Logging On In-situ Leaching Of Sandstone Type Uranium Deposit Exploration Research

Uranium was the main material of nuclear fission.Uranium ore was the main source of refining uranium resources,which was playing an important role in the national military,economy,people's livelihood.In uranium exploration,geophysical well logging was an important method.The workspace area belongs to a secondary structure unit of the North China plate,in the transition part of the northern North China epicontinental hyperplasia belt and the North China massif,which is on the Paleozoic fold basement development in the meso-cenozoic down-faulted basin.Basin evolution controlled the uranium source supply,which leaded to format fault sequence and rich uranium deposits,to occur to the secondary seeping oxidation,to occur to the enrichment of uranium,precipitation,to format the sandstone uranium deposit,and to occur to the secondary enrichment or destruction of uranium.In this whole process of transformation,the evolution of the different stage had different role in the formation of sandstone uranium deposits.In this paper,logging 21 holes,a total of 10581.79 m,was completed in this work,which contains repeating logging 955.37 m and inspection logging 1302.92 m.This logging method was FD-3019 Gamma ray log,density log,three direction density log,hole diameter log and hole deviation log.In this work,the well logging system was JHQ-2D digital logging system,which was produced by Shanghai geology instrument institute.Most of the function was concentrated in the interior of the down-hole instrument,transmitting digital signal to the ground.The logging system,having a high degree of integration,strong resistance to interference,was the current domestic advanced uranium logging system.Three down-hole instrument was used in this work:FD-3019 logging tool was mainly used for five point explained method of deconvolution to determine the position of ore block,grade and thickness.JMZ-2D density combination logging tool was mainly used to drill lithology,to distinguish the permeable and impermeable rock seam.Caliper data was FD-3019 quantitative interpretation correction parameters.JJX-3DA type high-precision inclinometer was used to check the quality of the well,to calculate the curvature correction calculationtable.These several geophysical methods was used to complete the single well gamma logging interpretation,to divide into single borehole lithological profile.And drilling the whole work area was used to study the sandstone thickness,mudstone roof and floor,which was connected to the sandstone section roughly in this work area.Combining with single hole log interpretation results,the size of the ore body space distribution was deduced roughly,which provided the important clues and prospecting basis for the next step of work.