Divine - Microseismic and Seismic Tomographic Imaging Software

Divine is a modular, 2D and 3D active and passive seismic (microseismic) imaging package for crosshole, VSP, surface reflection, single well and critical refraction surveys and real time microseismic monitoring. The principle functions of Divine are:

  • Wavefield processing
  • Trace interpretation
  • Raytrace modelling
  • Tomography
  • Pre-stack migration
  • Microseismic data acquisition
  • Microseismic processing

The complete range of Divine functions and the modules are defined in the specification. Some of the applications of the package are illustrated here using examples from the demonstration version. In the demonstration version all the facilities of the package are available but new surveys cannot be defined.

For licence enquiries or to request a CD copy of the demonstrations please contact Ben Dyer.

Download Divine specification
Download Divine demonstration
Download Divine microseismic brochure


Fracture Monitoring Trace Gather and Event Locations

Microseismic events are typically monitored using either a string of 3 component sensors within a single borehole or a widely spaced network of sensors at the surface or downhole. Using a sensor network, the event hypocentres may be found using P and S traveltime data alone. If a string of sensors has been used, it is normally necessary to derive the event direction as well. Processing of both these types of acquisition are demonstrated.

In geothermal applications event rates can exceed 200 events per hour. To process these data a proprietary automatic technique has been developed which is referred to as the Bootstrap method. In tests with event data from a sensor network, the Bootstrap method successfully processed all the events that could be identified visually. Divine also incorporates a range of trace display facilities that enable P and S times to be efficiently picked or checked interactively in a consistent manner which is important in obtaining reliable event locations.


Crosshole Tomography

Graph of Model Tomogram and Traveltime Errors

Tomographic velocity imaging can be applied to any form of transmission data, including crosshole, VSP, critical refraction and cross gallery. It is also applicable to reflection data for known reflector geometries or reflectors imaged by migration. The illustration shows crosshole transmission imaging of an anomalous body. The lefthand window contains the tomogram and interpretation of the outline of the body and a deeper interface. The righthand window shows the misfit in milli-seconds between the data and the traveltimes through the tomogram.

Graph of Field Data Tomogram and Source Gather

These data were collected in a metamorphic sequence. The right hand window shows the interactive interpretation of a shot gather. The trace data have been processed to remove tube waves that were prevalent at this site. The transmission velocity tomogram on a vertical section is shown on the left. Ray bending has been performed at the interpreted velocity boundaries, indicated by the continuous black lines crossing the image. Low velocity, cooler colour, regions may be interpreted as zones of fracturing.


VSP Migration

Graph of VSP Depth Migration

The illustration shows pre-stack depth migration of a VSP data set. The migration region has been limited to the area of reflection point coverage from the middle to the left of the survey region. The reflector aperture covers reflector dips of +- 3° plus a taper length of 5°. The wavefield has been normalised with respect to the reflection point hit count and the traces are plotted with trace by trace scaling as an overlay on the velocity model.

The main feature of the migration is an offset in the reflectors across a possible reverse fault.

3D Transmission Imaging for Cavity Detection

Graph of 3D Tomography Cavity Modelling

Forward modelling of a cavity detection type application in a limestone region is illustrated. The model consists of a near surface low velocity layer and one large and one small collapse zone. The collapse zones are continuous in the North-South direction. These zones have been imaged in 3D using two simulated crosshole surveys in the East-West / Depth planes. The two survey planes are 10m apart in the North-South direction. Sources, shown by crosses are located at 2m intervals on the western side of the survey region and receivers, shown by circles, are located on the eastern side of the survey region. The survey planes are at 0m and 10m North. The right hand window is an interactive 3D rotational display showing the intersection of selected velocity image planes through the 3D velocity field. This view may be used to display various combinations of coordinate data and image sections for interpretation purposes.