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首页> 外文期刊>Bulletin of the National Research Centre >Petrophysical Facies Discrimination of Miocene Calcareous Sandstones, Wadi Feiran, Sinai, Egypt
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Petrophysical Facies Discrimination of Miocene Calcareous Sandstones, Wadi Feiran, Sinai, Egypt

机译：埃及西奈Wadi Feiran中新世钙质砂岩的岩石物理相判别

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摘要

Systematic petrophysical studies were carried out on some calcareous sandstone samples selected from Gebel Hadahid area, Wadi Feiran, south west Sinai,. The studied rock samples are belonging to the Lower Miocene (Rudeis Formation, 338.8 m) which conformably overlies the Nukhul Formation and unconformably underlies Quaternary gravels and sands. The Lower Miocene rocks of the studied area are composed mainly of sandstones intercalated with shale beds and few sandy limestone intercalations at the base. The studied samples were deposited in a fluviatile and mixed aeolian-fluviatile environment. The storage capacity of the studied rocks was diminished by cementation, mostly by calcite cementation, and rarely by hematite or silica cement. The collected samples were subjected to comprehensive systematic petrophysical investigations including measuring of the bulk density, the porosity, permeability, irreducible water saturation, electric tortuosity of channels, apparent electric resistivity of samples saturated with NaCl solution at three successive concentrations (6, 60 and 120 kppm), and the true electric resistivity. The petrophysical analysis enabled distinguishing three petrophysical facies. The lower and middle facies (lower and middle parts of Rudeis Formation) have good storage capacity properties due to their high porosity and permeability values, whereas the third facies (topmost parts of Rudeis Formation) has fair storage capacity properties.
机译：对选自西奈西南Wadi Feiran的Gebel Hadahid地区的一些钙质砂岩样品进行了系统岩石物理研究。所研究的岩石样品属于下中新世（Rudeis地层，338.8 m），其适形地覆盖在Nukhul地层之上，而相形之下则位于第四纪砾石和沙子之下。研究区的下中新统岩石主要由夹有页岩层的砂岩和底部的少量砂质灰岩夹层组成。所研究的样品沉积在易变的和风沙-易变的混合环境中。所研究的岩石的储藏能力由于胶结作用而降低，其中大部分由方解石胶结作用而降低，而赤铁矿或硅酸盐水泥则很少。对收集的样品进行全面的系统岩石物理研究，包括测量堆积密度，孔隙率，渗透率，不可还原的水饱和度，通道的曲折度，在三个连续浓度（6、60和120）下用NaCl溶液饱和的样品的表观电阻率kppm），以及真正的电阻率。岩石物理分析能够区分三个岩石物理相。下部相和中相（Rudeis组的下部和中部）由于具有较高的孔隙率和渗透率值，因此具有良好的储藏能力，而第三相（Rudeis组的最上部）具有合理的储藏能力。

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