ELECTROMAGNETIC ASSESSMENT OF OPEN POROSITY AT DEPTHS BELOW BOREHOLE
Feasibility study of the porosity forecast in depth and in the interwell space from electromagnetic sounding data in the borehole vicinity and electrical well logs is carried out. The porosity data are synthesized from the laboratory study of the samples’ properties for two boreholes drilled in the Bishkek testing site. The porosity forecast in depth is carried out using the 1D inversion of magnetotelluric sounding data in the vicinities of boreholes. Different variants of the forecast in depth are compared. It is shown that taking into account both electromagnetic sounding resistivity and resistivity well logs enables increasing the forecast accuracy several times (the appropriate relative errors are, in average, around 2%).