Shoulder bed effects removal

A method for removing shoulder-bed effects from measurements of an earth formation made in a wellbore, comprising:

• executing, via a processor, program instructions capable of:
• receiving the measurements;
• constructing a layered model of the earth formation, wherein each layer has five parameters corresponding to one or more types of the received measurements ascribed to each layer such that the five parameters define a five dimensional parameter space for the layered model;
• dividing the five dimensional parameter space into subspaces based on relationships among the five parameters;
• selecting from the subspaces one or more starting points;
• minimizing a cost function using the one or more starting points to generate one or more candidate solutions having the shoulder-bed effects removed;
• and
• selecting a final solution from the one or more candidate solutions.

A method for removing shoulder-bed effects from measurements of an earth formation made in a wellbore, comprising:

• executing, via a processor, program instructions capable of:
• receiving the measurements;
• constructing a layered model of the earth formation, wherein each layer has six parameters corresponding to one or more types of the received measurements ascribed to each layer such that the six parameters define a six dimensional parameter space for the layered model;
• dividing the six dimensional parameter space into subspaces based on relationships among the six parameters;
• selecting from the subspaces one or more starting points;
• minimizing a cost function using the one or more starting points to generate one or more candidate solutions having the shoulder-bed effects removed;
• and
• selecting a final solution from the one or more candidate solutions.