Characterisation and Modeling of Fractures in Large Onshore Abu Dhabi Carbonate Field

Sirat, Manhal; Al-Dayyani, Taha; Singh, Maniesh; Rehman, Abdul; Al-Zaabi, Naema; Mahmoud, Sabry Lotfy; Shuaib, Mohamed; Moge, M.

doi:10.2118/162342-ms

Cited by 8 publications

(2 citation statements)

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“…Interestingly, the NW-SE Profile 3 does not image any faults. This is because the seismic Profiles 3 and 11 (Figs 6 and 9) are parallel to the major N75˚W and N45˚W faults imaged in the Asab anticline (Sirat, 2015;Sirat et al, 2012b).…”

Section: Asab Anticlinementioning

confidence: 97%

“…However in general, fault density and throw appear to increase near fold axes, in particular in the Asab and Sahil anticlines, suggesting that folding and faulting may be coeval (Johnson et al, 2005). However, Sirat et al (2012aSirat et al ( , 2012bSirat et al ( , 2013 and Sirat (2015) suggested that the N75˚W faults are pre-folding and formed as tensile fractures when the maximum horizontal stress was oriented at 120˚ during the Early Cretaceous; whereas the N45˚W are post-folding and formed as splays from N75˚W faults when the maximum horizontal stress was oriented east-west. The northward movement of the Indian plate and obduction of the Masirah Ophiolite during the Maastrichtian -Paleocene is inferred to have caused counter-clockwise rotation of the maximum horizontal stress axis, which resulted in the development of the N75˚W faults (Sirat, 2015).…”

Section: Timing and Growth Of Faulting And Foldingmentioning

confidence: 97%

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Cretaceous – Neogene Structural Evolution of Se Abu Dhabi, United Arab Emirates

Ali

Farid

2016

Journal of Petroleum Geology

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Section: Asab Anticlinementioning

confidence: 97%

Section: Timing and Growth Of Faulting And Foldingmentioning

confidence: 97%

Cretaceous – Neogene Structural Evolution of Se Abu Dhabi, United Arab Emirates

Ali

Farid

2016

Journal of Petroleum Geology

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Fracture Characterization of a Carbonate Reservoir by DFN Modeling: A Case Study

Türkmen¹,

Gozel²

2014

SPE Annual Technical Conference and Exhibition

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One of the main challenges in development of the fractured reservoirs is the identification of "sweet spots" which are the most intensely fractured areas of a field, maintaining a long term production with minimized risks in drilling. This paper presents a multi-disciplinary approach including G&G (geology & geophysics), petrophysics and reservoir engineering perspective to overcome this difficulty in a particular oil reservoir by defining the fracture systems that mainly contributes to the hydrocarbon storage capacity and flow dynamics.Şambayat Field is one of the most important naturally fractured carbonate reservoirs located in the Southeast Turkey. Reservoir zones in the field include a number of reverse, synthetic and antithetic faults and related fracture sets which are hydraulically in contact with each other. In this context, characterizing the fracture network becomes the most critical issue in the analysis of production and the development strategy of the field.For this purpose; besides the conventional open-hole log analyses, image log interpretations have also been performed in order to evaluate the properties of the fractures. To honor these interpretations; dynamic (drill stem test & production) and static (outcrop & core) data have been evaluated together. Distributions of the petrophysical properties and the fractures have been done by using stochastic methods in full-field scale. At the end of the modeling study, a dual porosity geological model has been generated by using the Discrete Fracture Network (DFN) approach with respect to the estimated fracture characteristics.As the result of the previous characterization study, new well locations and their optimized orientations had been determined and the results coincided with the expected types of fractures estimated in the DFN model. After updating the model with the new well data and the enhanced functionalities in the modeling software, additional well locations have been proposed which will play a role in one step further of the study; simulation.This study has contributed to our knowledge about the characteristics of a naturally fractured carbonate reservoir which is similar to the ones explored in Southeast Turkey and to some extend in Middle East. It should also be noted that, our approach in this particular study is a newly developing technique and could be used for the promising "previously overlooked" unconventional reservoirs.

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Detection of Bedding Corridors From Open-hole Logs in Vertical Wells and Their Impact on Geomechanical Assessment

Sirat

Noufal

2015

Day 2 Tue, September 15, 2015

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Bedding corridors are sub-horizontal tabular bodies of bedding plane weak zones formed as shear swarms, which vertically divide the entire reservoir thickness and extend laterally as their layers. Bedding corridors are genetically related to shearing along the bedding planes and they contribute to the conductive systems in few Abu Dhabi reservoirs. They can be best identified from horizontal borehole image logs, and as spikes in open-hole logs. Natural bedding corridors can be considered as indicators of the reservoir stress history, where they form extraordinary clusters of a huge number of quasi-parallel shear fractures in a transpressional regime.In many oil and gas reservoirs, natural bedding corridors networks help drain hydrocarbons and other fluids. The role of bedding corridors is particularly important in reservoirs having a tight matrix. In carbonate formations, for example, it is quite common to observe a permeability contrast of 1000mD or more between the rock matrix and surrounding bedding corridors. In this paper we differentiate between image-log porosity and density-neutron porosity, which is regarded as secondary porosity attributable to fractures. We also introduce here a working hypothesis about their effect on hydrofraccing being part of geomechanical assessment.Results indicate that the horizontal stress anisotropy (Shmin/SHmax ratio) is the key parameter to predict bedding corridors behavior under different stress regimes. Swapping stresses with depth is common in Abu Dhabi fields, where a strike-slip regime can open and dilate the shear along the bedding planes. It is recommended to opt for horizontal wells hydrofraccing to maximize the intersection of those bedding corridors compared to vertical wells.The significance of this approach is that once a diagnostic signature can be recognized in open-hole logs, in combination with lost circulation data, it can be used to locate bedding corridors in other vertical wells with no image logs. Geomechanically, these corridors can be used efficiently to increase production particularly in tight and unconventional reservoirs.

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Characterisation and Modeling of Fractures in Large Onshore Abu Dhabi Carbonate Field

Cited by 8 publications

References 0 publications

Cretaceous – Neogene Structural Evolution of Se Abu Dhabi, United Arab Emirates

Cretaceous – Neogene Structural Evolution of Se Abu Dhabi, United Arab Emirates

Fracture Characterization of a Carbonate Reservoir by DFN Modeling: A Case Study

Detection of Bedding Corridors From Open-hole Logs in Vertical Wells and Their Impact on Geomechanical Assessment

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