- Home
- A-Z Publications
- First Break
- Previous Issues
- Volume 37, Issue 7, 2019
First Break - Volume 37, Issue 7, 2019
Volume 37, Issue 7, 2019
-
-
Source ghost generation: observations from a dual near-field hydrophone test
Authors Rob Telling, Sergio Grion, Stuart Denny and R. Gareth WilliamsSummaryIn this paper, we investigate source ghost generation using experimental data acquired using a dual-string air-gun array instrumented with two near-field hydrophone (NFH) channels per source element instead of the usual single NFH per source element. The extra NFHs enable us to solve directly for source ghosts, sidestepping the requirement for a ghost model. Experience has shown that the standard ghost model does not always represent well the physics of ghost generation for an air-gun array. In practice this model is typically parameterized via a frequency-dependent effective reflectivity, the magnitude of which often needs to be reduced more than expected for the effects of rough sea-surface scattering. The NFH recordings in this test are compared with synthetic data to highlight problems with the standard model of ghost generation and the results suggest that acoustically induced cavitation is responsible for the observed reduction in the amplitude of the ghost. We show examples of de-signature on seismic data using operators derived with and without a ghost model and discuss the merits and potential issues going forward.
-
-
-
In pursuit of increased resolution while preserving amplitude fidelity
Authors J.M. Reilly, M. Matheney, P. Monigle, K. He, M. Aharchaou, J. Zhang, S. Lazaratos, Z. Lawrence, J. Jackson, K. Nolan and M. ParryAbstractRecent advances in acquisition and processing technology are an enabler for improving the resolution of our seismic images. However, care must be taken to ensure that these imaging enhancements retain the amplitude fidelity necessary to allow for detailed Amplitude Variation with Offset/Direct Hydrocarbon Indicator (AVO/DHI) analysis, particularly in the marine deepwater setting. Acquisition, processing and interpretation all play important and interrelated roles in obtaining the maximum utility from the seismic data. In this paper we will discuss where resolution and data fidelity can be gained or lost, what factors primarily determine bandwidth recovery, and what decisions still need to be made in a somewhat subjective, target-oriented manner. Data from deepwater Guyana is used to demonstrate fundamental principles and the evolution of acquisition and processing workflows over the history of this project. Finally, we will suggest areas where additional improvements can be achieved in seismic field technologies, processing and interpretations workflows.
-
-
-
Offshore wind’s key role in the global energy transition
By Stephen BullAbstractOffshore wind is a zeitgeist technology in the transition from fossil fuels to low-carbon power sources. The way the industry has scaled up and innovated relentlessly, particularly over the last decade, is breathtaking. Some 4.5 gigawatts (GW) of new offshore wind capacity was installed last year, bringing the global total to 23 GW – enough to meet the annual electricity needs of more than 20 million homes a year. Quite an achievement given that there was next to nothing installed before 2000.
-
-
-
Application of distributed fibre-optic sensing to geothermal reservoir characterization and monitoring
Authors Michael Mondanos and Thomas ColemanAbstractGeothermal reservoirs offer unique characterization challenges due to the harsh environment that downhole tools are subject to and the discrete and spatially discontinuous hydrothermal features that make up the reservoir. Enhanced Geothermal Systems (EGS) offer great potential for dramatically expanding the use of geothermal energy by allowing development of traditionally inaccessible thermal resources; thus, offering the possibility to significantly reduce carbon emissions to combat anthropogenically induced climate change. However, EGS development offers an additional set of challenges as reservoir engineers have the burden of not only characterizing the existing reservoir, but to dynamically guide reservoir enhancement in heterogeneous media with a fine degree of resolution and accuracy. Developing EGS resources will require highly advanced and novel characterization and monitoring methods and technologies.
-
-
-
Assessment of underground energy storage potential to support the energy transition in the Netherlands
Authors Joaquim Juez-Larré, Serge van Gessel, Rory Dalman, Gijs Remmelts and Remco GroenenbergAbstractWith the Paris Climate Agreement, the world faces the important task of reducing CO2 emissions to 95% below 1990 levels in 2050. In the Netherlands various measures are being designed for this task, including a transition from fossil fuels towards clean and sustainable energy sources, implementation of energy saving and efficiency measures, and Carbon Capture Utilization and Storage (CCUS). Underground storage can play an important role in delivering solutions. The subsurface is probably the best place for the temporal storage of vast amounts of various forms of energy and the only space for permanent storage of large volumes of CO2.
-
-
-
Subsurface geology offers untapped seasonal energy storage potential to enable large-scale deployment of renewables
More LessAbstractWith the falling cost of renewable energy sources (RES) and the political and public push to decarbonise our societies, the growth of renewable power generation capacity is increasing (CCC, 2019; COP, 2015). This shift from reliable fossil fuel power generation to intermittent and variable RES does lead to some challenges. Indeed, to ensure that this transition operates in a way which ensures the energy system stability is maintained, it is necessary to adapt much more than just the means of generating power. The move towards RES requires the improvement of implementation technologies and best practice. These include, energy storage, more efficient energy use, and energy demand management. Although short-term variations in the generation capacity of RES is manageable with either of the two latter options, energy storage is the only real solution for seasonal variations. The reason being that simply expecting people to not heat or cool their homes is unfeasible.
-
-
-
Mitigating risk in geothermal projects with an integrated modelling approach: a case study in France
AbstractUnlike other renewable energy sources, the successful appraisal and development of geothermal heat require an understanding of the subsurface environment. The resource must be identified and quantified to justify the sustainability of the project. Moreover, the acceptability of the geothermal operations must be ensured for the success of the project.
-
-
-
Building confidence in CCS: From Sleipner to the Northern Lights Project
Authors A.-K. Furre, R. Meneguolo, P. Ringrose and S. KassoldAbstractEquinor’s ambition is to be a leading company in CO2-efficient oil and gas production, and to offer new business opportunities within renewable energy (Figure 1). CO2 handling consequently provides both a challenge and an opportunity. Equinor has long experience with CO2 capture, transport, and storage as operator of TCM (Test Centre Mongstad), Sleipner and Snøhvit fields and also as partner in the In Salah field in Algeria. The Norwegian State is presently leading a new full-scale CCS project, aimed at capturing CO2 from industrial sources and storing it beneath the North Sea. Equinor, together with partners Shell and Total in the Northern Lights partnership, is responsible for FEED (Front-End Engineering Design) of the transport and storage part of this project.
-
Volumes & issues
-
Volume 42 (2024)
-
Volume 41 (2023)
-
Volume 40 (2022)
-
Volume 39 (2021)
-
Volume 38 (2020)
-
Volume 37 (2019)
-
Volume 36 (2018)
-
Volume 35 (2017)
-
Volume 34 (2016)
-
Volume 33 (2015)
-
Volume 32 (2014)
-
Volume 31 (2013)
-
Volume 30 (2012)
-
Volume 29 (2011)
-
Volume 28 (2010)
-
Volume 27 (2009)
-
Volume 26 (2008)
-
Volume 25 (2007)
-
Volume 24 (2006)
-
Volume 23 (2005)
-
Volume 22 (2004)
-
Volume 21 (2003)
-
Volume 20 (2002)
-
Volume 19 (2001)
-
Volume 18 (2000)
-
Volume 17 (1999)
-
Volume 16 (1998)
-
Volume 15 (1997)
-
Volume 14 (1996)
-
Volume 13 (1995)
-
Volume 12 (1994)
-
Volume 11 (1993)
-
Volume 10 (1992)
-
Volume 9 (1991)
-
Volume 8 (1990)
-
Volume 7 (1989)
-
Volume 6 (1988)
-
Volume 5 (1987)
-
Volume 4 (1986)
-
Volume 3 (1985)
-
Volume 2 (1984)
-
Volume 1 (1983)