| 摘要 |
FIELD: physics, geophysics.SUBSTANCE: invention relates to nuclear geophysics and is used for estimation of cement stone density of buried gas storages in their operation without lifting of oil-well tubing. Claimed method comprises measurement of current magnitudes A as Ca/Si ratio in wells by devices of wide-band spectrometric neutron gamma-logging, selection of Aand Aof Ca/Si) ratio, and determination of double difference parameter from measurement results (DDP) by formulaSpectrometer calibration is performed by static method based on interrelations between double difference parameter (DDP) and magnitudes of density boundaries of normal cement stone selected from the condition: maximum magnitude 1 of DDPcorresponds to density of cement stone - 1.95 g/cm- upper boundary of normal cement stone density, mean magnitude of 0.57 DDPcorresponds to current density of cement stone - 1.65 g/cm- lower boundary of cement stone density. Density of gamma-radiation (?) is calculated by the formula: ?=1.25+0.7 DDP.EFFECT: higher accuracy of data.3 dwg |
