Services

At WellsGeo, each project involves loading the seismic data into our proprietary visualization system and estimating the dip volume and useable bandwidth.  As an option, well information and pay zones can be integrated into the system to allow for parameter optimization on selected lines before the entire attribute volume is computed. Each attribute volume is then carefully examined in 3D space to ensure that all known features are accurately modeled by the attribute. Once the QC of the attribute is completed, the attribute volume is converted to SEG-Y format and delivered to the customer.

The Unconformity Cube uses a revolutionary approach to identify stratigraphic detail such as faults, channels and depositional sequences that may not be visible on the normal amplitude section of a seismic volume. The Unconformity Cube is a dip steered attribute that uses high ordered statistics to identify changes in a seismic wavelet relative to its neighbors that is not based on cross correlation, semblance or curvature. This new attribute has an increasing amplitude value with unconformity that indicates the degree of difference of the wavelets deviation from zero phase. Subtle phase differences can be linked to unconsolidated depositional sequences and or changes in reservoir composition that can be very important to explorationists for identifying traps and hazards for conventional plays, sweet spot and/or fracture identification in unconventional plays.

The Unconformity Cube

Stratton 3D Input
Unconformity Cube
A classic Frio channel is clearly visible on the input section  as well as the Unconformity Cube, however  additional detail on the Unconformity Cube indicates patterns caused by fluvial  depositional sequences as well additional channeling.

The Stratton 3D seismic dataset was collected and made available for worldwide education and training by the Bureau of Economic Geology at the University of Texas at Austin.

Unconformity Cube
Other research indicates that a possible channel complex exists at 1252 milliseconds, and while there is certainly evidence  of channel features on the input seismic section, the Unconformity Cube shows a variety of stratigraphic detail such as point bars, channel banks and numerous ox bows.

The Stratton 3D seismic dataset was collected and made available for worldwide education and training by the Bureau of Economic Geology at the University of Texas at Austin.

The Attenuation Cube

The Attenuation Cube is a 3D seismic attribute that measures how much energy is being lost in the seismic wavelet as it propagates down through the sub surface. Attenuation can be a very important metric for gauging the amount of gas in a reservoir, and sometimes even attenuation anomalies are seen in oil reservoirs. The Attenuation Cube from WellsGeo uses a proprietary technique to estimate the amount of dispersion by comparing spectral features of each sample to it’s dip corrected neighbors. This improves the signal to noise ratio dramatically before the Attenuation Coefficient is computed, and gives the interpreter a higher fidelity attribute volume that will present finer details that often help in prospect grading, prospect presentation and a better structural interpretation of your prospects.

Attenuation Cube
The Shallow Frio channel is clearly visible on the Attenuation volume with localized anomalies on many of the point bars and appears to be resolving many of the thin bed anomalies in the channel splay.

The Stratton 3D seismic dataset was collected and made available for worldwide education and training by the Bureau of Economic Geology at the University of Texas at Austin.

Attenuation Cube
The deeper area associated with the main producing reservoir shows numerous large anomalies that correlate well with many of the well locations. The WellsGeo Attenuation Cube can be a cost effective metric for grading prospects for natural gas and oil reservoirs.

The Stratton 3D seismic dataset was collected and made available for worldwide education and training by the Bureau of Economic Geology at the University of Texas at Austin.

Bandwidth Extension ( TRE High Resolution)

Bandwidth extension has become an important data product utilized by many exploration professionals. This product is generally produced by estimating the reflection coefficients of the original data and convolving them with a higher frequency wavelet yielding a much higher frequency volume with enhanced structural detail. The WellsGeo implementation of this technology (TRE Temporal Resolution Improvement)  is able to recover high frequency information in the input volume that is much weaker than the dominant frequency. Reflectivity estimation requires that the input spectrum is balanced and the noise is at a minimum. Most seismic volumes do not meet this criteria, but TRE balances the spectrum by estimating and applying Q compensation and applies a proprietary 3D noise elimination process before the reflection coefficients are computed and results in a much Higher Resolution seismic volume. The WellsGeo Bandwidth Extension application can be a very cost effective alternative to an expensive reprocessing effort to resolve issues and results yielding double the bandwidth are very common with this data product.

Input Data – Stratton 3D
40 Hz Dominant Frequency
Temporal Resolution Enhancement (TRE)
120 Hz Dominant Frequency

Volumetric Flexure (Curvature)

Volumetric Flexure or Curvature is a 3D attribute computed from the localized structural trends within  each point in a 3D seismic volume. This attribute is a measurement of how well very small structural deviations from the local dip plane fit to a circle and can show locations of possible fracturing, channeling and other structural features that are not visible using conventional structural attributes. While structural curvature is representative of possible fractures and falting based on the 3D dip information within a volume, the same basic calculations can be computed based on the amplitude changes within each point within a 3D volume. This is called Amplitude Flexure or Amplitude Curvature and can be used for facies classification and or indentifying structural features associated with stratigraphic changes within a reservoir. The images below show the maximum positive and maximum negative flexure at the location of a producing well from a 3D survey located in South Texas.

Maximum Negative Flexure (Curvature)

Maximum Positive Flexure (Curvature)