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- Volume 36, Issue 9, 2018
First Break - Volume 36, Issue 9, 2018
Volume 36, Issue 9, 2018
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Improved prospect evaluation and drilling results in the Dutch North Sea with diffraction imaging
Authors David Bréthaut, Bob Hartstra, Makky Jaya, Tijmen Jan Moser, Guus van Noort and Michael PelissierAbstractWe present an integrated interpretation case study of pre-stack depth migration and diffraction imaging in two Dutch North Sea gas fields. Diffraction imaging, as the detector of discontinuities at very high resolution and unlimited by illumination constraints, is the ideal technique for mapping gas accumulations at fault cuts (DI as DHI). The diffraction image, being a migrated physical wavefield, has amplitude, frequency, phase, polarity and tuning properties which can all be used to enhance its interpretation value. We use the diffraction imaging response of elementary models to build up an edge diffraction calculus and thus model and predict responses from more complex structures. This confirms the details seen in the diffraction images and well data from the studied gas fields. Diffraction imaging allows for a significant refinement of the interpretation resulting in more accurate definition of drilling targets and lower uncertainty in resource volumes.
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VSP measurements used as a tool for improving seismic sub-salt imaging in brownfield development
Authors Thomas Bartels, Manuel Gelhaus and Mary HumphriesAbstractMany of the Paleozoic Rotliegend low-permeability dry gas fields in the Southern Permian Basin of northern Germany are covered by Mesozoic salt dome structures. The resulting complexity in the overburden leads to imaging problems in subsalt reservoirs typically situated at depths between 4000 m to 5000 m TVD. Since structural compartmentalization is often the key challenge in field development, good resolution seismic is essential for well planning. For the study area, only a vintage 3D seismic survey from 1993/94 with limited data quality exists. Acquisition of new 3D seismic data is not possible owing to permitting restrictions and public resistance. Therefore the focus is on the acquisition of 2D VSPs in every new drilled well. The VSP measurements give local insights into the reservoir in the vicinity of the wellbore. With a general structural understanding and production history in mind, those local insights generate immense value for the understanding of the field.
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Stochastic inversion of seismic data by implementing image-quilting to build a lithofacies model for reservoir characterization of Delhi Field, Louisiana
Authors Mitra Azizian and Thomas L. DavisAbstractConsidering the depositional and geological complexity present in the fluvial deltaic systems, such as Delhi Field, Louisiana, application of conventional geostatistics for reservoir modelling or conventional seismic inversion approaches will not obtain a detailed and accurate lithofacies and rock property model for the field. Therefore, incorporation of advanced geostatistical approaches that can capture the complex depositional features of the reservoir is of great importance.
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Shallow water 3D in South Gabon: a new generation of hydrocarbon prospects
Authors Paolo Esestime, David Eastwell, Karyna Rodriguez and Neil HodgsonAbstractGlobal exploration has seen a dramatic upturn in 2018, with close to 4 billion barrels of oil equivalent discovered in the first half of the year alone, and many exciting wildcat wells still to come. Although the oil price slide of 2014 changed the industry, with the focus now on commerciality and risk reduction, it is of interest that most of the new discoveries this year have been made in commercially challenging deep water. The reason for this is that our industry has been exploring shallow-water oil-prone basins since the invention of marine seismic methods in the 1950s, and they appear now to be ‘mature’ and depleted in material low-risk opportunities. Indeed the future of shallow-water exploration has been portrayed as binary: either mopping up around what we know or exploring new frontiers. However, in South Gabon we challenge the established idea that after 50 years of exploration the basin is mature, by revealing a new generation of prospectivity with modern 3D acquisition and processing (Figures 1 and 2). The play primarily chased so far has been the Gamba Sandstone play, the seismic imaging of which has always been a significant challenge, owing to the complex velocities in the post-salt geology, the heterogeneity and the halokinesis of the Ezanga Salt. Yet with the exception of the Muruba-2 discovery, few wells have deliberately targeted the syn-rift section below the Gamba, leaving the pre-salt section completely unexplored (Figure 1).
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Utilizing microseismicity to define stimulated surface area and effective permeability
Authors Gisela Viegas, Ted Urbancic and John ThompsonAbstractThe appropriateness of hydraulic fracture stimulation designs can have a significant impact on stimulation effectiveness and the potential productivity of a reservoir. Frac model designs are based on an integration of static (formation geology, velocity structure) and dynamic (bottomhole flowing pressure-normalized oil and gas production, Diagnostic Fracture Injection Testing (DFIT)) data streams. Further constraint on model development can be provided by including additional parameters recorded either prior to or during stimulations. In this regard microseismic monitoring has long been considered as a tool to provide insight into the nature of the stimulation and the effectiveness in developing a well-connected fracture network capable of flow.
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A seismic reservoir characterization and porosity estimation workflow to support geological model update: pre-salt reservoir case study, Brazil
Authors Laryssa Oliveira, Francis Pimentel, Manuel Peiro, Pedro Amaral and João ChristovanAbstractQuantitative seismic interpretation plays an important and growing role for reservoir characterization, as seismic data become increasingly reliable as a result of the latest advances in acquisition and processing techniques.
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Chalk lithology-fluid characterization using regional broadband elastic attributes: an integrated study from the North Sea Central Graben
Authors Noémie Pernin, Cyrille Reiser, Tim Bird and Lucile GoswamiAbstractThe chalk play of the North Sea Central Graben spans the Norwegian, Danish and UK sectors and its reserves approach 10 billion barrels of liquids and almost 5 billion boe of gas.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)