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- Volume 30, Issue 2, 2012
First Break - Volume 30, Issue 2, 2012
Volume 30, Issue 2, 2012
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Unrecognized 'fracture caging' could make shale drilling safer and more profitable
Authors R. Weijermars, X. Zhang and D. Schultz-ElaRuud Weijermars (TU Delft, The Netherlands), Xi Zhang (CSIRO, Australia), and Dan Schultz-Ela (Colorado Mesa University, USA) explain how they independently happened on the previously unrecognized phenomena of ‘fracture caging’ which, if identified during drilling operations, could increase substantially the potential output from shale formations. A detailed paper on the findings will be published in a forthcoming issue of First Break.
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What do we mean by sustainable energy?
More LessPhilip Ringrose discusses the definition of sustainable energy in the light of the EAGE’s first conference on Sustainable Earth Sciences held last November.
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Methodologies for CO2 storage capacity estimation: review and evaluation of CO2 storage atlases
Authors R.M. Prelicz, E.A.V. Mackie and C.J. OttoR.M. Prelicz, E.A.V. Mackie and C.J. Otto provide a guide to current atlases of potential CO2 storage locations around the world with a critique of the different approaches adopted in a field where no standard terms and definitions have as yet been established.
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Geomechanical response to CO2 injection at Krechba, In Salah, Algeria
Authors L. Gemmer, O. Hansen, M. Iding, S. Leary and P. RingroseLykke Gemmer, Olav Hansen, Martin Iding, Simon Leary and Philip Ringrose discuss the geomechanical modelling of the rock mechanical response to CO2 injection at the Krechba gas field in Algeria arguing that key factors to understanding are the sensitivity of the model to the initial stress field and the rock-mechanical properties of the fault/fracture zones.
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How the first US integrated regional CCS demonstration project became a reality
Authors Gerald R. Hill, Kimberly A. Sams, Traci Rodosta and Bruce BrownGerald R. Hill, Kimberly A. Sams, Traci Rodosta and Bruce Brown detail the extraordinary labyrinth of technical, regulatory, environmental, and other requirements which had to be negotiated on the way to establishing the first regional integrated carbon sequestration demonstration project in the US, designed to provide a better understanding of the challenges that power plant capture can present to the emerging field of geologic CO2 storage.
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Enhancing shale gas reservoir characterization using hydraulic fracture microseismic data
Authors Shawn Maxwell and Mark NortonShawn Maxwell and Mark Norton present a case study showing how microseismic data can be a useful part of the mix of geotechnical information sources that, when combined, provide valuable information about shale gas reservoirs.
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Airborne and ground geophysical investigation of the abandoned salt mine environment along the Stassfurt-Egeln Anticline, Germany
More LessIn the area of the 1200-year-old town of Stassfurt, where the world’s first potash mine was opened in 1852, sinkholes emerged during mining and the town’s centre slowly subsided. Mining has increased the subsidence due to collapses and uncontrolled flooding of abandoned salt mineworkings, the dissolution of salt in the mines, and the pump-driven drainage system. In order to investigate possible consequences of salt-mine flooding, this area was selected for the study of the dynamic processes in flooded or abandoned mineworkings and their overburden. As part of a multi-disciplinary research project, the German Federal Institute for Geosciences and Natural Resources (BGR) conducted an airborne geophysical survey covering the salt anticline in summer 2007 with the aim of acquiring extensive electrical conductivity datasets to show the regional hydrogeological and geological structures down to about 100 m depth. Areas with distinct conductivity anomalies were subsequently selected for more detailed studies using ground geophysical methods such as DC geoelectrics and transient electromagnetics (TEM). The conductivity data revealed several hydrogeologically important features, such as the distribution of salt water, areas of salt-water rise, Quaternary channels, and fresh-water influxes. The airborne data also served as base-line data for ground follow-up studies and 3D hydrogeological and geological modelling.
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Elastic anisotropy in the Haynesville Shale from dipole sonic data
More LessWorldwide interest in shales as hydrocarbon resources has increased in recent years, driven mostly by the successful development of gas shales in North America. One of these gas shale plays is the Haynesville Shale located in Texas and Louisiana. In this paper we analyse dipole sonic log data acquired over the build section of a deviated well and show how these data can be used to estimate the elastic anisotropy of the formation. In this case the formation is relatively homogeneous over the build section and so the deviated well allows the sampling of well deviations from approximately 50° to horizontal. Using the compressional, fast-shear, and slow-shear data as a function of the well deviation angle, we estimated the anisotropy for the gas shale. These anisotropy estimates were then used to remove the anisotropy effects observed in the deviated well. Comparison of these ‘corrected’ sonic logs to sonic logs acquired in the vertical pilot well shows good agreement.
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4D-3C geomechanical study of in-situ bitumen recovery in NW Canada using Toe-to-Heel Air Injection
Authors K. Wikel, R. Kendall, R. Bale, J. Grossman and K. DeMeersmanRecent observations of shear-wave splitting in the near surface have been interpreted as a consequence of the stress state rather than the presence of fractures. The analysis of such shallow anisotropy measurements from shear-wave splitting on converted-wave data allows us to evaluate caprock integrity and detect areas where the stress in the caprock may deviate from the regional faulting regime. This information is vital in discerning whether the caprock is able to withstand recovery of shallow in-situ bitumen and heavy oil. Moreover, using time-lapse multi-component data, we can use the changes in splitting azimuth and time delay to monitor overburden and reservoir changes occurring during production. Here we show that converted-wave splitting changes, observed at the Conklin Demonstration Project between 2008 and 2009, can be directly correlated to changes occurring in the overburden. Additionally, we show that the stress state of the overburden, and in particular the transition from one stress regime to another with depth, is considerably more complex than has generally been assumed.
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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)