Delineating the main structural outlines and the petrophysical properties of the Albian-upper Cretaceous Reservoirs using seismic and well log data, Shushan Basin, north Western Desert, Egypt

Dally, Nancy H. El; Youssef, M. S. K.; Aal, Mohamed H. Abdel; Metwalli, Farouk I.; Nabawy, Bassem S.

doi:10.1007/s13202-022-01603-0

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…The minimum value of water saturation in Lower Bahariya Formation is 0.33 in well Khalda-49 and the maximum value is 0.91 in well Khalda-53 giving an average of 0.55. In the current study the Neutron-Density, M-N cross plots and Litho-saturation cross plots of Khalda wells Fig.s (13,14,15,16) reveal that Bahariya Formation consists of shale, siltstone, limestone and sandstone streaks. The pore spaces of the sandstone are filled with water, residual and movable hydrocarbons.…”

Section: Sw = (Arw) ∕ (2 ø M ) {Sqrt[(vsh ∕ Rsh)2+ ((4 * ø M ) ∕ (Arw...supporting

confidence: 48%

“…3: Base map of seismic lines and wells in the study area.The reservoir model of Bahariya reservoirs is used to represent the shape of the structures, the workflow used to model the Bahariya reservoirs in the Khalda field consisted of three types of modelling based on the interpretation of the seismic and well logs. The evaluation of the hydrocarbon potentiality of the Shushan Basin and Khalda oil field are investigated in recent studies[14,15,16].…”

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3D Static Reservoir Modeling of the Bahariya Reservoirs in parts of the Shushan Basin, North Western Desert, Egypt

Metwalli

Othman

Fathi

et al. 2023

Advances in Basic and Applied Sciences

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The Khalda Oil Field is one of the most productive in the Shushan basin; two dry wells were recently drilled in the study area's northern and southwest corners. The primary goal of this study is to assess the potential of the Bahariya reservoir in the Khalda Oil field and to express the geological, petrophysical, and structural features through maps and cross sections. The Upper and Lower Bahariya members were evaluated as hydrocarbon-bearing sandstone reservoirs using a complete set of well logs from eight wells and thirty 2D seismic lines. The NW-SE fault trend is clearly defined by the interpretation of the depth structure contour maps. The quantitative computerprocessed interpretation of petrophysical characteristics such as lithology, net pay, effective porosity (eff), the volume of shale (Vsh), water saturation (Sw), and hydrocarbon saturation (Sh) is obtained. All of these findings are represented in a 3D geological model. 3D static reservoir modelling of the Bahariya reservoirs using seismic and well data can be an important part of an overall strategy for oilfield development and locating a new drilling location. A 3D integrated reservoir model was run on eight wells to simulate the subsurface structural setting, petrophysical modelling, and facies distribution modelling of the Cretaceous Bahariya reservoir, which is the study's main oil-bearing reservoir. In the Late Albian (Lower Bahariya), Early Cenomanian, the various structural depth maps and structural cross-sections extracted from the 3D structural model show 11 dip-faults that are primarily normal faults with dominated NW-SE trends (Upper Bahariya), Facies and petrophysical cross-sections extracted from the 3D model show the lateral extension of these properties and their thickness variation through the reservoir zones. The combination of geological structures, accurate facies, and petrophysical evaluation provides an excellent framework for planning appropriate drilling campaigns for Khalda oil field exploration and development.

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Section: Sw = (Arw) ∕ (2 ø M ) {Sqrt[(vsh ∕ Rsh)2+ ((4 * ø M ) ∕ (Arw...supporting

confidence: 48%

mentioning

confidence: 99%

3D Static Reservoir Modeling of the Bahariya Reservoirs in parts of the Shushan Basin, North Western Desert, Egypt

Metwalli

Othman

Fathi

et al. 2023

Advances in Basic and Applied Sciences

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Cohesive approach for determining porosity and P-impedance in carbonate rocks using seismic attributes and inversion analysis

Bashir,

Siddiqui,

Morib

et al. 2024

J Petrol Explor Prod Technol

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The assessment of hydrocarbon flow through seismic and well-log data presents a persistent challenge in determining porosity. The acoustic impedance section provides a visual representation of the layers, while the raw seismic data showcase the subsurface reflectors that exist within the rock layers. The accuracy of acoustic impedance is widely acknowledged to surpass that of seismic data as a representation of reality. The primary objective of this study is to convert seismic reflector data into acoustic impedance values, which provide insights into the layer properties based on lithology. This approach enhances the accuracy of seismic inversion results by aligning them more closely with actual geological conditions. Seismic inversion is employed to ascertain the physical characteristics of the rock, including acoustic impedance and porosity. Carbonate reservoirs are recognised for their complex pore structures and heterogeneity, which present difficulties in their characterisation. The objective of this research is to predict the porosity and identify the reservoir within the dense carbonate reservoirs in Central Luconia, Sarawak. These objectives are achieved by employing a porosity and acoustic impedance cross-plot and improved precision and predictability through the integration of seismic attribute interpretation and deterministic seismic inversions. The uniqueness of our approach stems from the incorporation of various geophysical techniques to detect reservoirs that have hydrocarbon deposits. A correlation is observed between seismic inversion acoustic impedance and porosity within the zone of interest, indicating an estimated porosity range of 10–35%. The analysed area demonstrates the possibility of containing a hydrocarbon based on the observed relationship between porosity and impedance, as well as the outcomes of the inversion analysis.

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Seismic interpretation and sequence stratigraphic analysis of the Bahariya Formation in the South Umbaraka oilfields (Western Desert, Egypt): insights into reservoir distribution, architecture, and evaluation

Shehata,

Abdel-Fattah,

Hamdan

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The integration of multiscale datasets, including seismic, well-logs and stratigraphy, is providing a precise picture about reservoir evaluation and spatial distribution. This study focuses on the seismic interpretation and sequence stratigraphic analysis of the Bahariya Formation in the South Umbaraka oilfields (Selkit, Khepri, and Sethos), located in the Western Desert of Egypt. Seismic interpretations reveal various structural closures, including anticlinal domes and faulted anticlines in different fields. The study area is divided into northern and southern blocks separated by a major fault, and structural cross sections provide valuable information on reservoir zones regarding lateral extension, thickness variation, and fault distribution. The Bahariya Formation is subdivided into two depositional sequences: Lower Bahariya sequence (BAH.SQ-1) and Upper Bahariya sequence (BAH.SQ-2) with distinct wireline-log characteristics, seismic reflections, and lithofacies variations. BAH.SQ-1 comprises mixed siliciclastic-dominated units with some carbonate units, while BAH.SQ-2 consists of mixed siliciclastic and carbonate units. Multiple sequence boundaries, depositional surfaces, and systems tracts are identified within BAH.SQ-1 and BAH.SQ-2, indicating changes in sedimentary environments and sea-level fluctuations. The petrophysical evaluation reveals promising reservoir zones in both the Lower and Upper Bahariya sequences. However, the Lower Bahariya sequence exhibits superior reservoir characteristics in terms of net-pay thickness, shale volume, effective porosity, and water saturation. Particularly, the sandstone-dominated LST-1 within the Lower Bahariya Formation is identified as a favorable reservoir zone. Conversely, the Upper Bahariya Formation has limited reservoir potential. This study underscores the significance of sequence stratigraphy and reservoir architecture, emphasizing the role of faulting, folding, and depositional environments in the distribution and quality of reservoir zones. The findings contribute valuable insights into the structural and stratigraphic characteristics of the Bahariya Formation, enhancing understanding of hydrocarbon plays and reservoir distribution in the studied area.

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Delineating the main structural outlines and the petrophysical properties of the Albian-upper Cretaceous Reservoirs using seismic and well log data, Shushan Basin, north Western Desert, Egypt

Cited by 8 publications

References 32 publications

3D Static Reservoir Modeling of the Bahariya Reservoirs in parts of the Shushan Basin, North Western Desert, Egypt

3D Static Reservoir Modeling of the Bahariya Reservoirs in parts of the Shushan Basin, North Western Desert, Egypt

Cohesive approach for determining porosity and P-impedance in carbonate rocks using seismic attributes and inversion analysis

Seismic interpretation and sequence stratigraphic analysis of the Bahariya Formation in the South Umbaraka oilfields (Western Desert, Egypt): insights into reservoir distribution, architecture, and evaluation

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