OPEN FRACTURE LOCATOR (OFL)
Analysis of Scattered Seismic Waves
Natural Resource Confirmation Tool for Oil, Gas, Geothermal and Minerals
Open Fracture Locator (OFL) directly determines the presence and nature of fluids in the subsurface.
OFL shows the presence and movement of oil, gas and water within a given reservoir. It is a passive seismic technology that enables the study of the 4D distribution of open fracture dynamics. OFL/SVSL’s process detects natural seismic emission (SE) waves generated during a cycle of opening and collapse of micro-fractures known to occur in the Earth’s subsurface, seemingly because of gravitational changes. SE waves are identified in the measured wave field by applying the proprietary Focusing Transformation Algorithm, which helps locate emission centers within open fractures. The behaviour of SE is unique to oil, water or dry saturation in the respective horizon.
OFL is a real-time technology that allows the continuous measurement and processing of the seismic-wave-field to determine the fluid type/fluid saturation, hydrocarbons' distribution, oil-to-water contact, fluid migration and reservoir dynamics for each horizon in a target area. With these capabilities, besides being useful for vertical wells, SLEC can also be applied to plan horizontal drilling/injection wells, monitor hydraulic fracturing and observe water advance in production.
OFL determines reservoir quality by identifying zones of open fracturing which are known for superior productive potential.
OFL is principally a new method of micro-seismic exploration designed to study fracturing in potential reservoirs.
OFL is suitable for oil, gas, and geothermal reservoir monitoring, coalbed methane fracturing (All Onshore only).
OFL Difference - Reprocessing of Seismic Data
There is a fundamental difference between OFL and conventional seismic exploration. Conventional seismic is based primarily on the use of reflected waves, while OFL is based on the analysis of scattered waves. The acoustic impedance of an open fracture is of an order higher than that of other subsurface geological features, causing scattered waves to provide specific information pertaining to open fracturing.
To identify low-power scattered waves in man-made seismic wavefields, OFL uses synchronous stacking of scattered wave signals at 104 and suppression of reflected waves via special observation geometry and its proprietary Focusing Transformation Algorithms.
OFL can reprocess both 2D and 3D-seismic data, or it can be applied real-time in the field using conventional energy sources but through a proprietary acquisition process.
The method is best applied in carbonate rocks and other types of fractured reservoirs.