ةعيبطب اهرثأت مدعب نورتينلاو ةفاثكلا لثم اهيلع فراعتملا تلايجستلا نع ىسيطانغملا نينرلا تلايجست زيمتت ةقد رثآأو حضوأ ةقيرطب اهل ةعبشملا لئاوسلاو ةيماسملا ىسيطانغملا نينرلا تلايجست سكعت ىلاتلابو روخصلا . مدقي ىسيطانغملا نينرلا تلايجستب ةصاخلا تاقوعملا ىشاحتل ةجردب ةيماسملا باسحل ةديدج ةقيرط ثحبلا اذه نيدرفنم ةفاثكلا وأ ىسيانغملا نينرلا مادختسأ نم ةقد رثآأ . نينرلا لمشي ديدج لمامعم ىلع دمتعت ةقيرطلا هذهو ىمسيو ةفاثكلا و ىسيطانغملا ) ر م د . ( قد ىدم جئاتنلا تتبثاو رابلآا نم ديدعلا ىلع ديدجلا لماعملا اذه قيبطت مت ة لمعملا ىف ةساقملا ةيماسملاب ةنراقم لماعملا . مادختسلأ ىوقلا معدلا دآؤي جاتنتسلأا اذهو ) ر م د ( نم لادب ىسيطانغملا نينرلا وأ ةفاثكلا تلايجست نم ىلأ درفنملا مادختسلأا . Nuclear magnetic resonance (NMR) logs differ from conventional neutron, density, sonic and resistivity logs because the NMR measurements provide information only on formation fluids and are generally insensitive to matrix properties. The main task of formation evaluation is to calculate accurate formation porosities, permeabilities and identify properly the nature and amount of saturating fluids (water, oil, gas). The focus of this paper is to present an empirical method in which density and NMR porosities are combined and calibrated to core. The new porosity is termed DMR (density-magnetic resonance) porosity. Historically, neutron/density measurements have been used to derive formation porosity. While this yields acceptable results in clean liquid-filled lithologies (sands), the effects of lithology, hydrocarbon fill (gas), and formation heterogeneity in shaly sands increases the uncertainty in computed porosities. The technique of using combined NMR relaxation times and bulk density data described in this paper significantly reduces uncertainty in derived logging parameters through elimination of the neutron log. This removes the need to characterize, and correct for flushed zone fluid densities. This paper describes the application of DMR technique in cored wells in the Obaiyed field; Western Desert, Egypt and it discuss the results obtained, limitations and benefits, along with the data acquisition requirements. Field examples demonstrate the importance of the (DMR) technique in place of the use of NMR or conventional logs separately in determining formation porosity and gas saturation in tight gas sand reservoirs.