PetroPy

A python petrophysics package allowing scientific python computing of conventional and unconventional formation evaluation. Reads las files using lasio. Includes a petrophysical workflow and a log viewer based on XML templates.

Requirements

• cchardet
• lasio
• numpy
• scipy
• pandas
• matplotlib
• scikit-learn

Installation

Install PetroPy through pip via the command line

pip install petropy

To read in an las file, pass the file reference:

import petropy as ptr
file_path = r'path/to/well.las'
log = ptr.Log(file_path)

Documentation

View the online documentation for classes and methods.

Las File Processing

To understanding using petropy in a petrophysical workflow for las file processing, see the example page.

Petrophysical Model Quick Look

>>> # import petropy and print raw curves
>>> import petropy as ptr
>>> log = ptr.log_data('WFMP')
>>> print(log.curves)

Mnemonic   Unit  Value         Description
--------   ----  -----         -----------
DEPT       F     00 000 00 00  1  Depth Curve
CALI       INCH  99 075 22 05  2  CALIPER
DPHI       DECP  99 075 22 05  3  DENSITY POROSITY -LIME-
GR         GAPI  99 075 22 05  4  GAMMA RAY
NPHI       DECP  99 075 22 05  5  NEUTRON POROSITY -LIME-
PE         B/E   99 075 22 05  6  PHOTO-ELECTRIC FACTOR
RHOB       G/C3  99 075 22 05  7  BULK DENSITY
PHIX       DECP  99 075 22 05  8  CROSSPLOT POROSITY
C13        INCH  99 075 22 05  9  CALIPER PADS 1 - 3    -FACT-
C24        INCH  99 075 22 05  10  CALIPER PADS 2 - 4    -FACT-
DT         US/F  99 075 22 05  11  SONIC TRANSIT TIME
SPHI       DECP  99 075 22 05  12  SONIC POROSITY  -LIME-
GR3              99 075 22 05  13  GAMMA RAY
ILD        OHMM  99 075 22 05  14  IL, DEEP RESISTIVITY
ILM        OHMM  99 075 22 05  15  IL, MEDIUM RESISTIVITY
SGRD       OHMM  99 075 22 05  16  SHORT GUARD RESISTIVITY
SP         MV    99 075 22 05  17  SPONTANEOUS POTENTIAL
CAL_N      INCH  99 075 22 05  9  CALIPER PADS 1 - 3    -FACT-
GR_N       GAPI  99 075 22 05  4  GAMMA RAY
RESMED_N   OHMM  99 075 22 05  15  IL, MEDIUM RESISTIVITY
RESDEEP_N  OHMM  99 075 22 05  14  IL, DEEP RESISTIVITY
NPHI_N     DECP  99 075 22 05  5  NEUTRON POROSITY -LIME-
DPHI_N     DECP  99 075 22 05  3  DENSITY POROSITY -LIME-
SPHI_N     DECP  99 075 22 05  12  SONIC POROSITY  -LIME-
PE_N       B/E   99 075 22 05  6  PHOTO-ELECTRIC FACTOR
RHOB_N     G/C3  99 075 22 05  7  BULK DENSITY
DTC_N      US/F  99 075 22 05  11  SONIC TRANSIT TIME
SP_N       MV    99 075 22 05  17  SPONTANEOUS POTENTIAL

>>> # read tops into Log object and print
>>> log.tops_from_csv()
>>> print(log.tops)

{'WFMPA': 6993.5, 'WFMPB': 7294.0, 'WFMPC': 7690.5, 'WFMPD': 8028.0}

>>> # load default parameters and print values
>>> log.fluid_properties_parameters_from_csv()
>>> print(log.fluid_properties_parameters.keys())

dict_keys(['default', 'WFMP'])

>>> # specificy formation intervals
>>> f = ['WFMPA', 'WFMPB', 'WFMPC']
>>> # calculate fluid properties for defined formations
>>> log.formation_fluid_properties(f, parameter = 'WFMP')
>>> # print curves for description of calculated curves
>>> print(log.curves)

Mnemonic    Unit  Value         Description
--------    ----  -----         -----------
DEPT        F     00 000 00 00  1  Depth Curve
CALI        INCH  99 075 22 05  2  CALIPER
DPHI        DECP  99 075 22 05  3  DENSITY POROSITY -LIME-
GR          GAPI  99 075 22 05  4  GAMMA RAY
NPHI        DECP  99 075 22 05  5  NEUTRON POROSITY -LIME-
PE          B/E   99 075 22 05  6  PHOTO-ELECTRIC FACTOR
RHOB        G/C3  99 075 22 05  7  BULK DENSITY
PHIX        DECP  99 075 22 05  8  CROSSPLOT POROSITY
C13         INCH  99 075 22 05  9  CALIPER PADS 1 - 3    -FACT-
C24         INCH  99 075 22 05  10  CALIPER PADS 2 - 4    -FACT-
DT          US/F  99 075 22 05  11  SONIC TRANSIT TIME
SPHI        DECP  99 075 22 05  12  SONIC POROSITY  -LIME-
GR3               99 075 22 05  13  GAMMA RAY
ILD         OHMM  99 075 22 05  14  IL, DEEP RESISTIVITY
ILM         OHMM  99 075 22 05  15  IL, MEDIUM RESISTIVITY
SGRD        OHMM  99 075 22 05  16  SHORT GUARD RESISTIVITY
SP          MV    99 075 22 05  17  SPONTANEOUS POTENTIAL
CAL_N       INCH  99 075 22 05  9  CALIPER PADS 1 - 3    -FACT-
GR_N        GAPI  99 075 22 05  4  GAMMA RAY
RESMED_N    OHMM  99 075 22 05  15  IL, MEDIUM RESISTIVITY
RESDEEP_N   OHMM  99 075 22 05  14  IL, DEEP RESISTIVITY
NPHI_N      DECP  99 075 22 05  5  NEUTRON POROSITY -LIME-
DPHI_N      DECP  99 075 22 05  3  DENSITY POROSITY -LIME-
SPHI_N      DECP  99 075 22 05  12  SONIC POROSITY  -LIME-
PE_N        B/E   99 075 22 05  6  PHOTO-ELECTRIC FACTOR
RHOB_N      G/C3  99 075 22 05  7  BULK DENSITY
DTC_N       US/F  99 075 22 05  11  SONIC TRANSIT TIME
SP_N        MV    99 075 22 05  17  SPONTANEOUS POTENTIAL
PORE_PRESS  psi                 Calculated Pore Pressure
RES_TEMP    F                   Calculated Reservoir Temperature
NES         psi                 Calculated Net Effective Stress
RW          ohmm                Calculated Resistivity Water
RMF         ohmm                Calculated Resistivity Mud Filtrate
RHO_HC      g/cc                Calculated Density of Hydrocarbon
RHO_W       g/cc                Calculated Density of Water
RHO_MF      g/cc                Calculated Density of Mud Filtrate
NPHI_HC     v/v                 Calculated Neutron Log Response of Hydrocarbon
NPHI_W      v/v                 Calculated Neutron Log Response of Water
NPHI_MF     v/v                 Calculated Neutron Log Response of Mud Filtrate
MU_HC       cP                  Calculated Viscosity of Hydrocarbon
BO                              Calculated Oil Formation Volume Factor
BP          psi                 Calcualted Bubble Point

>>> # load default multimineral parameters
>>> log.multimineral_parameters_from_csv()
>>> # print available default formation parameters
>>> print(log.multimineral_parameters.keys())

dict_keys(['default', 'WFMP'])

>>> # calculate mulitmineral model over defined formations
>>> # with parameter 'WFMP'
>>> log.formation_multimineral_model(f, parameter = 'WFMP')
>>> log.write('processed_log.las')
>>> # print curves for description of calculated curves
>>> print(log.curves)

Mnemonic    Unit   Value         Description
--------    ----   -----         -----------
DEPT        F      00 000 00 00  1  Depth Curve
CALI        INCH   99 075 22 05  2  CALIPER
DPHI        DECP   99 075 22 05  3  DENSITY POROSITY -LIME-
GR          GAPI   99 075 22 05  4  GAMMA RAY
NPHI        DECP   99 075 22 05  5  NEUTRON POROSITY -LIME-
PE          B/E    99 075 22 05  6  PHOTO-ELECTRIC FACTOR
RHOB        G/C3   99 075 22 05  7  BULK DENSITY
PHIX        DECP   99 075 22 05  8  CROSSPLOT POROSITY
C13         INCH   99 075 22 05  9  CALIPER PADS 1 - 3    -FACT-
C24         INCH   99 075 22 05  10  CALIPER PADS 2 - 4    -FACT-
DT          US/F   99 075 22 05  11  SONIC TRANSIT TIME
SPHI        DECP   99 075 22 05  12  SONIC POROSITY  -LIME-
GR3                99 075 22 05  13  GAMMA RAY
ILD         OHMM   99 075 22 05  14  IL, DEEP RESISTIVITY
ILM         OHMM   99 075 22 05  15  IL, MEDIUM RESISTIVITY
SGRD        OHMM   99 075 22 05  16  SHORT GUARD RESISTIVITY
SP          MV     99 075 22 05  17  SPONTANEOUS POTENTIAL
CAL_N       INCH   99 075 22 05  9  CALIPER PADS 1 - 3    -FACT-
GR_N        GAPI   99 075 22 05  4  GAMMA RAY
RESMED_N    OHMM   99 075 22 05  15  IL, MEDIUM RESISTIVITY
RESDEEP_N   OHMM   99 075 22 05  14  IL, DEEP RESISTIVITY
NPHI_N      DECP   99 075 22 05  5  NEUTRON POROSITY -LIME-
DPHI_N      DECP   99 075 22 05  3  DENSITY POROSITY -LIME-
SPHI_N      DECP   99 075 22 05  12  SONIC POROSITY  -LIME-
PE_N        B/E    99 075 22 05  6  PHOTO-ELECTRIC FACTOR
RHOB_N      G/C3   99 075 22 05  7  BULK DENSITY
DTC_N       US/F   99 075 22 05  11  SONIC TRANSIT TIME
SP_N        MV     99 075 22 05  17  SPONTANEOUS POTENTIAL
PORE_PRESS  psi                  Calculated Pore Pressure
RES_TEMP    F                    Calculated Reservoir Temperature
NES         psi                  Calculated Net Effective Stress
RW          ohmm                 Calculated Resistivity Water
RMF         ohmm                 Calculated Resistivity Mud Filtrate
RHO_HC      g/cc                 Calculated Density of Hydrocarbon
RHO_W       g/cc                 Calculated Density of Water
RHO_MF      g/cc                 Calculated Density of Mud Filtrate
NPHI_HC     v/v                  Calculated Neutron Log Response of Hydrocarbon
NPHI_W      v/v                  Calculated Neutron Log Response of Water
NPHI_MF     v/v                  Calculated Neutron Log Response of Mud Filtrate
MU_HC       cP                   Calculated Viscosity of Hydrocarbon
BO                               Calculated Oil Formation Volume Factor
BP          psi                  Calcualted Bubble Point
PHIE        v/v                  Effective Porosity
SW          v/v                  Water Saturation
SHC         v/v                  Hydrocarbon Saturation
BVH         v/v                  Bulk Volume Hydrocarbon
BVW         v/v                  Bulk Volume Water
BVWI        v/v                  Bulk Volume Water Irreducible
BVWF        v/v                  Bulk Volume Water Free
BVOM        v/v                  Bulk Volume Fraction Organic Matter
BVCLAY      v/v                  Bulk Volume Fraction Clay
BVPYR       v/v                  Bulk Volume Fraction Pyrite
VOM         v/v                  Matrix Volume Fraction Organic Matter
VCLAY       v/v                  Matrix Volume Fraction Clay
VPYR        v/v                  Matrix Volume Fraction Pyrite
RHOM        g/cc                 Matrix Density
TOC         wt/wt                Matrix Weight Fraction Organic Matter
WTCLAY      wt/wt                Matrix Weight Fraction Clay
WTPYR       wt/wt                Matrix Weight Fraction Pyrite
BVQTZ       v/v                  Bulk Volume Fraction Quartz
VQTZ        v/v                  Matrix Volume Fraction Quartz
WTQTZ       wt/wt                Matrix Weight Fraction Quartz
BVCLC       v/v                  Bulk Volume Fraction Calcite
VCLC        v/v                  Matrix Volume Fraction Calcite
WTCLC       wt/wt                Matrix Weight Fraction Calcite
BVDOL       v/v                  Bulk Volume Fraction Dolomite
VDOL        v/v                  Matrix Volume Fraction Dolomite
WTDOL       wt/wt                Matrix Weight Fraction Dolomite
OIP         wt/wt                Matrix Weight Fraction Dolomite