Facies controls and tectonic evolution on oil accumulation and entrapment in the Cenomanian Abu Roash G member, northern-central Egypt: Deltaic and channel sandstones as good reservoirs
Mohamed Moustafa Afife , Maher El Ammawy , Muhammad Naguib El Ghamry , Adel Mady Afify
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引用次数: 0
Abstract
Along northern-central Egypt, the oil accumulation and entrapment were mainly controlled by variable parameters including the stratigraphic architecture, sedimentary features, and tectonic evolutions. The present paper presents a new model for oil occurrences in the Abu Roash G Member (Cenomanian) along Gindi, Abu Gharadig and to a few extents the Beni Suef basins, in the northern-central part of the Western and Eastern Deserts of Egypt. The studied concessions include the Wadi El Rayan, East Bahariya and El Diyur (Gindi basin and Abu Gharadig basins, Western Desert) and the Ghariboun (Beni Suef Basin, Eastern Desert) fields. Twenty sedimentary facies were recorded from the studied subsurface sections of the Abu Roash G Member and grouped into three facies associations. A new depositional model is achieved where estuarine, open marine, deltaic distributaries, and tidal channel deposits are the main facies associations recorded in the studied Abu Roash “G". These deltaic and channel deposits occurred as an arch like form between open marine and estuarine deposits. These deltaic and tidal channel sandstone deposits act as a good reservoir to accumulate oil from nearby areas. As well, these areas were subjected to the well-known Syrian arch compressional deformation that affected northern Egypt during the Mesozoic, up to late Senonian time. A regional NE-SW oriented fold system took place, forming NE-SW oriented ridges in addition to the dextral strike-slip movement that took place along these ridges because of this compressional deformation.
To sum up, oil accumulation in the studied Abu Roash G Member was mainly controlled by facies distribution mainly of channel sandstone enhanced by the tectonic movements (Syrian Arc System) affecting the areas studied.
埃及中北部塞诺曼系 Abu Roash G 组分石油积累和蕴藏的地貌控制与构造演化:作为良好储层的三角洲砂岩和河槽砂岩
在埃及中北部地区,石油的积累和封存主要受地层结构、沉积特征和构造演化等可变参数的控制。本文提出了埃及西部和东部沙漠中北部金迪、阿布-加拉迪格以及贝尼苏埃夫盆地少数地区阿布-罗阿什 G 组(仙人掌纪)石油分布的新模型。所研究的特许矿区包括 Wadi El Rayan、East Bahariya 和 El Diyur(金迪盆地和阿布加拉迪格盆地,西部沙漠)以及 Ghariboun(贝尼苏伊夫盆地,东部沙漠)油田。在研究的阿布-罗阿什 G 组地下断面中记录了 20 个沉积面,并将其分为三个面系。在研究的阿布鲁阿什 "G "岩层中,河口沉积、开阔海相沉积、三角洲分布沉积和潮汐河道沉积是主要的沉积面组合。这些三角洲和河道沉积以拱形形式出现在开阔海域和河口沉积之间。这些三角洲和潮汐通道砂岩沉积是一个很好的储油层,可以积聚来自附近地区的石油。此外,这些地区在中生代一直到晚元古代都受到了著名的叙利亚拱形压缩变形的影响。总之,所研究的 Abu Roash G 组的石油储量主要受控于主要为槽沟砂岩的岩相分布,而影响所研究地区的构造运动(叙利亚拱系统)又增强了这种岩相分布。
期刊介绍:
The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa.
The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.