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Abstract INTRODUCTION The increasing demand for the petroleum pro11ucts and the discovery <)f large amounts of hydrocarbons in the subsurface led to a continuous development in the techniquee used for understanding the subsurface geology of the earth-s t::rust, This work deals with the geophysical methods of etudying ro(.:ks, based on the existence of some relationships between a eertain physical property of the rock and its different mineralogical, sedimentologic,”tl structura 1 and fluid properties. The direct examination and the application of various laboratory techniques on rock samples is considered the most appropriate method for studying the petrophyeical properties. The collection of eubsurface cores is an expensive process, taking into consideration that only few horizons can be eored in a certain sequence. Most of the availabl~ rock samples are in the form of cuttings which cannot give reliable results specially those describing the 13t.orage <:;apacity of a rock, This lead to development of various logging techniques in order to measure the petrophysical and t.he petrogr.~phical parameters based on some physical properties of the drilled rock sequence. These well logging techniquel3 provide various data which can be further processed for the qu.~litativ~ and qu~ntitative evaluation of lithology, porosity and saturation. Well logging methods also have t.he advantage of enabling accurate detet·mination of lithostratigraphic bound.’3.ries. One of the targets of thie study is the reinterpretation of lithology using different electric logs ·Of eigtheen wells and the correlation of the obtained results with the available data XV |