Africa (Sub-Sahara) Eni successfully completed a new production well in the Vandumbu field, 350 km northwest of Luanda and 130 km west of Soyo, in the West Hub of Block 15/06 offshore Angola. The VAN-102 well is being produced through the N'Goma FPSO and achieved initial production of 13,000 BOED. Production from this well and another well in the Mpungi field will bring Block 15/06 output to 170,000 BOED. Anglo African Oil & Gas encountered oil at the TLP-103C well at its Tilapia license offshore the Republic of Congo. The well intersected the targeted Djeno horizon, and wireline logging confirmed the presence of a 12-m oil column in the Djeno. Total started production from the ultra-deepwater Egina field in approximately 1600 m of water 150 km off the coast of Nigeria. At plateau, the field will produce 200,000 B/D.
Seismic wave attenuation can be used to enhance geophysical interpretation in the reservoir zones, this has great benefit for oil and gas industry. Getting accurate attenuation profiles is prominent to get correct geophysical interpretation, however this is not an easy task since the methodology is not enough mature yet. The difficulty is higher for complex media like those composed carbonate rocks, such media are known to be highly heterogeneous. The subsurface of Abu Dhabi region is known to be mainly composed of carbonate rocks.
We developed a new method to estimate the intrinsic attenuation and scattering separately, from downgoing waves of VSP data. This new method is based on seismic interferometry technique and it is less sensitive to upgoing waves compared to classical methods. We estimated attenuation from sonic waveforms by using new method well adapted for such type of data, this method was successfully applied in previous studies.
We got accurate and high-resolution scattering and intrinsic attenuation profiles from five wells belonging to five oilfields located in Abu Dhabi region. Compared to previous studies carried out in siliciclastic media, the attenuation shows high variation over the depth, and the scattering shows significant contribution on the total attenuation. We explain this by the high heterogeneity characteristic of carbonate rocks.
We found very interesting correlation between the attenuation profiles and the other petrophysical logs, such as the sonic and oil saturation logs. The scattering shows a good correlation with the fractures, and intrinsic attenuation shows a good sensitivity to the fluid existence. So the combination between the scattering and the intrinsic attenuation is a promising and can be very useful for the petroleum exploration, especially in the case of Abu Dhabi reservoirs known to be highly fractured.
KOC and SGS performed a regional scale study to assess and forecast the H2S risk in the onshore sector of Kuwait. Based on KOC's comprehensive data base of H2S measurements, fluid chemistry, geochemical and lithological data, the H2S concentrations in the various hydrocarbon systems in Kuwait were mapped. The origin of the H2S in the Mesozoic reservoirs were analyzed and four major H2S systems were identified. The origin of the H2S in the Lower Jurassic is the TSR process with a pronounced regional trend of H2S concentrations increasing from 0.5% in the south up to 40% towards the north. The H2S encountered in the Upper Jurassic and Lower Cretaceous reservoirs originates from the cracking of sulfur in the Najmah source rock occurring during the early maturation process. The maximum H2S concentrations recorded in these systems does not exceed 5% and no regional trend of the concentrations is observed. The exceptions are overpressured carbonate stringers in the Upper Jurassic Gotnia and Hith formation which have local occurrences of more than 10% H2S. The Upper Cretaceous reservoirs in several oil fields show distinct H2S anomalies up to 5 %. Some of the anomalies possibly are related to field operation activities (e.g. injection) but also evidence for H2S migrated from deeper strata was found. Also indications for H2S scavenging in the Upper Cretaceous reservoirs was observed but could not be quantified. Some of the Tertiary heavy oil accumulations in the north which show high H2S concentrations could be related to the BSR process, however not all heavy oil reservoirs seem to be affected. A forecast of the future development of the H2S concentrations of each H2S system was performed.
The capacity for the storage of carbon dioxide in saline aquifers remains enormous. Of all geological storage media, it provides the best storage capacity. In this study, the potential of the Shuaiba Formation, in the Falaha syncline, for geologic sequestration is assessed. A regional geo-model was built using seismic and well data (logs, cores) from the Falaha Syncline and nearby fields. The model was built to honor the heterogeneity and sequence stratigraphy of the Shuaiba carbonate platform using a five-order hierarchical conceptual model of the Shuaiba formation that merged sequence architecture and reservoir architecture together. This was achieved by honoring lithofacies, facies association packages and rock types in their corresponding depositional settings in the sequence framework. Dynamic simulations were then conducted on an upscaled geological model using a compositional reservoir simulator to determine its storage and flow capacity, plume migration pathways and to understand the physics of the fluid flow in the aquifer. Simulations are made to be conservative thus accounting for structural/stratigraphic, solubility (dissolution in resident brine) and residual trapping without accounting for the slower mineral trapping process. Detailed sensitivity studies were conducted during the simulations to understand the effect of well parameters, rock and fluid properties amongst others on the storage capacity in the aquifer. Simulation results indicate that significant volumes could be stored in the aquifer and could take a significant amount of time before the injected gas reaches the surrounding hydrocarbon producing fields. This study provides the first full field approach to characterize and to quantify the suitability of the identified aquifer for long term storage of carbon dioxide in the subsurface of UAE.
Al Hosn Gas Executive Management saw the benefits of an integrated solution to managing Health, Safety and Environment (HSE) data aligned with the other Company business processes and using the same core data e.g. locations, terminology and key database tables to ensure a comprehensive strategy of centralised data management.
The new SAP Environmental, Health and Safety Management (EHSM) Modules are Incident Management, Risk Management, Waste Management, Environmental Compliance, Audit, Sustainability and Performance Measurement and Action Tracking.
Each ESHM module has an integral action tracker. Once entered actions are tracked and expedited automatically through the systems workflows (defined for each module on an activity by activity basis). The range of subject matter covered by the SAP EHSM modules surpasses the limitations of procuring individual specialist packages that do not share data without certain user manipulation. Within EHSM specific data can be downloaded to a variety of formats including Excel, Word, Pdf etc. and used in whatever software is required.
A substantial effort was dedicated to ensuring the system satisfied the requirements of the ADNOC CoPs and contained enhanced features. The system went live in 2015 and has been recognized throughout the company as a great success that’s adds considerable value to the organization.
Subsurface geological maps are perhaps the most important tool used to explore for undiscovered hydrocarbons and to develop proven hydrocarbon reserves. However, the subject of subsurface mapping is probably the least discussed in Abu Dhabi, yet most important, aspect of petroleum exploration and development. This paper presents the tectonic map for Abu Dhabi based on gravity, magnetic and seismic interpretations, along with describing the various elements, their controlling faults and their effect on basin development and also rationalizes previously published structural and tectonic elements to clarify the kinematic relations and naming of individual tectonic elements. The method, which combines geologic, geophysical data in a comprehensive way, incorporates these data to simulate the interrelated effects of deposition and erosion of sediments and compaction, pressure, petroleum generation and multiphase fluid flow. The tectonic map of Abu Dhabi distinguishes three principal tectonic cycles: (1) Precambrian cycles are interpreted using the magnetic data, as there are no wells that penetrated the basement in Abu Dhabi and the seismic is mostly covering up to Jurassic layers.
Increasing domestic energy consumption led Abu Dhabi to develop sour gas fields like the Shah gas field, which requires innovative technological solutions. For Abu Dhabi, research and development (R&D) provides an opportunity to facilitate the country’s transition from a hydrocarbon-based economy to a knowledge-based one and Abu Dhabi’s decision makers know that partnership and collaboration between companies and academia is key to R&D success. To enable that process, the government launched two major institutes for conducting research that emphasizes local energy issues—the Petroleum Institute University and Research Center in 2001, and the Abu Dhabi Future Energy Company (Masdar) in 2006. This was followed by the inauguration of the Takreer Research Centre with a focus on the refining sector in 2009. This article is reserved for SPE members and JPT subscribers.
Increasing domestic energy consumption led Abu Dhabi to develop sour gas fields like the Shah gas field, which requires innovative technological solutions. For Abu Dhabi, research and development (R&D) provides an opportunity to facilitate the country’s transition from a hydrocarbon-based economy to a knowledge-based one and Abu Dhabi’s decision makers know that partnership and collaboration between companies and academia is key to R&D success. To enable that process, the government launched two major institutes for conducting research that emphasizes local energy issues—the Petroleum Institute University and Research Center in 2001, and the Abu Dhabi Future Energy Company (Masdar) in 2006. This was followed by the inauguration of the Takreer Research Centre with a focus on the refining sector in 2009. Abu Dhabi National Oil Company (ADNOC) and its subsidiaries have launched a program to become a leader in R&D projects of local interest, such as CO2enhanced oil recovery (EOR), clean technologies, and a goal of a 70% enhanced recovery rate, which has not been achieved anywhere in the world, in addition to improving safety and efficiency.
Abdelghani Henni, JPT Middle East Editor For Abu Dhabi, research and development (R&D) provides an opportunity to facilitate the country's transition from a hydrocarbon-based economy to a knowledge-based one and Abu Dhabi's decision makers know that partnership and collaboration between companies and academia is key to R&D success. To enable that process, the government launched two major institutes for conducting research that emphasizes local energy issues--the Petroleum Institute University and Research Center in 2001, and the Abu Dhabi Future Energy Company (Masdar) in 2006. This was followed by the inauguration of the Takreer Research Centre with a focus on the refining sector in 2009. So far, ADNOC has created a new R&D department adopting a clearer definition of its goals and activities. In addition, the company sees 2015 as the year to reap the benefits from its ongoing R&D activities, despite the fall in oil prices.