Multimeasurement streamer acquisition for reservoir development – A case study from offshore West Africa

Cunnell, Chris; McHugo, Stephen; Joyce, S.; Bennett, Phillip R.; Furber, A.

doi:10.1190/segam2014-1198.1

SEG Technical Program Expanded Abstracts 2014 2014

DOI: 10.1190/segam2014-1198.1

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Multimeasurement streamer acquisition for reservoir development – A case study from offshore West Africa

Chris Cunnell¹,

Stephen McHugo

S. Joyce

et al.

Abstract: A towed-streamer seismic survey was acquired offshore West Africa using a multimeasurement acquisition system. The objective of the new 3D seismic survey was to acquire high-quality, high-resolution 3D seismic data to improve confidence in siting appraisal and development wells above that given by existing legacy 2D data. Analysis and preliminary interpretation of the processed data volumes show that the data set achieved the characteristics of broadband seismic data required for detailed structural and strati… Show more

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2015

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High Quality and Efficient Seismic Acquisition for Frontier Deepwater Areas

et al. 2015

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The trend towards frontier deepwater (FDW) exploration plays around the world creates new challenges for seismic data acquisition, processing and interpretation. Technical challenges focus on the need for high-quality seismic data to allow good understanding of geology from seafloor to target -so as well as providing an image of the drilling targets, the seismic survey is must deliver reliable information about the overburden to mitigate drilling surprises. In addition, economic challenges reflect the need to acquire data over large areas in a cost-effective manner, but without compromising data quality. This paper reviews a new class of marine seismic technology that aims to address these previously contradictory demands. The technology is based on multimeasurement streamers that combine traditional hydrophone (pressure) measurements of the seismic wavefield with densely spaced accelerometer measurements that derive the wavefield gradient in vertical and horizontal directions. These measurements are combined to perform dense seismic wavefield reconstruction. The results provide greater detail of the seismic wavefield between the streamers and build a true 3D representation of the seismic wavefield that is equally and finely sampled in all directions.In the context of FDW exploration, this offers two main benefits. The first relates to the ability to generate high-resolution earth models of the overburden, where fine-scale isometric subsurface characterization can help define safe and efficient well trajectories. This offers protection against noise and other artefacts in the seismic data, which, despite the typical characteristics of ultra-deepwater environments, may otherwise introduce interpretational uncertainty. It also mitigates inaccuracies and bias in the shallow velocity model impacting the deeper earth model construction.Secondly, the ability to accurately reconstruct the seismic wavefield between streamers presents options for acquiring data faster, more cost effectively, and with less operational and environmental exposure. For example, using two-and three-boat operations to double or triple subsurface coverage with a single recording vessel. A selection of examples using real and modelled data will be used to illustrate both these key aspects.Successful seismic imaging for FDW means understanding the pathway to the target reservoir as much as the target itself. A broad technology portfolio is required to provide integrated workflows, and multimeasurement seismic acquisition can be a key component in the solution; addressing aspects of enhanced resolution, wavefield sampling, and 3D deghosting, whilst also providing options to acquire data more efficiently without compromising quality.

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High Quality and Efficient Seismic Acquisition for Frontier Deepwater Areas

et al. 2015

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Multimeasurement streamer acquisition for reservoir development – A case study from offshore West Africa

Cited by 1 publication

References 5 publications

High Quality and Efficient Seismic Acquisition for Frontier Deepwater Areas

High Quality and Efficient Seismic Acquisition for Frontier Deepwater Areas

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