Method and system for calculating extent of a formation treatment material in a formation

A system comprising:

• a neutron source that releases neutrons in a formation;
• a gamma detector that senses energies of gammas produced by materials in the formation;
• a processor electrically coupled to the neutron source and the gamma detector, wherein the processor:
• analyzes a measured spectrum of the energies of the gamma against a basis matrix;
• and based on the analysis
• determines elemental concentrations of the materials in the formation;
• and
• calculates an axial extent of a formation treatment material in the formation in relation to an axis of a borehole based on the elemental concentration of at least some materials in the formation.

A non-transitory computer-readable storage media storing a program that, when executed by a processor of a logging system, causes the processor to:

• obtain a measured spectrum of energies of gammas produced by material in a formation;
• analyze the measured spectrum of energies of gamma produced by materials in the formation against a basis matrix;
• determine elemental concentrations of the materials in the formation;
• and
• calculate axial extent of a formation treatment material in the formation in relation to an axis of a borehole based on the elemental concentrations of at least some materials in the formation.

A system comprising:

• a neutron source that releases neutrons in a formation;
• a first gamma detector spaced a first distance from the neutron source;
• a second gamma detector spaced a second distance from the neutron source, the second distance greater than the first distance;
• the first gamma detector and the second gamma detector sense energies of gammas produced by materials in the formation;
• a processor electrically coupled to the first gamma detector and the second gamma detector, wherein the processor:
• analyzes a measured spectrum of the energies of the gammas sensed by the second gamma detector with a first basis spectrum;
• and
• determines elemental concentrations of the materials in the formation.