At Landtech, we are driven to help our oil and gas company customers solve their toughest operational and imaging challenges. Their easy to locate oil and gas reserves have been found. To find other reserves requires the application of advanced geophysical methodologies. Passive Seismic Tomography (PST) first introduced by Landtech is a revolutionary, scientifically proven technology. Whether you’re sizing up the prospectivity of a frontier thrust belt basin, working to extract maximum value from a mature reservoir or encountering severe seismic penetration problems, our well proven technology can help.
One of the more perplexing areas in the upstream hydrocarbon industry is subsalt exploration and reservoir development. This is because the salt layer distorts the seismic energy, posing unique imaging challenges. Landtech is unrivaled for imaging complex salt bodies since the seismic sources (microearthquakes) are within or below the target we are looking for. Landtech has extensive experience in successfully acquiring, processing and interpreting seismic data in subsalt regimes.
Featured Case Study
A major oil company had amassed a vast portfolio to explore a thrust belt region in Greece however encountered severe geological problems. The acreage was believed to be highly prospective but the potential reservoir targets were difficult to image. Many were obscured by salt bodies and extensive salt sheets. The high topographic reliefs increased the cost of conventional seismic surveys which also when applied failed to provide any useful results. Landtech was therefore asked to map in detail the evaporate (see picture below.)
Click here to watch 3D Vp video of the velocity structure below the entire exploration block.
Basalt reservoirs are particularly difficult to image. Basalt flows often have rugose tops and interbed surfaces that, together with fracturing, cause scattering of the seismic energy. This leads to both noisy data and complicated ray-paths that require sophisticated techniques to correctly image the subsurface. Survey designs that capture long-offset data and acquisition techniques that enhance low-frequency content can help with sub basalt exploration. However, their results cannot be compared with the accuracy of our PST methodology. In our approach we shoot the envisaged target from below, avoiding all the aforementioned problems and at a fraction of the cost of the conventional seismic methods.
Among global hydrocarbon provinces, thrust belts are the most complex geological systems and technically challenging environments for exploration. Thrust belts are typically associated with difficult and environmentally sensitive areas, making acquisition costly. Such difficult terrains, which often include steep mountains and foothills, can suffer from near-surface data and ray-path problems. Landtech makes it easier for operators in thrust belt regimes to just deploy only a few passive seismographs. There is no need to deploy thousands of geophones. Passive seismographs can be easily installed at selected points and will monitor any seismic sources.
Featured Case Study
A major oil and gas company encountered exploration problems in trying to find potential traps in their thrust belt block in SE Albania. A region notorious for extremely complicated geology. Landtech not only succeeded in providing detailed 2D and 3D geological models but also pinpointed locations of considerable oil and gas reservoirs.
Click here to download a paper recently published in Geophysics describing this successful case history.
Comparison with VSP results
We are so confident about the accuracy of our revolutionary PST methodology that we can even compare our PST results with results from a VSP survey. The following example is from a well in a block in SE Albania where LandTech performed a 3D PST survey. After the well was drilled we compare the Vp velocities obtained from the sonic log with those obtained from the PST survey. The difference was less than 5%!
Click here to see many successful examples of problems solved by our PST technology.