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GEO 2012
- Conference date: 04 Mar 2012 - 07 Mar 2012
- Location: Manama, Bahrain
- Published: 04 March 2012
81 - 100 of 345 results
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Outcrop Analogs of the Oman Mountains Reveal Reservoir Potential in the Triassic Sudair and Jilh Formations (Middle & Upper Mahil, Sultanate of Oman)
Authors Michael Obermaier and Thomas AignerWhereas the Permian-Triassic Khuff formation is world famous for its hydrocarbon accumulations in the Middle East, the overlying Sudair and Jilh Formations are mostly top seal or baffle units. In contrast, outcrops in the Jabal Akhdar area of the Oman Mountains (where the Sudair and Jilh Formations are referred to as Middle and Upper Mahil members) consist mainly of dolomites with only occasional thin shale intercalations and reveal potential reservoir facies. While the Sudair is dominated by grainy carbonates of a subtidal shoal setting, the overlying Jilh indicates a restricted supratidal marsh to peritidal/lagoon environment.
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Sedimentary Models and Reservoir Architecture of Palaeozoic Glaciogenic Reservoirs: Learnings and Perspectives from the Study of Pleistocene Analogues
Glaciogenic sedimentary successions represent important exploration targets and developing reservoirs in the Paleozoic series both in the Middle East and in North Africa. However, these reservoirs pose a number of challenges primarily related to understand the sedimentary facies distribution hence the predictability of reservoir connectivity and properties.
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Frac'ing the Limits — How Application of Novel Tools and Techniques Helped Stimulate Arabia's Deepest Reservoirs
Authors Andreas Briner, Joe Curtino, Ghaith Hinai, Sultan Mahruqy, Latifa Qobi and Ray ArcherIn 2009 Petroleum Development Oman has started an ambitious deep and tight gas exploration programme exploring for previously untapped reservoirs. The exploration strategy is focusing on both conventional tight gas plays as well as deep unconventional gas resources.
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Stranded Oil - Re-discovering Forgotten Oil in Petroleum Development Oman
More LessPetroleum Development Oman (PDO) has been exploring in Oman for over 50 years and during this time the understanding of the petroleum systems in Oman has increased dramatically. PDO now develops a wide variety of fields including heavy oil and thin pay and is applying a number of EOR mechanisms in field re-developments. This has been made possible not just by our increased understanding, but also by technological advances and the infrastructure that has been built up over the years.
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Risking Stratigraphic Traps: The Need for Additional Risk Factors
More LessProbabilistic assessment of an exploration prospect includes estimation of the prospect’s chance of success, roughly the probability that the prospect will be a discovery. The process of estimating the chance of success is known as “risking.” Prospects are risked by considering the chance that each geologic element required for the accumulation of hydrocarbons is present or adequate. The individual elements are known as risk factors. Traditionally, two risk factors are used to assess the adequacy of the potential trap: structure and seal.
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Hydrocarbon Generation Modeling of the Basrah Oil Fields, Southern Iraq
Authors Thamer K. Al-Ameri, Mohammad S Jafar and Janet PitmanThis paper discusses source rock characterization and the results of one-dimensional petroleum-system modeling of the Upper Jurassic and Lower Cretaceous section underlying prolific Cretaceous and Tertiary reservoirs in oil fields in southern Iraq.
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Overview of 4-D Seismic Feasibility Studies in Oman
Authors Said S. Al-Busaidi and Yahya A. MaskariThe decline in oil production in the matured fields, coupled with the increase in demand for hydrocarbon and the rise of oil prices, drives oil companies to enhance oil production from existing fields. Petroleum Development of Oman (PDO) is currently deploying several different Enhance Oil Recovery (EOR) techniques such as steam/hot water injection, water flood, miscible gas injection and polymer.
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Integrated Reservoir Characterisation in Support of a Challenging Oil-Rim Development - Northern Oman
Authors David Alsop, Matthew Angelatos, Kenneth Newn and See Heng WongField scale reservoir characterisation of the Permo-Carboniferous, glacio-lacustrine Al Khlata Formation and the Permian shallow marine Lower Gharif Formation has been conducted in an attempt to identify mechanisms for unexpected production and drilling results including larger than predicted water-cuts. An interdisciplinary task-force was convened with the specific aim of integrating the depositional and structural framework with reservoir properties and production performance.
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Temperate versus Sub-Tropical Carbonate Reservoirs (Recent and Ancient Examples)
More LessRecent temperate carbonates consist mainly of bryomol or bryoforamol (in Tasmania,and South Australia and New Zealand). Carbonate sand is the dominant size fractions and cementation is very minor. skeletal fragments is dominated by calcite mineralogy.
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A Hybrid Wave Equation Datuming and Kirchhoff PSDM Solution for Accurate Onshore Seismic Imaging
Authors Leon L. Hu, Saleh Saleh, Krzysztof Sliz and Robert E. LeyIn the presence of complex structuring, wave equation migration (WEM) usually produces more accurate subsurface images than the ray-based methods, such as the Kirchhoff migration, but it is also computationally more expensive. Most onshore exploration targets in the Middle East are overlaid by complex geology in the near-surface. This complex near-surface remains one of the biggest challenges in onshore seismic data processing, and if it is not handled properly, poor imaging caused by wavefield distortion can mask the deeper targets.
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Azimuthal PSDM Residual Moveout Volume Scanning for Fracture Detection in a Structurally Complex Environment
Authors Krzysztof K. Sliz and Jianwu JiaoFractured rocks usually provide high permeability pathways for hydrocarbons. Unfortunately, fractures are difficult to image using seismic waves because they are below the typical seismic resolution. The majority of the prestack fracture detection methods, based on P-wave reflection data, use either amplitude variation with angle and azimuth or travel-time changes.
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Shaping the Wavelet
Authors Yuchun E. Wang and Shoudong HuoWavelets have been widely used in seismic data processing and interpretation for different purposes such as deconvolution, well ties and acoustic inversion, and data compression. Wavelet extraction methods roughly fall into two categories: statistical methods that use seismic data only, and deterministic (or semi-deterministic) methods in which well log data is utilized. We propose a new deterministic technique that may be more stable and offers better results than the traditional wavelet extraction methods currently being used.
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A Case Study of Structural Prospect Validation Using Turning Ray Tomography
Authors Robert E. Ley, Joseph McNeely, Adnan Bagshi and Darren BuickThe area presented in this case study is located in the Eastern Province of the Kingdom of Saudi Arabia. Karst features within the area contribute to a complex near surface with sinkholes and partially dissolved layers.
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Fluvial and Fluvio-Deltaic Reservoirs of the Upper Carboniferous of NW Europe
Production efficiency from deep Carboniferous gas reservoir is largely controlled by understanding reservoir properties distribution and sand connectivity in a relative low net:gross environment. After more than 50 years of production, this play still mature represents a key target for further exploration and near field appraisal.
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Age, Correlation, Depositional Environments, and Sedimentary History of the Fat’ha Formation (Burdigalian, Lower Miocene) of Iraq
Authors George J. Grabowski and Chengjie LiuThe Fat’ha Formation is a heterolithic unit of evaporites, carbonates, and fine-grained siliciclastics that is the topseal for the Kirkuk Group. It is equivalent to the Lower Fars Formation in Syria and the Gachsaran Formation in Iran. It is thickest in the Zagros Foldbelt and adjacent eastern parts of the Mesopotamian Basin and thin to the SW.
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Multiple Layer Modeling of the Near-Surface to Calculate Static Corrections
Authors Ralph M. Bridle and Abdulaziz Al-SaadBuilding of a multiple layer model starts with the interpretation of uphole survey. Based on these interpretations an initial model is built for each 2D line. After gridding of these 2D velocity models, a contour map of the average velocity is created. Given the thickness from surface to datum, the static correction for any X/Y location within the map is calculated.
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Unravelling the Complexities of the Western Deformation Zone in South Oman: An Integrated Geophysical Study
Authors Bill Wilks, Tim Johnson, Wafa Salmi, Talal Busaidi and James McilroyThe Ara stringers of the South Oman Salt Basin (SOSB) have long been a key exploration target for Petroleum Development Oman (PDO). Within the main body of the salt basin external tectonic forces have exerted a relatively subtle influence on early basin development, such that deep-rooted high relief traps are rare. Towards the west, however, all things change.
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Geological Controls on Waterflood Performance, an Example from a Field in South Oman
Authors Andrew Faulkner, Mohammed R. Shaikh, Yousuf Busaid and Mohamed AfifiThe AB field located in south Oman is a north south elongate feature consisting of four structural crests and produces from the Permo-Carboniferous Al Khlata and Gharif Formations and Mesozoic Clastics. The Gharif formation is currently under waterflood development.
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Thermal Maturity of Source and Reservoirs Rocks and Crude Oils of Bangestan and Khami Reservoirs of Dezful Embayment in Marun Oil Field, Iran
Authors Elham Asadi Mehmandosti and Mohammad H. AdabiMarun oil field (asymmetrical anticline with a general trend of NW to SE) is one of the main oil fields in Dezful Embayment area, Zagros, Iran, which is studied geochemically in this research. Twenty three extracted rock samples from different source and reservoir formations (Cretaceous-Tertiary in age, Garau, Gadvan, Dariyan, Kazhdumi, Sarvak, Gurpi and Pabdeh formations) and 6 crude oils from Bangestan and Khami reservoir were studied for organic geochemistry and biomarker investigation.
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Investigation of Key Jurassic Unconformity and Hiatus Signatures in Saudi Arabia Using Seismic Chronostratigraphy and Wheeler Techniques
The Jurassic period worldwide is defined by regional sea-level changes punctuated by major transgressions and regressions. These events have created major stratigraphic sequences throughout the world and resulted in the deposition of key reservoirs, source rocks, and seals throughout this stratigraphic interval. On the Arabian Platform, the Jurassic sequences are prolific and contain significant oil and gas accumulations. Additional hydrocarbon potential may exist based on a more detailed understanding of the stratigraphic gaps/hiatus events, and their impact on the redistribution of reservoir rocks, the maturation of the source rocks and the hydrocarbon migration.
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