The exposed Middle Eocene (Bartonian) Qurn Formation along Qattamiya—Ain Sokhna district is measured, sampled and microscopically investigated. Besides, the vertical distribution of the chemical oxides and strontium (Sr) has been determined to identify their petrographic, geochemical characteristics and interpret their depositional environments. The facies analysis (lithofacies, microfacies, and biofacies) of the studied rocks revealed the recognition of three microfacies associations: (1) restricted lagoon facies association (FT1–FT3), (2) open lagoon facies association (FT4–FT7), and (3) shoal facies association (FT8–FT9). Lithofacies and microfacies analysis of Middle Eocene rocks along Qattamiya—Ain Sokhna district reflect carbonate inner ramp regime ranging from restricted lagoon to shoal buildup depositional conditions. These identified inner ramp microfacies are changed eastward to mid-ramp, while they are represented westward by tidal flat and shallow lagoonal facies. The vertical distribution of both CaO and MgO revealed that MgO is related mainly to the dolomitization process rather than primary deposition. The vertical distribution of Sr in the studied carbonate samples matches with that of SiO_2, thus may be related to the warm environmental conditions.

对沿 Qattamiya-Ain Sokhna 地区暴露的中始新世（Bartonian）Qurn 组进行了测量、取样和显微镜研究。此外，还确定了化学氧化物和锶（Sr）的垂直分布，以识别它们的岩石学、地球化学特征并解释它们的沉积环境。研究岩石的相分析（岩相、微相和生物相）揭示了三种微相组合的识别：（1）限制性泻湖相组合（FT1-FT3），（2）开放泻湖相组合（FT4-FT7），和(3) 浅滩相组合(FT8-FT9)。Qattamiya-Ain Sokhna 地区中始新世岩石的岩相和微相分析反映了从限制性泻湖到浅滩堆积沉积条件的碳酸盐内斜坡状态。这些确定的内斜坡微相向东向中斜坡变化，而向西则以潮滩和浅泻湖相为代表。CaO和MgO的垂直分布表明MgO主要与白云石化过程有关，而不是与初级沉积有关。研究的碳酸盐样品中 Sr 的垂直分布与 SiO 的垂直分布相匹配_2，因此可能与温暖的环境条件有关。