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Reservoir-Oriented Delineation Tech nology



The oil & gas industry is requesting information about
commercially marginal reservoirs which at present is not
obtainable using standard geophysical approaches. Advanced
and accurate techniques have to be available in a fast and
efficient way and the turnaround time for applying the methods must be reduced. The main objective of the project is to
establish a prototype of a reservoir-oriented delineation
technology fulfilling these requirements. The technology is bounded, in the sense that it is confined by 3D seismic data observed on the surface or in boreholes, and 3D elastic models are derived which are the products of applying the technology to the observations. The technology itself consists of:
- The technology frame (skeleton), and
- Sub-technologies acting within the frame.
The development of the two parts constitutes the project's
secondary objectives.

Technical Approach

The frame is constructed on the basis of a general description of the geophysical technology specifying that its product,
i.e. the model, is optimum when the derived and processed
forward responses are comparable to the observations processed in similar way. Hence the frame and its implementation will be able to represent the model, the forward response function,
the responses and observations. The frame will also include
the model justification, coupling the observation and
modelling domains.

The two first sub-technologies to be accessible are the 3D
elastic model building part and technologies dealing with the processing of the observations and forward responses. The
model builder utilizes a sophisticated cell-oriented approach to describe the subsurface and is capable of retaining
consistency by adjusting minor structural features. To perform the processing in both domains the frame is interfaced to
available extended seismic processing packages.

The last two sub-technologies, ray-tracing/3D ray-Born
diffraction forward modelling and the corresponding automatic model-adjustment/justification by inversion (tomography and
imaging), are included towards the end of the project period.
Expected Achievements and Exploitation

The project will achieve three major goals:
- The technology applied to real observations will provide
the means to produce proven 3D elastic reservoir models.
- The technology frame will act as a base to absorb products (sub-technologies) directly from research institutions.
- It will become easier to pin-point sub-technologies to be adjusted for higher accuracy and lower turnaround time.

The future exploitation of the technology in an industrial
sense will be evaluated throughout the project period based on the real case experiences and on market investigations.


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