Our Technology

Our Technology

Statistically Optimal Processing

Proprietary, patent pending, Statistically Optimal (SO) processing delivers results where standard Seismic Emission Tomography (SET) fails due to the presence of complicating factors such as high coherent noise in the seismic signal and when imaging non-explosive events. Since this is the case during fracking and reservoir production SET frequently delivers results of dubious value.

Our SO processing is based on a maximum likelihood statistic approach considering the noise affecting array sensors as correlated in time and between sensor components themselves. Along with enhancement of reliability and accuracy of the source location the procedure allows for simultaneously estimating the parameters of the source mechanism. All available information about medium structure and source mechanism can be accounted for in this procedure.

The SO technique allows EII to determine the source mechanism (fault plane solution) of events with low (less than 1) Signal to Noise Ratio (SNR). Both event location and mechanism are computed in a single step using only multichannel surface array data. This approach is based on introducing additional procedures for computation of polarities and amplitudes of signals generated by complex source mechanism at array sensors. These procedures are aimed towards the compensation of array signal “coherency loss” for shear type mechanism and the reduction of noise influence on reliability of source detection and location.

The algorithms that we apply in the noisy environment of hydraulic fracturing are PRSO (Phase Robust Statistical Optimal) and DML-ASO (Diagonal Maximum Likelihood Adaptive Statistical Optimal). With these techniques for SNR = 0.05 the location accuracy of our Statistically Optimal algorithms is 20-40 times better than what SET algorithms can provide.