUTOFF; water production is expected.

HCPV:Hydrocarbon pore volume = porosity *(1-Sw)

HCPV_CAPGAS:hydrocarbon pore volume that is occupied by gas in the small capillaries; no production expected unless fractured.

HCPV_CAPHC:hydrocarbon pore volume that is occupied by gas or oil in the small capillaries; no production expected unless fractured.

HCPV_OGIP_BCF:hydrocarbon pore volume that is occupied by gas or oil in the all pores, large, medium and capillaries, in BCF per section. Pressure used is 0.433*depth in ft.

HFK_P:potassium either predicted or measured that was input to the spreadsheet program. Identical to DWK_WALK2_P.

HTHO_IN:thorium that was input to the spreadsheet program.

HURA_IN:uranium that was input to the spreadsheet program.

ILL:illite abundance by weight%

ILL_PLUS_MUSC:illite plus muscovite abundance by weight%.

KAO:Kaolinite abundance by weight%.

KAO_ILL:kaolinite plus illite abundance by weight%.

KAO_ILL_CHL:kaolinite plus illite plus chlorite abundance by weight%.

KAO_ILL_CHL_MUSC:kaolinite plus illite plus chlorite plus muscovite abundance by weight%.

KAO_ILL_CHL_SME:kaolinite plus illite plus chlorite plus smectite abundance by weight%.

KAO_ILL_MUSC:kaolinite plus illite plus muscovite abundance by weight%.

KEROG_LOWER:a "place holder" for plotting.

KEROG_UPPER:a "place holder" for plotting.

KSPAR:potassium feldspar abundance by weight%.

LIVE_HCPV:the hydrocarbon pore volume that is free to produce in the sense that it does not include the hydrocarbon pore volume that is bound.

LIVE_HCPV_GRI:the hydrocarbon pore volume that is free to produce in the sense that it does not include the hydrocarbon pore volume that is bound. The "GRI" refers to the porosity volume, which is "adjusted" to match core porosity using the GRI porosity measurement methods.

M_NPHI:modeled neutron reconstruction, based on a calculated neutron matrix based on a thermal neutron response for each mineral. The fluid response is based on the [invaded] zone of investigation of the thermal neutron with whatever fluids are in that zone. Its use is intended to be a quality control factor for the minerals. If the modeled and the measured neutron agree, then the minerals are feasible.

MUSCOVITE_SUM:the sum of the muscovite from the total clay plus muscovite calculation minus the illite, kaolinite, smectite and chlorite.

NPHI_IN:input neutron of any kind.

OGIP_PAY1_NET:oil or gas in place with Pay1, which is suggested to be the net pay.

OGIP_PAY2:oil or gas in place with Pay2

OGIP_PAY3_GROSS:oil or gas in place with Pay3 which is suggested to be the gross pay.

OOIP_GRI_MMBO_HCPV:original oil in place using GRI porosity, in millions of barrels of oil, of hydrocarbon pore volume.

OOIP_MMBO_HCPV:original oil in place using total porosity (TPOR), in millions of barrels of oil, of hydrocarbon pore volume.

OOIP_PAY1_NET:original oil in place using total porosity (TPOR), in millions of barrels of oil, of hydrocarbon pore volume in the PAY1 pore space. This is suggested to be the net pay.

OOIP_PAY2:original oil in place using total porosity (TPOR), in millions of barrels of oil, of hydrocarbon pore volume in the PAY2 pore space.

OOIP_PAY3_GROSS:original oil in place using total porosity (TPOR), in millions of barrels of oil, of hydrocarbon pore volume in the PAY3 pore space. This is suggested to be the gross pay.

OOIP_SOR_HCPV:original oil in place estimating bitumen-porosity (calculated from the "crustal relationship of uranium and thorium"), in millions of barrels of oil, of hydrocarbon pore volume in the irreducible bitumen pore space. This is suggested to be the bitumen "pay".

PAY1_NET:H2O_BVW<1 & PHIE>= 0.06, is the suggestion for net.

PAY2:H2O_BVW<1 & PHIE>= 0.045

PAY3_GROSS :H2O_BVW<1 & PHIE>= 0.03, is the suggestion for gross pay.

PEFZ_USED:the input photoelectric effect value that is input to the program. It is used to separate calcite and dolomite.

PERFS:intervals where perforations have been made.

PERM_ECS:permeability derived from mineral surface area and total porosity, TPOR.

PERM_ECS_GRI:permeability derived from mineral surface area and total porosity, TPOR times 10^(-3).

PERM_KER_GRI:permeability derived from mineral surface area, kerogen and GRI porosity, TPOR_GRI.

PERM_NIETO:PERMEABILITY FROM THE Nieto equation for the Montney formation, PERM=14.42*POR_Nieto^2.5

PERM_NIETO_GRI:PERMEABILITY FROM THE Nieto equation for the Montney formation, PERM=(14.42*POR_Nieto^2.5)*10^(-3)

PHID_MAD:matrix-adjusted density porosity, where the matrix density is determined by elements.

PHIE:effective porosity, = TPOR*(1-SWB)

PHIE_6:a straight line at 6%

PHIN_MAN:matrix-adjusted neutron porosity, where the matrix is determined from elements.

PLAG:Plagioclase, where the assumption is 60% NaSpar and 40% CaSpar ~ oligoclase.

POR_NIETO:porosity from the Nieto Montney equation, DPOR= (-0.000594)*RHOB+1.5948, where RHOB is kg/m3

PRESSURE:based on 0.433*depth in feet unless otherwise stated.

PRESSURE_KPA:based on 0.433*depth in feet unless otherwise stated, converted to kilopascals.

Q_GAS_LOG:Flow rate of gas from simplified relative perm equations of gas and water.

Q_H2O_LOG:Flow rate of water from simplified relative perm equations of gas and water.

QP_H2O_LOG:instantaneous flow rate of water from simplified relative perm equations of gas and water.

QP_HC_LOG:instantaneous flow rate of hydrocarbons from simplified relative perm equations of gas and water.

QTZ_KSP:abundance in wt. % of quartz plus Kspar.

QUARTZ:abundance in wt.% of quartz

RATIO_PEF_CAL_DOLO:ratio of calcite to dolomite from the Pef curve where Pef of 3 is dolomite and Pef of 5.5 is calcite.

RATIO_PEF_DOL_CAL:ratio of dolomite to calcite from the Pef curve where Pef of 3 is dolomite and Pef of 5.5 is calcite.

RHOG_CLAY:grain density of clay minerals, no kerogen, in g/c3.

RHOG_CLAY_METRIC:grain density of clay minerals, no kerogen, in kg/m3.

RHOG_ECS:grain density of minerals, including kerogen when > 3.5%, in g/c3, calculated from elements.

RHOG_KER_GRI:grain density of minerals, with kerogen above 1.5%, in g/c3, for calculating porosity_GRI. Calculated from elements and kerogen.

RHOG_KER_GRI_METRIC:grain density of minerals, with kerogen above 1.5%, in kg/m3, for calculating porosity_GRI. Calculated from elements.

RHOG_METRIC:grain density of minerals, including kerogen when > 3.5%, in kg/m3

RHOG_RECON:grain density from computed minerals, including kerogen when > 3.5%, in g/c3.

RHOG_RECON_KER:grain density from computed minerals, including kerogen when > 1.5%, in g/c3.

RHOG_RECON_KER_METRIC:grain density from computed minerals, including kerogen when > 1.5%, in kg/m3.

RHOG_RECON_METRIC:grain density from computed minerals, including kerogen when > 3.5%, in kg/m3.

RHOZ_IN:input bulk density in g/c3.

RO:wet resistivity.

RO_KER_GRI:wet resistivity using GRI porosity and kerogen.

RT_IN:True resistivity input to program or a facsimile like deep resistivity.

RT_REC:Rt reconstructed.

RUTILE:TiO2 from input titanium.

RW_SP_USED:Formation water resistivity used in calculations of Ro and Sw_ECS.

SAL:Formation water salinity used in calculations of Ro and Sw_ECS.

SMEC:abundance of smectite in wt. %.

SOR:Residual oil in the form of bitumen, calculated from crustal relationship that 0.3*Th = U; excess uranium is assumed to be bitumen* a calibration factor.

SW_CRIT:Critical water saturation. When Sw exceeds Sw_Crit, water production is expected. Based on the free fluid porosity.

SW_DS_GAS:Nieto equation for water saturation of gas and water in the Montney. SW(Dean Stark)=0.010*TPOR^-1.09

SW_ECS:water saturation, using the ECS™ method based on the Dual Water Equation using cation exchange capacity [derived from clay minerals] and total porosity, TPOR.

SW_KER_GRI :water saturation, using the ECS™ method based on the Dual Water Equation using cation exchange capacity [derived from clay minerals] and GRI total porosity, TPOR_GRI.

SW_LTD:Sw_ECS limited to 1.0 and SWB.

SW_NIETO:based on the Nieto equation for the Montney, SW (Dean Stark) =0.010*Por_Nieto^(-1.09).

SWB:Bound water saturation based on CEC in the Dual Water Equation.

SWIRR:Irreducible water saturation from the Herron-Timur-Coates equation, Virr = TPOR/((PERM^0.25)/(10*(TPOR^0.5))+1). Swirr = Virr/TPOR.

TOC_NIETO:LOG(RT)=0.79972*TOC_NIETO+0.3576

TOC_USED:Selected TOC equation for calculations of adsorbed gas.

TPOR:Total porosity calculated from the density log, using 1.0 for fluid and RHOG_ECS [FROM ELEMENTS]

TPOR_KER_GRI:Total porosity calculated from the density log, using 1.0 for fluid and RHOG_KER [FROM ELEMENTS AND KEROGEN]

TPOR_VWB:total porosity minus the volume of bound water, TPOR*(1-SWB), equivalent to PHIE.

VIRR:Irreducible water saturation from the Herron-Timur-Coates equation, Virr = TPOR/((PERM^0.25)/(10*(TPOR^0.5))+1).

VWB:TPOR*(SWB), water bound in the clays.

WANH:abundance of anhydrite, derived from sulphur.

WCAR_WANH:abundance of carbonate minus anhydrite.

WCARB_ECS:abundance of carbonate.

WCARB_MUSC_WCLAY:abundance of carbonate plus muscovite plus clay.

WCARB_PLUS_KAO:abundance of carbonate plus kaolinite.

WCARB_PLUS_KAO_ILL:abundance of carbonate plus kaolinite plus illite.

WCARB_PLUS_KAO_ILL_CHL:abundance of carbonate plus kaolinite plus illite plus chlorite.

WCARB_PLUS_KAO_ILL_CHL_SME:abundance of carbonate plus kaolinite plus illite plus chlorite plus smectite.

WCARB_PLUS_WCLAY_NM:same as above, abundance of carbonate plus kaolinite plus illite plus chlorite plus smectite. NM means no muscovite.

WCLAY_CM:weight fraction of clay + muscovite using the Herron clay-mica model.

WCLAY_HF:weight fraction of clay + muscovite using the Herron high feldspar model.

WCLAY_LF:weight fraction of clay + muscovite using the Herron low feldspar model.

WCLAY_MUSC_CM:weight fraction of clay + muscovite using the Herron clay-mica model.

WCLAY_NO_MUSC:weight fraction of clay + no muscovite using any Herron clay model.

WMIN:used to estimate the fraction of each clay type from the separation of the neutron density porosity. Nominally water in the minerals but is modified, so it is not dimensionally correct but gives better definition; WMIN = (NPHI_IN - DPHI_2.71)/ (1-DPHI_2.71)*2.71 Dimensionally correct calculation is; WMIN = (NPHI_IN - DPHI_2.71)/ (1-DPHI_2.71)*1/2.71

WMIN_SMEC:water in smectite, dimensionally correct, with TNPH of high illite-smectite of ~23 and TNPH of kaolinite of 45, total TNPH is 68, 23/68*((PHIN_MAN - PHID_MAD)/ (1-PHID_MAD)*1/RHOG_APA_TOC). This ignores the abundance of chlorite and illite as we assume most of the neutron density separation is caused by the "H" in the "nH2O" of smectite and "4(OH)" of kaolinite. So this is just an approximation.

WPYR:abundance of pyrite, derived from sulphur.

WQF:abundance of quartz plus plagioclase plus kspar.

WQFM:abundance of quartz plus plagioclase plus kspar plus muscovite.

WQFM_LTD:abundance of quartz plus plagioclase plus kspar plus muscovite where the values are used as a quality control check on WQFM.

ZERO:a straight-line value for plotting.

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