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- Volume 39, Issue 6, 2021
First Break - Volume 39, Issue 6, 2021
Volume 39, Issue 6, 2021
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Integration of VSP in the process of surface seismic data inversion
Authors N. de Freslon, L. Cuilhe, S. Yareshchenko, Y. Solodkyi, I. Gafych, C. Rudling, N. Lucet, N. Desgoutte and V. MachaultAbstractThe measurements of vertical seismic profiles (VSP) used in the petroleum industry are often limited to direct arrivals to establish time-depth laws. Many other measurements such as PP and PS corridor stacks, offset vertical seismic profiles (OVSP) and walkaway can help to predict P and S wave impedances estimated by inversion of surface seismic data.
This article shows the use of all available VSP records to constrain the inversion of surface seismic data and predict matrix properties of Carboniferous and Devonian intervals in the Machukhske gas field in the Ukrainian Dnieper-Donetsk basin.
The use of PS corridor stack, in addition to PP corridor stack, allows a better optimization of the S impedance at the well. Moreover, corridor stacks allow a better estimate of the P and S impedance below the well TD than surface seismic data alone, and therefore an enhanced characterization of the Devonian sands, which has been drilled by only a few wells. OVSPs help to build a more reliable a priori model by confirming or discarding the faults identified on the 3D seismic data.
Results of reservoir characterization show a clear impact of the VSP integration on lithology prediction from surface seismic data.
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Collaborative VSP acquisition to optimize imaging for field development
AbstractThe DTEK Oil and Gas-operated Machukhske gas condensate field in the Poltava region, central Ukraine, is a Tournaisian ramp carbonate structure in a high pressure and high temperature environment.
The initial surface seismic interpretation of the top carbonate reservoir north of the M-55 well did not fit with the expected geological model. The surface seismic data showed a very steep northern edge, where geologically a gradual ramp had been expected. This interpretation would significantly impact the drilling plans for the area. The area had little well control and the surface seismic data suffered from limitations owing to acquisition geometry; therefore, the well was targeted for Vertical Seismic Profile (VSP) acquisition. The main objective was to provide high resolution imaging along the top carbonate structure to help better understand or resolve the conflict between the surface seismic interpretation and expected geology.
This co-ordinated, flexible and collaborative VSP solution proved cost-effective and successful. Calibrated velocities, high-resolution images and additional information from the VSPs provided a crucial structural update to the interpretation and resolved several issues related to the depositional model.
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New approaches to CCS
Authors Bent Kjølhamar, Sverre Planke, Helge Bondeson, Jan Langhammer, Benjamin Bellwald and Malin WaageAbstractWhile carbon capture and storage (CCS) has been recognized as a major enabler to reduce the amount of CO2 released into the atmosphere, the industry is still in its infancy. Both new technology and cost-effective approaches will be necessary if CCS is to live up to its potential to reduce global warming in the decades to come. Energy data companies such as TGS can, with help from partners, work on concepts and technologies that will be key for the CCS market, and current products made for the oil and gas market can potentially be repurposed for use in CCS. Technologies are also being developed for the 4D monitoring of stored carbon in the decades to come. Furthermore, the storage of carbon within basalt rocks has been proposed by TGS as an alternative to the sedimentary rocks targeted by most CCS endeavours today.
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Engineering design of CO2 storage in saline aquifers and in depleted hydrocarbon reservoirs: similarities and differences
Authors Hakan Alkan, Fernando Flores Rivero, Oleksandr Burachok and Patrick KowollikAbstractThe types of geological structures suitable for CO2 storage are saline aquifers (SA) and depleted hydrocarbon reservoirs (DHR). It is well-known that a direct comparison is often somewhat misleading; the preferences depend on many factors, including availability, logistical and economic concerns. However, advantages and disadvantages in terms of various engineering aspects are often compared.
We summarize the state-of-the-art of knowledge on the use of SAs and DHRs. Physical processes involved, analytical and numerical approaches for capacity and injectivity estimations, containment, wellbore and near-wellbore challenges and logistical options are discussed for both options. Comparisons are made considering engineering design for the onshore and offshore cases together with the preliminary economics.
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Trends in geothermal: riding the wave to Paris
More LessAbstractGeothermal energy is a constant and independent form of renewable energy and has the potential to play a key role towards the world’s future clean energy mix. Conventional and unconventional geothermal resources are largely available across all continents and can help countries to become less dependent on energy imports and build a broader base in their future energy mix (Falcone, 2019). However, despite its significant potential, the total contribution of the geothermal sector to global power generation is 0.3% and to renewable heat approximately 4% (REN 21, 2021). Besides the need to create more substantial political pull and the development of a mature geothermal market across continents, there is also a need for a collective ´technology push´ in order to make geothermal mainstream. This paper provides a stock take of geothermal energy globally and points out technology-driven activities and scientific programmes designed to build a strong subsurface energy value proposition in order to mature two scalable markets: power and heating and cooling.
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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)