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利用埃及尼罗河三角洲El-Wastani气田10口气井的测井数据,对该气田主要储集层上中新统Qawasim组和Abu Madi组进行岩石物理分析,利用测井参数交会图进行岩性分析,并评估泥质含量、孔隙度、含水饱和度、含油气孔隙体积等参数。分析各井中子孔隙度-密度交会图、中子孔隙度-无铀伽马交会图和岩性-饱和度交会图发现:下Abu Madi组主要为砂岩,偶夹页岩;Qawasim组主要为页岩,偶夹砂岩。利用参数交会图及无铀伽马测井结果,得到有效产层各参数的临界值分别为:泥质含量50%,孔隙度10%,含水饱和度70%。分别绘制了产层有效厚度、平均孔隙度、泥质含量、含水饱和度等参数的等值线图,综合分析发现,研究区Qawasim组和Abu Madi组碎屑岩为优质储集层,天然气有利聚集区呈北西—南东向展布,中部尤为有利。
Based on the well logging data of 10 gas wells in the El-Wastani gas field of the Nile Delta in Egypt, petrophysical analysis was performed on the Upper Miocene Qawasim and Abu Madi formations in the main reservoir of the gas field. Lithologic analysis was conducted using the cross-plot of log parameters Evaluate parameters such as shale content, porosity, water saturation, and pore volume of oil and gas. Analysis of each well’s neutron-porosity cross-plot, neutron-porosity-uranium gamma cross-plot and lithology-saturation crossplot showed that the lower Abu Madi Formation was mainly sandstone and even folder shale; the Qawasim Formation was mainly Page Rock, even folder sandstone. Using the parameters of cross-plot and uranium-free gamma ray logging results, the critical values of the parameters of effective production are as follows: 50% of clay content, 10% of porosity and 70% of water saturation. The contour maps of effective thickness, average porosity, shale content, water saturation and other parameters were drawn respectively. Comprehensive analysis showed that the clastic rocks in the Qawasim and Abu Madi groups are good reservoirs and natural gas is favorable The gathering area is northwest-south eastward and central especially favorable.