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The new urban development is an important priority in Egypt to face a rapid increase in the population during the last few decades. As a case study, the geotechnical assessment of the New Minia City is studied applying direct current (DC) resistivity technique. In the presented study, the DC resistivity data are interpreted to (i) characterize the subsurface layer distributions, (ii) deduce the subsurface structures considering the surface geological and structural setting and borehole information and (iii) predict geotechnical parameters of the bedrock based on empirical relationships. The inversion results of DC resistivity data indicate that a lens of clay is locally capping the fractured limestone in different parts of the area. The constructed geoelectrical cross-sections show that the limestone bedrock is highly fractured regarding many normal faults trending in the NW and NE directions. In an attempt to derive empirical relationships for predicting the geotechnical parameters, the inverted resistivity values of the fractured limestone were correlated with different geotechnical parameters, Rock Quality Designation (RQD) and Unconfined Compressive Strength (UCS). It is noticed that there are good correlations between the limestone resistivity values and geotechnical parameters obtained from borehole data applying linear relations. Accordingly, the results indicate that the DC resistivity method constitutes a valuable technique to introduce a preliminary geotechnical assessment for new urban areas.

Abu Madi Formation is a gas fertile rock unit in Nile Delta basin and the main gas production rocks in Baltim fields which located in the Mediterranean sea, north of Baltim city, Egypt. This rock unit in the study area contains two gas productive sand zones; these are zone III main and zone III lower. The lithologic components of Abu Madi Formation that defined from the diaporosity (density-neutron) cross-plot and the tri-porosity (RHOMAA-DTMAA) cross-plot, showing that, Abu Madi Formation consists mainly of sandstone, shale, shaly sandstone in some parts and calcareous material. The resultant petrophysical parameter values, revealed that, both zone III main and zone III lower in the area under investigation show potential in their petrophysical characteristics, as a fertile gas reservoir. Zone III lower shows the most advanced petrophysical characterisation as a desired reservoir, with lower value of shale volume of 4%, good effective porosity of 17% and higher value of hydrocarbon saturation of 70%. Finally, these reservoirs are bounded by two normal faults with remarkable displacement. The first fault located at south, strike E-W and dips toward the North, the other fault located north, trending NE-SW and dips to the north.

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