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Keywords: knowledge
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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428013
... Prior information is essential for statistical seismic inverse problems to quantify uncertainties of unknown subsurface parameters. Conventional prior knowledge is based on empirical observations of subsurface structures like the smoothness of the subsurface image. However, such hand-designed...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3415191
... learning artificial intelligence directional electromagnetic loggingwhile-drilling data iteration inversion drilling data acquisition upstream oil & gas descent direction exploration geophysicist 10 electromagnetic lwd data seg international exposition knowledge learning technique...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3204480
... by the process of human learning knowledge: When learning new knowledge, humans often use the experience accumulated in the past to deepen the understanding of knowledge, but the experience may contain error information, therefore we need to constantly revise our understanding with examples until we master...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216640
... that knowledge of shallow geological units helps to predict deeper units when there are only a few labels for training using a dataset from the Sea of Ireland. We employ U-net based multi-resolution networks, and we show that these networks can be described using matrix-vector product notation in a similar...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216601
... of the recorded data, preventing them from reaching more accurate images of the subsurface. Thus, in addition to the information from the recorded data, it is imperative to add more information in FWI. In this work, the inclusion of the knowledge regarding correlations found between the P-wave velocities...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2995155
..., University of British Columbia SUMMARY Geophysical inversions are an essential tool for mapping the subsurface. However, the image of the underground retrieved from an inversion rarely benefits from the full range of knowl- edge. Geologic knowledge concerning petrophysical relation- ships and geologic...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997015
... knowledge neural network interpreter algorithm deep learning interpretation deep learning application laura bandura annual meeting seismic image reservoir characterization seg international exposition zhang chevron energy technology company machine learning artificial intelligence training...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17404128
... imaging localization optimization problem knowledge reservoir characterization seg seg international exposition velocity model update objective function annual international meeting annual meeting upstream oil & gas time-shifted gather estimation artificial intelligence moveout...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5830429
... seismic imaging reservoir characterization knowledge Nonlinear seismic imaging via reduced order model backprojection Alexander V. Mamonov , University of Houston; Vladimir Druskin and Mikhail Zaslavsky, Schlumberger SUMMARY We introduce a novel nonlinear seismic imaging method based on model order...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5870761
... Summary A successful microseismic monitoring project often relies on proper planning and execution. In terms of the planning phase, many factors come into play. Unfortunately, our prejob knowledge is often limited. At best, information can be derived from previous monitoring results...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5899742
... of saltwater intrusion. As part of this investigation local community members from the island were engaged in training and use of near-surface geophysical instruments, as well as to share their knowledge so that it could be integrated into the investigation. Introduction For the 1600 Indigenous residents...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0897
... waveform inversion when applied on reflection data. Then we show that, if a prior knowledge of the reflectivity is available, reflected waves can be exploited to retrieve the long wavelengths of the velocity, in particular when we use appropriate misfit measurement as the cross-correlation that overcome...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0795
... Summary Accurate locations of the microseismic events form the basis for interpretation of hydraulically stimulated regions. The velocity model, which in general is not well known, has a significant impact on the accuracy of located events. Correct knowledge of the anisotropy parameters...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0837
... volume. Our 3D model recovers a shallow dipping conductor, which coincides well with the plate model of the zinc zone, as well as a large conductor below 1000m depth. Our inversion is done without incorporating prior knowledge and there is always the potential that large features at depth can...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-1950
... Summary We consider two methods for inversion of time-lapse electrical resistivity imaging (ERI) data based on the concept of informed imaging, defined as the incorporation of all prior knowledge about a site into the acquisition, inversion, and interpretation of data. The first method uses...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0576
... reservoir characterization competition geoscience affiliate geophysicist young recruit knowledge interpretation The Main Evolutions of Geosciences Training Philippe JULIEN*, Jacques ESTIVAL, Jean-François COSTE, TOTAL S.A., CSTJF, Pau, France Summary We can presently observe some major evolutions...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-3492
... with a single well imaging geometry with downhole sources and receivers and directly acquire specular reflections from the salt flank. Here the only velocity model we need to concern ourselves with is the velocity of the sediments between the receiver array and the salt flank; no knowledge of the overburden...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2341
.... longitude geodetic framework location data convergence angle application well-centric data geodetic issue geodetic measurement information convention reference frame knowledge deviation survey standard deviation seg houston 2005 upstream oil & gas geodetic reference frame database...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2111
.... The construction of the second image requires knowledge of the velocity model to the depth of the up to down reflection in the internal multiple. We illustrate this theory with a synthetic data example and examine the sensitivity of the method to the velocity model. velocity model equation prediction...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-0193
... that the results are most accurate when shear-wave reflectivities are utilized and when rock parameters are well known. However, even with imperfect measurements and knowledge, the inversion may yield distributions that are sufficiently narrow to distinguish gas from brine saturated porous sandstones, and provides...

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