FIELD: physics; gas industry.
SUBSTANCE: invention relates to the field of nuclear-physical methods of investigating gas wells, to methods for assessing gas saturation of reservoirs, the pore space of which, along with gas, contains halite (salt). Disclosed is a method for estimating gas saturation of halitized reservoirs by recording and processing readings of double-probe pulse neutron-neutron logging of wells — 2PNNLg by thermal neutrons. Integral neutron fluxes J are recorded on small (SP PNNLg) and large (LP PNNLg) probes with calculation of porosity function — F(Kp)PNNLg and neutron flux decay rates on SP — SigSP and LP — SigLP probes. GC data are recorded, cross-dense constructions of the following type are performed in Cartesian coordinates: 
from F(Kp)PNNLg, 
from F(Kp)PNNLg, SigSP from F(Kp)PNNLg, SigLP from F(Kp)PNNLg, saturation function Pdd for SP — 
and LP — 
and neutron flux damping decrements for SP — PddSigSP and LP — PddSigLP are calculated. Pdd cross-plots are constructed from F(Kp)PNNLg, and cross-dense distributions are processed according to the attached formulas, as a result of calculations, the following geological parameters are determined: W is total volume content of gas and salt in the reservoir, %, Wsalt is volume content of salt, %, Wg is volume content of gas, %.
EFFECT: increased reliability of evaluation of gas saturation of halitized reservoirs.
4 cl, 7 dwg
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