A METHOD OF DETERMINING THE BULK STRENGTH OF STRATA

摘要

The bulk strength of rocks in strata is determined by logging a borehole with a neutron-neutron or neutron- gamma log to determine the Hydrogen Index log of the borehole and the lithology of the surrounding strata. The log is modified by a predetermined mathematical function for each lithology group of rocks in the strata. The bulk strength of each individual rock in the lithology is calculated from the modified hydrogen log using a polynominal expression.