COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Spatial categorical inversion: Seismic inversion into lithology/fluid classes

## Spatial categorical inversion: Seismic inversion into lithology/fluid classesAdd to your list(s) Download to your calendar using vCal - Omre, H (University of Science and Technology, Trondheim)
- Tuesday 13 December 2011, 15:30-16:00
- Seminar Room 1, Newton Institute.
If you have a question about this talk, please contact Mustapha Amrani. Inverse Problems Modeling of discrete variables in a three-dimensional reference space is a challenging problem. Constraints on the model expressed as invalid local combinations and as indirect measurements of spatial averages add even more complexity. Evaluation of offshore petroleum reservoirs covering many square kilometers and buried at several kilometers depth contain problems of this type. Foc us is on identification of hydrocarbon (gas or oil) pockets in the subsurface – these appear as rare events. The reservoir is classified into lithology (rock) cla sses – shale and sandstone – and the latter contains fluids – either gas, oil or brine (salt water). It is known that these classes are vertically thin with large horizontal continuity. The reservoir is considered to be in equilibrium – hence fixed vertical sequences of fluids – gas/oil/brine – occur due to gravitational sorting. Seismic surveys covering the reservoir is made and through processing of the data, angle-dependent amplitudes of reflections are available. Moreover, a few wells are drilled through the reservoir and exact obse rvations of the reservoir properties are collected along the well trace. The inversion is phrased in a hierarchical Bayesian inversion framework. The prior model, capturing the geometry and ordering of the classes, is of Markov random field type. A particular parameterization coined Profile Markov random field is def ined. The likelihood model linking lithology/fluids and seismic data captures maj or characteristics of rock physics models and the wave equation. Several parameters in this likelihood model are considered to be stochastic and they are inferred from seismic data and observations along the well trace. The posterior model is explored by an extremely efficient MCMC -algorithm. The methodology is defined and demonstrated on observations from a real North Sea reservoir. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
- Featured lists
- INI info aggregator
- Isaac Newton Institute Seminar Series
- School of Physical Sciences
- Seminar Room 1, Newton Institute
- bld31
Note that ex-directory lists are not shown. |
## Other listsPart III Seminar Series Michaelmas 2012 Type the title of a new list here Engineers Without Borders- Cambridge: Talks## Other talksUnderstanding mechanisms and targets of malaria immunity to advance vaccine development Epigenetics - Why DNA Is Not Your Destiny Slaying (or at least taming) a dreadful monster: Louis de Serres' treatise of 1625 for women suffering from infertility Fukushima and the law Beating your final boss battle, or presenting with confidence and style (easy mode) Evolution in island colonising birds: silvereyes of the south Pacific Art and Migration Alzheimer's talks Discovering regulators of insulin output with flies and human islets: implications for diabetes and pancreas cancer "The integrated stress response – a double edged sword in skeletal development and disease" BP KEYNOTE LECTURE: Importance of C-O Bond Activation for CO2/COUtilization - An Approach to Energy Conversion and Storage Hypergraph Saturation Irregularities |