The project is concerned with the analysis of seismic data to determine high resolution estimates of the physical properties of hydrocarbon prospects that are of particular concern to production geologists and reservoir engineers. The project will contribute to improving the effectiveness of hydrocarbon exploration and production by developing new stratigraphic methods for geological structures.
The major objective of the project is to relate a range of seismic attributes to the lithological properties of the reservoir. Improvements in resolution of the images of the prospect are obtained by a judicious combination of constraints from geological information, wireline log data, VSP, crosshole and surface seismic data. Studies will be carried out to determine the most effective ways of combining these various datasets. Current modelling, data analysis and inversion procedures will be developed and extended to take account of the elastic, anisotropic and attenuative properties of the Earth and inversion schemes will be designed for multi-component data.
The project is sub-divided into six closely related topics.
Topic A: Outcrop Study: Geological/Seismic.
Involves the simulation of two-component seismic data on a hydrocarbon related geological model based on the study of an outcrop and its subsurface equivalent. It is recognised that information extracted from S-waves has the potential to bring about a major advance in seismically driven reservoir description.
Topic B: Processing and Analysis.
Methods of two-component processing and interpretation are investigated. These include wavefield decomposition procedures to isolate individual components in P and S-wave recordings and relating P and S-wave propagation characteristics to rock properties through detailed analysis of surface and downhole seismic data and well logs.
Topic C: Numerical Forward Modeling.
The nature of seismic wave propagation through complex reservoir structures will be studied. Existing elastic modeling schemes will be used for this purpose. However, the studies will be extended with theoretical and numerical investigations of wave propagation in porous and visco-elastic, anisotropic media. The remaining three topics are concerned with the inversion of the seismic data and the creation of the final product which, in general, is a picture or pictures of the sub-surface region under investigation.
Topic D: Target Oriented Inversion.
Involves the development of multi-component inversion procedures. Problems of anisotropy are also addressed.
Topic E: Tomographic Imaging Methods.
Concepts of tomographic imaging are developed which include the utilisation of the strong constraints provided by VSP and crosshole datasets. Topic F: Three-dimensional Inversion.
A method of high resolution global inversion of seismic data for 3-D geological models and reservoir characterisation is developed.
Funding SchemeCSC - Cost-sharing contracts
TW16 7LN Sunbury-on-thames
WC1E 6BT London
2100 København Ø