#Vista seismic how to#

Using a Gassmann-consistent model of fractured porous media. Elastic Born inversion for fracture density Journal of Geophysics and Engineering, under preparation.Ģ. Inversion in HTI media: Effects of fracture-fracture interaction. Our methods can in principle also deal with multiple fracture sets, and numerical experiments related to this can now easily be performed in future projects.ġ.

We have also investigated effects of pore fluid pressure communication between aligned fractures and pores. We have made the theoretical foundation and the first proof of concept of using a transport matrix for one fracture set to invert for fracture density. The most important advantage for this method from a geological point of view is that fracture parameters are much more relevant for interpreting the rock. Also by inverting only for fracture parameters, we do not only reduce the number of unknown model parameters, but also obtain a more stable and robust solution to the inverse problem. Thus increased the calculation speed and made elastic wave inversion more accessible. In this project, we have used a rock physic model to reduce this number to only a few. That means that many independent factors that determine the behaviour of the wave. Although these fractures are small, they are very important to understand for those that search for fluids beneath our feet, as these fractures can contain much of the fluids we can extract and they can be crucial in the fluids ability to flow within the rock.Ī seismic wave is generally an elastic wave. In such conditions, we cannot see the individual fracture, but we can detect the gathered response of many. This means that the fractures are smaller than the wavelength that we study. We call such small fractures sub-seismic. Some of the conditions that alters the waves can be the type of rock that the wave travels through, it can be big faults or it can be small fractures or cracks in the rock that are filled with water or oil and gas. Thus are we able to look inside rocks and the earth itself. In both cases will the wave be altered by the rock that it travels through and with theoretical models it is possible to invert for which conditions that have caused the recorded signal. These waves may originate from a natural earthquake or from artificial shots.

Seismic data is recordings of waves that have travelled through the earth.

#Vista seismic how to#

The goal of the project was to understand fractures in reservoirs and how to glean the fracture properties from seismic data.