Petrophysical inversion of resistivity logging data

摘要

Inversion is a powerful tool for interpreting resistivity-logging data in complex situations,such as deep invasion, high conductive shoulders, thin beds, anisotropic formations, and highly deviated and horizontal wells. Inversion also provides a general means to interpret data from earlier, unfocused resistivity tools as well as the new generation of array-type instruments, allowing for accurate delineation of the resistivity structure. Although, in most cases, inversion produces solutions that are consistent with petrophysics and geology, there are occasions where consistency is not achieved. In order to address these inconsistencies, we have developed a petrophysical inversion algorithm that involves gamma ray, neutron, density, acoustic, and resistivity dat ain a single, unified interpretation process.