METHOD FOR DETERMINATION OF LITHIUM IN RAPOSATURATED INTERVALS OF GEOLOGICAL SECTIONS OF WELLS OF GAS CONDENSATE FIELDS ACCORDING TO THE DATA OF MULTI-METHOD MULTI-PROBE NEUTRON LOGGING Russian patent published in 2022 - IPC G01V5/10 G01V5/14 G01V11/00 

FIELD: nuclear-physical researching.

SUBSTANCE: invention relates to the field of nuclear-physical methods of researching wells for the purpose of prospecting and exploration of lithium in brine as a source of hydromineral raw materials in salt-bearing sections discovered by wells for various purposes. According to the claimed method, the intensities of thermal neutron fluxes are registered on a small – Jnnl_sp and large – Jnnl_lp probes of the neutron-neutron logging method - 2NNL and the intensity of the gamma radiation flux in the hard part of the PNC spectrum with an energy of more than 2.23 MeV - Jsngk is registered. The porosity function F(Kp), the saturation function F(H)nc and F(H)cnc are calculated according to the attached formulas. Then, dependences are plotted on cross-plots F(H)nnl from F(Kp), F(H)snc from F(Kp), the upper points of which are approximated by the function F(max)nnl = a⋅F(Kp)2 ± b⋅F(Kp) and F(max)sngc = a⋅F(Kp)2 ± b⋅F(Kp). Then the values ​​of the current content of chlorine and lithium obtained by 2NNL - Snnl, and the values ​​of the current content of chlorine and lithium obtained by SNGK - Ssngk are determined. Intervals containing lithium are determined by low values ​​of readings on small Jnnl_sp and large Jnnl_lp probes 2NNL and SNGKt probes, and by high F(Kp) readings when Snnk values ​​exceed Csngk values, while intervals containing lithium are characterized as zones with anomalously high reservoir pressure (AHRP).

EFFECT: increasing the reliability of assessing the content of lithium in the brine of salt-bearing deposits of oil and gas wells and forecasting zones with abnormally high pressure - AHP.

2 cl, 3 dwg