Case History - The First S4 Survey in Abu Dhabi

Marmash, Samer; Jeelani, Omar Sultan Al; Jenaibi, Mahfoud Sai Al; Haggag, Ismail; Morrison, David Alexander; Glushchenko, A.

doi:10.2118/171818-ms

Cited by 3 publications

(1 citation statement)

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“…When a seismic survey is designed for deep targets, e.g., a few kilometers, the imaging of the near surface can be a challenge (see, e.g., Pecholcs et al, 2002 andVesnaver, 2004, among others). Single-source single-sensor surveys, also known as dense, wide aperture surveys, have been successfully used for many highresolution studies of active faults and volcanic areas (e.g., Operto et al, 2004, Improta and Bruno, 2007, Bruno and Castiello, 2009, and Bruno et al, 2013, but only recently this field technique has been validated for large-scale 2D and 3D surveys (El-Emam and Khalil, 2012;Marmash et al, 2014;Granser et al, 2015). This recording geometry is appropriate for the tomographic imaging of direct and diving waves, provided that the local resolution of the Earth model to be inverted is consistent with the wavelength of recorded seismic waves (see, e.g., Berkhout, 1984 andBöhm, 1997, among others).…”

Section: Introductionmentioning

confidence: 99%

Groundwater characterization in arid regions using seismic and gravity attributes: Al Jaww Plain, UAE

Bruno

Vesnaver

2021

Front. Earth Sci.

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This paper discusses a multivariate approach aimed at geophysical characterization of subsurface rocks for groundwater exploration in arid environments. We integrate several findings obtained from a single-source, single-sensor seismic profile with gravity data to detail the tectonic settings and characterize the subsurface, water-bearing formations of the Al Jaww Plain, one of the most important groundwater reserves of the United Arab Emirates. The seismic data have been acquired in the framework of the first EAGE Middle-East Bootcamp. Edge-detection techniques applied to the Bouguer anomaly map of the Al Jaww Plain allowed us to infer the presence of unreported ENE trending tectonic lineaments. The prestack depth migrated seismic image shows a clear and previously unreported east-verging thrust affecting seismic wave propagation and consistent with gravity data which was interpreted as an evidence of a detachment fold and thrust above the bottom of Fiqa Formation. Using the first-arrival picking from the common shot gathers, we tested a coupled tomographic inversion of P-wave velocity and Q factor which was aimed at achieving a qualitative characterization of rock petrophysical properties. K-means clustering was used to classify and map subsurface areas characterized by similar observations of P- and Q-wave velocity and therefore to outline shallow zones (<600 m) that are consistent with geophysical properties which are typical for water accumulations and within the reach of water groundwater exploration.

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Section: Introductionmentioning

confidence: 99%

Groundwater characterization in arid regions using seismic and gravity attributes: Al Jaww Plain, UAE

Bruno

Vesnaver

2021

Front. Earth Sci.

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Recent 4S High Fold 3D Seismic Acquisitions in the Abu Dhabi Foreland of the Oman Mountains

Granser¹,

Novotny²,

Fava

et al. 2015

Day 1 Mon, November 09, 2015

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OMV and ADNOC commissioned WesternGeco to acquire a high fold, high density seismic program in the Foreland of the Oman Mountains, west of the city Al Ain. The objective of the survey was to acquire high quality 3D seismic data for a proper delineation and reservoir characterisation of structural and stratigraphic trapping geometries in order to identify potential exploration drilling locations. The acquisition commenced Mid-2014 and was completed by early 2015. The program included two separate 3D areas covering 1800km². In addition, 700km of infill 2D lines were recorded to connect the two 3D surveys with modern 2D seismic and to complement the existing vintage 2D seismic grid. The seismic surveys were recorded with a Single Source Single Sensor design (4S) using WesternGeco's UniQ seismic acquisition system with single sensor geophone accelerometers (GACs) and single 80,000lb DX-80 vibrators. A Maximum Displacement Sweep was designed to enhance especially low frequencies resulting in a broadened amplitude spectrum. Operating up to 15 vibrators simultaneously allowed a very efficient seismic data acquisition but needed the implementation of the correct separations and slip times to ensure the data was not contaminated. The 18sec custom designed broad bandwidth sweep (1–120Hz) enhanced the S/N ratio in general and improved the data quality of the deeper target levels due to the input of low frequencies (below 10 Hz). Sufficient azimuth, high fold, long offsets, broad bandwidth as well as optimum random noise reduction and increased spatial resolution was required to improve data quality. Therefore gaining more value with advanced seismic attribute analysis and enhancing the illumination of deeper zones in order to meet the objectives of the seismic. On the logistical side, high flexibility was needed to allow complex and dynamic fleet grouping to maximize productivity. Any cross-talk noise between two different sources was managed using Managed Source and Spread (MSS) time and distance rules, which were based on the target characteristics. Acquiring dense 4S seismic required detailed planning to ensure operational safety and to achieve the planned fold coverage, especially in areas of dense infrastructure. The processing sequence for the high fold, high density 4S pre-stack seismic totalling 160 TB of data – 16 billion traces, was designed to effectively remove noise and preserve signal fidelity in the pre-stack data to ensure an optimal imaging and resolution of the geological targets. Due to the dune environment in the area, the application of optimal static solutions was an essential processing step. The good sampling of the noise in the raw data by the high density and high fold acquisition enabled a successful noise suppression performance and resulted in improving the image of the geological signal.

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Broadband Surveys Conducted in Abu Dhabi, UAE

Ofowena¹,

Glushchenko²

2015

Proceedings

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SUMMARYAbu Dhabi Company for Onshore Petroleum Operations LTD. (ADCO) has acquired and managed several broadband Single Sensor Single Source surveys in the Emirate of Abu Dhabi over the last two years. The survey objectives have varied from exploration to field development, so whilst some of the acquisition parameters has changed, the fundamentals required to record a broadband survey has been maintained regardless of the target. The key elements of acquiring a broadband survey are low frequency enhanced sweep, sweeping to a frequency above what has previously proved recoverable, effective noise attenuation to obtain good signal to noise across the full sweep bandwidth and a detailed and accurate near surface velocity model.

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Case History - The First S4 Survey in Abu Dhabi

Cited by 3 publications

References 1 publication

Groundwater characterization in arid regions using seismic and gravity attributes: Al Jaww Plain, UAE

Groundwater characterization in arid regions using seismic and gravity attributes: Al Jaww Plain, UAE

Recent 4S High Fold 3D Seismic Acquisitions in the Abu Dhabi Foreland of the Oman Mountains

Broadband Surveys Conducted in Abu Dhabi, UAE

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