Potash Mineralogical Estimates by Well-Logs in Hansera Evaporite Formations of Bikaner-Nagaur Basin

Geophysical logs responses evaluation can provide mineralogical estimates of potash ores. Estimates for different mineral fractions like sylvite, halite, carnallite, polyhalite etc. and insoluble are obtained by analysis of each minerals log response on different logs. Log analysis of multilogs containing gamma, dual-density, neutron, caliper, resistivity logs were performed in all the boreholes in Lakhasar, Jaitpur and Bharusari potash sub basins within the Bikaner-Nagaur basin.

A successful attempt has been made to differentiate different minerals associated in halite zone into potash and non-potash bearing. In addition to this the estimate of the percentage of K2O and hence that of K has been made by recalibrating the laboratory results with the gamma ray counts which shows a close agreement with the percentage of K2O estimated by international developed formula.

The potash evaluation technique by multi-parametric logs has been successfully applied to evaluate potash rich intervals in Hansera evaporite sequences and to distinguish economic potash minerals from non-economic as well as the other non-radioactive minerals.