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74th EAGE Conference and Exhibition - Workshops
- Conference date: 04 Jun 2012 - 07 Jun 2012
- Location: Copenhagen, Denmark
- ISBN: 978-90-73834-28-6
- Published: 04 July 2012
151 - 156 of 156 results
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Integration of Dispersion Curve and Full Waveform Inversion Techniques for Onshore Velocity Model Building – Inner Mongolia Study
Authors Alexander Droujinine, Ren-douard Plessix and Fabian ErnstWe develop an integrated velocity model building workflow for prestack depth imaging in onshore settings with a complex shallow subsurface. This workflow incorporates dispersion curve inversion and full waveform inversion into a single framework to optimize the advantages of each. An accurate near-surface velocity is derived using the dispersion curve inversion technique that overcomes limitations of traditional traveltime tomography. This velocity is then incorporated into layer-stripping full waveform inversion. We illustrate the workflow on an experimental data set from Inner Mongolia, whose long-offsets and low-frequency content provide the necessary input for both the dispersion curve and full waveform inversion techniques.
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Microseismic Geomechanics – Complexity Simplified
Authors Alexander Droujinine, Joel Ita and Steve OatesAdopting the Kostrov methodology we determine a strain rate tensor for any grid area in 4D by summing source moment tensors of microseismic events. The predicted strain rate tensor is used to provide a priori constraints on the style and direction of the observed deformations. This is a hybrid method that is shown to reduce uncertainties of geomechanically modeled displacement field in a depleting reservoir during the monitoring period. The improved microseismic-to-geomechanics link is seen as a key step to reservoir modeling and to the future realization of reservoir management value from this technology.
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Microseismic Geomechanics – Complexity Simplified
Authors Alexander Droujinine, Joel Ita and Steve OatesAdopting the Kostrov methodology we determine a strain rate tensor for any grid area in 4D by summing source moment tensors of microseismic events. The predicted strain rate tensor is used to provide a priori constraints on the style and direction of the observed deformations. This is a hybrid method that is shown to reduce uncertainties of geomechanically modeled displacement field in a depleting reservoir during the monitoring period. The improved microseismic-to-geomechanics link is seen as a key step to reservoir modeling and to the future realization of reservoir management value from this technology.
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Shallow Shear Wave Reflections: What Can the Amplitude Tell Us and How?
More LessShallow shear-wave reflection method at present is entirely restricted to the use of reflection time information. The average velocity is estimated from the travel time, whether in stacking velocity analysis, tomographic inversion, or in other processing schemes. Use of reflection amplitude has remained challenging primarily due to source and receiver effects camouflaging geologically meaningful amplitude perturbation. We have found ways to improve amplitude fidelity and reduce the effect of source and receiver coupling variations. When tested on real field data, shear-wave reflection amplitude as a function of incidence angle is found to provide useful near-surface interfacial information. Moreover, when frequency-dependent reflection amplitudes are looked at using the pertinent theories of poroelasticity, we find that those reflection amplitudes seem to contain even further information about the flow properties and the state of stress in the near-surface. These information are crucial to diverse practical applications.
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The Road to Open Source: Sharing a Ten Years Experience in Building OpendTect, the Open Source Seismic Interpretation Software
By Hlne HuckOpendTect is a complete Open Source seismic interpretation system, available for already ten years. We demonstrate that Open Source as a business model can be successful in the oil and gas industry provided you pay extra attention to a few key points. We discuss the importance of the Freemium business model and use our experience to list important topics to consider when going Open Source. It covers a wide range of issues going from communication with the users’ community and stimulation of research and development to the architecture of the software code itself.
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Estimating thermal conductivity from geophysical well logs: Selected boreholes in Danish sedimentary basins
Authors Thue S. Bording, Niels Balling and Søren B. NielsenEstimating temperatures in sedimentary basins and geothermal reservoirs requires knowledge of heat flow, thermal conductivity, heat production, and the surface temperature history. Contrary to heat flow, thermal conductivity typically shows large local variability, both on vertical and horizontal scale, resulting in large variations in temperature gradients. Accurate estimates of thermal conductivity are thus of paramount importance.
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