diff --git a/ApplicationCode/ProjectDataModel/Rim3dWellLogExtractionCurve.cpp b/ApplicationCode/ProjectDataModel/Rim3dWellLogExtractionCurve.cpp
index 025c45261c..5b7caaa934 100644
--- a/ApplicationCode/ProjectDataModel/Rim3dWellLogExtractionCurve.cpp
+++ b/ApplicationCode/ProjectDataModel/Rim3dWellLogExtractionCurve.cpp
@@ -336,25 +336,7 @@ double Rim3dWellLogExtractionCurve::rkbDiff() const
 
     if (wellPath && wellPath->wellPathGeometry())
     {
-        RigWellPath* geo = wellPath->wellPathGeometry();
-
-        if (geo->hasDatumElevation())
-        {
-            return geo->datumElevation();
-        }
-
-        // If measured depth is zero, use the z-value of the well path points
-        if (geo->m_wellPathPoints.size() > 0 && geo->m_measuredDepths.size() > 0)
-        {
-            double epsilon = 1e-3;
-
-            if (cvf::Math::abs(geo->m_measuredDepths[0]) < epsilon)
-            {
-                double diff = geo->m_measuredDepths[0] - (-geo->wellPathPoints()[0].z());
-
-                return diff;
-            }
-        }
+        return wellPath->wellPathGeometry()->rkbDiff();
     }
 
     return HUGE_VAL;
diff --git a/ApplicationCode/ProjectDataModel/RimWellLogExtractionCurve.cpp b/ApplicationCode/ProjectDataModel/RimWellLogExtractionCurve.cpp
index dcad7a8e73..56cc3bd9db 100644
--- a/ApplicationCode/ProjectDataModel/RimWellLogExtractionCurve.cpp
+++ b/ApplicationCode/ProjectDataModel/RimWellLogExtractionCurve.cpp
@@ -858,27 +858,8 @@ double RimWellLogExtractionCurve::rkbDiff() const
 {
     if (m_wellPath && m_wellPath->wellPathGeometry())
     {
-        RigWellPath* geo = m_wellPath->wellPathGeometry();
-
-        if (geo->hasDatumElevation())
-        {
-            return geo->datumElevation();
-        }
-
-        // If measured depth is zero, use the z-value of the well path points
-        if (geo->m_wellPathPoints.size() > 0 && geo->m_measuredDepths.size() > 0)
-        {
-            double epsilon = 1e-3;
-
-            if (cvf::Math::abs(geo->m_measuredDepths[0]) < epsilon)
-            {
-                double diff = geo->m_measuredDepths[0] - (-geo->m_wellPathPoints[0].z());
-
-                return diff;
-            }
-        }
+        return m_wellPath->wellPathGeometry()->rkbDiff();
     }
-
     return HUGE_VAL;
 }
 
diff --git a/ApplicationCode/ReservoirDataModel/RigWellPath.cpp b/ApplicationCode/ReservoirDataModel/RigWellPath.cpp
index 73697b9d73..65fe1c9bf8 100644
--- a/ApplicationCode/ReservoirDataModel/RigWellPath.cpp
+++ b/ApplicationCode/ReservoirDataModel/RigWellPath.cpp
@@ -56,6 +56,32 @@ double RigWellPath::datumElevation() const
     return m_datumElevation;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+double RigWellPath::rkbDiff() const
+{
+    if (hasDatumElevation())
+    {
+        return datumElevation();
+    }
+
+    // If measured depth is zero, use the z-value of the well path points
+    if (m_wellPathPoints.size() > 0 && m_measuredDepths.size() > 0)
+    {
+        double epsilon = 1e-3;
+
+        if (cvf::Math::abs(m_measuredDepths[0]) < epsilon)
+        {
+            double diff = m_measuredDepths[0] - (-wellPathPoints()[0].z());
+
+            return diff;
+        }
+    }
+    return HUGE_VAL;
+}
+
+
 //--------------------------------------------------------------------------------------------------
 /// 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationCode/ReservoirDataModel/RigWellPath.h b/ApplicationCode/ReservoirDataModel/RigWellPath.h
index 7280a9a563..aa5a3caba8 100644
--- a/ApplicationCode/ReservoirDataModel/RigWellPath.h
+++ b/ApplicationCode/ReservoirDataModel/RigWellPath.h
@@ -44,6 +44,7 @@ public:
     void                        setDatumElevation(double value);
     bool                        hasDatumElevation() const;
     double                      datumElevation() const;
+    double                      rkbDiff() const;
     cvf::Vec3d                  interpolatedVectorAlongWellPath(const std::vector<cvf::Vec3d>& vectors,
                                                                 double measuredDepth,
                                                                 double * horizontalLengthAlongWellToStartClipPoint = nullptr) const;