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Fix Simandoux Sw exponent and mud-filtrate salinity input #12

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Fix Simandoux Sw exponent and mud-filtrate salinity input #12

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2f25df2
Fix Simandoux Sw exponent and mud-filtrate salinity input
dougchristie May 23, 2026
9c38db8
Fix blank porosity track: use nanmean for auto Buckles parameter
dougchristie May 26, 2026
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10 changes: 5 additions & 5 deletions petropy/log.py
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Original file line number Diff line number Diff line change
Expand Up @@ -492,7 +492,7 @@ def fluid_properties(self, top = 0, bottom = 100000, mast = 67,
rmf = (rmft + 6.77) / (form_temp + 6.77) * rmfs

rw68 = (rwt + 6.77) / (68 + 6.77) * rws
rmf68 = (rmft + 6.77) / (68 + 6.77) * rws
rmf68 = (rmft + 6.77) / (68 + 6.77) * rmfs

### weight percent total disolved solids ###
xsaltw = 10 ** (-0.5268 * (np.log10(rw68) ) ** 3 - 1.0199 * \
Expand Down Expand Up @@ -1254,7 +1254,7 @@ def multimineral_model(self, top = None, bottom = None,

e &= \\frac{c}{RESDEEP\_LOG}

SW &= ((d^2 + e)^2 - d)^{\\frac{2}{n}}
SW &= (\sqrt{d^2 + e} - d)^{\\frac{2}{n}}

III. Modified Simandoux

Expand Down Expand Up @@ -2113,7 +2113,7 @@ def multimineral_model(self, top = None, bottom = None,
c = (1.0 - vclay) * a * self['RW'][i] / (phis ** m)
d = c * vclay / (2.0 * rt_clay)
e = c / self['RESDEEP_N'][i]
sw_simandoux = np.clip(((d**2 + e) ** 0.2 - d) ** \
sw_simandoux = np.clip(((d**2 + e) ** 0.5 - d) ** \
(2 / n), 0, 1)

### modified Simandoux ###
Expand Down Expand Up @@ -2251,8 +2251,8 @@ def multimineral_model(self, top = None, bottom = None,
### since parameters depend on calculated values ###

if buckles_parameter < 0:
buckles_parameter=np.mean(self['PHIE'][depth_index] * \
self['SW'][depth_index])
buckles_parameter=np.nanmean(self['PHIE'][depth_index] * \
self['SW'][depth_index])

ir_denom = (self['PHIE'][depth_index] / \
(1 - self['VCLAY'][depth_index]))
Expand Down