Petrophysical Modelling For the Bahariya Formation, Egypt

AbstractLithologic laminations have great consequences on the Bahariya sandstone, which are distinguished by the calculated reservoir statistical parameters. The non-laminated Bahariya studied samples have the lowest mean bulk density and specific internal surface values, while they have the highest mean porosity, permeability and Spor values. On the other hand, the laminated samples exhibit high values. The non-laminated Bahariya samples have the lowest mean permeability anisotropy, due to its relative pore-framework homogeneity. Contrary, the laminated Bahariya samples have the highest mean permeability anisotropy. By the same behaviour, the non-laminated Bahariya samples have the highest mean electrical resistivity value, due to the lack of conductive minerals, while the laminated Bahariya samples have the highest mean electrical resistivity.The non-laminated Bahariya samples show the lowest mean magnetic susceptibility value, while the laminated samples reveal high values. Sonic wave velocities (Vp and Vs) are statistically treated, while the velocity anisotropy is calculated for all samples. Laminated samples display higher velocity in comparable to the non-laminated ones. Thin sections and SEM-micrographs were made for some selected samples in order to recognize the Bahariya sandstone forming minerals. Glauconite, micas, zircon, rutile and pyrite minerals are composing the laminas in the laminated samples, while some glauconitic sandstone are predominant in the non-laminated ones.A number of linear regression models were performed among some measured petrophysical parameters, in order to differentiate between the laminated and the non-laminated sandstones, and to obtain reliable relationships permitting reservoir characterization

Petrophysical study of Szolnok Formation, Endrod gas field,

Results of both porosity and permeability can be used by geologists, petrophysicists, and petroleum engineers to evaluate reservoir rock, heterogeneity, and pore space history through the time of deposition and lithifaction. On the other hand, reservoir quality as well as reservoir classification could be performed based on these data correlation. The Szolnok Formation is composed mainly of turbidity elastic deposits while siltstones are intercalated by sandstone beds and streaks of marls. In the present study, 213 core samples are obtained from the Szolnok Formation of the Great Hungarian plain, Hungary. Both horizontal and vertical permeability are measured. The Szolnok Formation has two main lithologic groups: 1. clean sandstone (141 samples) and 2. siltstone – marl (72 samples), it can easily differentiate between good, intermediate or even bad reservoirs. Acoustic laboratory measurements have been carried out for only 30 sandstone rock samples parallel to the bedding plane (horizontal). This paper aims to evaluate some petrophysical relationships. On the other hand, both Wyllie and Raymer models were applied for porosity estimation from seismic velocity. It is worthy to mention that reservoir diagnosis of the Szolnok Formation was our target as well. Both the porosity and permeability variation range characterizing the detected lithologic facies of the Szolnok Formation are useful for reservoir zonation. The relationship between helium and mercury porosity for whole studied samples and sandstone samples as well, are supported by a high correlation coefficient and allow its application for prediction of porosity while it reduces costs and time of laboratory measurements. The evaluation of different calculated equations for porosity from compressional wave velocity data of the Szolnok Formation are studied and the relationship between velocity and porosity displays a clear inverse trend. The comparison between laboratory porosity and sonic derived porosity shows that the values determined by Wyllie and Raymer equations are not applicable to predict it from velocity data

تحديد الأنواع الأصلية لرواسب الدلتات الحاوية للهيدروكربونات باستخدام أشكال منحنيات التسجيلات : خزان ألجو - 2- المجر

Most of the deltaic sandstone reservoirs exhibit complex lithofacies as well as petrophysical variations in both time and space. Facies analysis and reconstruction of facies patterns for the Algyo-2 reservoir rocks encountered in fourty five bore-holes have been elucidated, using the log curve shapes. Vertical profiles of the log response against the studied intervals were categorized for three superimposed, deltaic rock types in most bore-holes. Thereupon, the defined vertical units were mapped to show their geographical distribution. This will throw light on both the location of the palaeoshoreline and the deltaic phase relationships. Also, the defined facies marker horizons reflect the orientation, geometry and palaeogeographic distribution of the Algyo-2 sandstone.تم التعرف على الأنواع الأصلية للرواسب الدلتائية في خزان ألجو - 2 وذلك في 45 بئرا محفوره بدراسة القطاع الرأسي لمنحنيات التسجيلات الكهربية والجهد الذاتي . وقد قسمت الأنواع الأصلية للرواسب الدلتائية إلى ثلاثة أطوار رسمت على خرائط لتوضح توزيعها الجغرافي القديم وامتدادات هذه الرواسب وكذا أشكالها الهندسية ، كما تلقي الضوء على أماكن خط الشاطئ القديم وعلاقته بالأطوار الدلتائية المذكورة

الخواص الكهربائية لصخور الأيوسين الأسفل في قطر

Thirteen limestone samples representing the Rus Formation (Lower Eocene) are selected' from four locations in Qatar Peninsula. These samples are subjected to electrical resistivity, porosity, shaliness factor and water saturation measurements. Very reliable formation resistivity factor—porosity relations have been obtained at two successive resistivity measuring cycles of rock samples saturated with two different brine concentrations. The limestones of the Rus Formation in each studied area are distinguished by a characteristic mean value of shaliness. A resistivity index—water saturation relation has been performed at the actual formation water resistivity.تم قياس المقاومة الكهربائية النوعية لعينات صخرية جمعت من متكون الرس التابع للإيوسين الأسفل في عدة أماكن في دولة قطر وذلك عندما كانت العينات مشبعة (100%) بمحلول كلوريد الصوديوم عند تركيزات مختلفة ومقاومة كهربائية =0.126 ، 0.054 أوم متر2/متر. وقد درست العلاقة بين معامل التكوين ومعامل مسامية الصخر عند كل تركيز ملحي وعولجت إحصائيا لتعين كل من معادلة الانحدار الخطي والثوابت المميزة لهذه الصخور والتي يمكن استخدامها في تفسير التسجيلات الكهربائية لهذه الصخور. ولقد استخدمت القياسات الكهربائية وكذلك قياسات المسامية في حساب كل من معامل الطفلة ومعامل التكوين الحقيقي (عند مقاومة كهربائية نوعيه للمحلول = 0.010 أوم متر2 /متر) للعينات قيد الدراسة . وأمكن باستخدام معامل الطفلة التمييز بين العينات التابعة لكل موقع موضع الدراسة . ولقد درست العلاقة بين دليل المقاومة الكهربائية ودرجة تشبع الصخور بمياه التكوين ، وتم تعيين الثوابت المميزة لهذه الصخور والتي تحدد مقدرتها على التشبع بالمياه . وتميزت هذه العلاقة بمعامل ارتباط عالي مما يتيح إمكانية استخدامها في حساب مقدار الاحتياطي المخزون من المياه الجوفية في متكون الرس في دولة قطر

بارامترات البنية لصخور الايوسين الأسفل في قطر

The study of some carbonate rock samples collected from four different locations in Qatar and attributed to the Rus Formation (Lower Eocene) reveals that these rocks are mainly heterogeneous in their petrophysical characteristics. This was indicated not only by study of pore space geometry but also by a skewed distribution of porosity, permeability, and hydraulic conductivity measured data. Parameters enhance reservoir evaluation and description were estimated. Whereas, useful empirical relations have been derived by which both the storage capacity and the gas—permeability of the studied rocks can be determined. Study of SEM-micrographs has shown the influence of post-depositional processes on both porosity and gas-permeability with different degrees of performance.تم قياس بعض البارامترات البتروفيزيائية مثل المسامية والنفاذية والتوصيل الهيدروليكي لعينات صخرية جمعت من متكون الرس التابع للإيوسين الأسفل في قطر . بمعالجة القياسات إحصائيا وصفت الصخور قيد الدراسة على أنها غير متجانسة الخصائص ، ولقد تم استنباط علاقات تجريبية بين حجم الفراغات البينية وكل من المسامية والنفاذية والتي تميزت بمعاملات ارتباط عالية مما يتيح إمكانية استخدامها في حساب كل من مقدرة الصخر على تخزين وتوصيل الموائع . وباستخدام الميكروسكوب الإلكتروني ودراسة الصور المجهرية للفراغات البينية تم تحديد الأسباب المحتملة لعدم تجانس كل من النفاذية والمسامية للصخور قيد الدراسة