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

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 - Jnnlspand large - Jnnllpprobes 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 Jnnlspand large Jnnllpprobes 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 Изобретение относится к области ядерно-физических методов исследований скважин с целью поиска и разведки лития в рапе как источника гидроминерального сырья в соленосных разрезах, вскрытых скважинами различного назначения. Согласно заявленному способу осуществляют регистрацию интенсивностей потоков тепловых нейтронов на малом - Jннкмзи большом - Jннкбззондах метода нейтрон-нейтронного каротажа - 2ННКт и регистрацию интенсивности потока гамма излучения в жесткой части спектра ГИРЗ с энергией более 2,23 МэВ - Jснгк. Производят вычисление функции пористости F(Kп), функции насыщения F(H)ннк и F(H)снгк по прилагаемым формулам. Осуществляют построение на кросс-плотах F(H)ннк от F(Kп), F(H)снгк от F(Kп) зависимостей, верхние точки которых аппроксимируют функцией F(мах)ннк = a⋅F(Kп)2± b⋅F(Kп) и F(мах)снгк = a⋅F(Kп)2± b⋅F(Kп). Затем