Processing and interpretation of geophysical data

    High-quality processing and interpretation of seismic information are key stages of obtaining informative and reliable data. Carrying out similar works at the necessary level not only demands presence of sufficient computing capacities and the expensive specialized software, but also is absolutely impossible without high qualified geophysicists involved in process.
 
    Our specialists are graduates of the leading universities of St. Petersburg and have the extensive work experience, including the experience received as a result of a number of successful full cycle projects (from collecting the field information up to interpreting the final results).
 
    It should be noted that deep acquaintance of our specialists with their own original field equipment and work in close cooperation with technical specialists and developers allow achieving the full potential when processing and analyzing the data.
 
    Our services in processing and interpretation of seismic data:

  • Processing of CDP reflected waves method data

  • Processing of DSS refracted waves method data

  • Specialized processing

  • Interpretation of seismic data

 
Processing of CDP reflected waves method data

    Our company renders services in processing common depth point reflection acquisition data. Efforts in this direction are performed by a team of highly skilled geophysical specialists using modern productive equipment and advanced software. 2D and 3D data are processed as follows:

  • Loading primary data;

  • Creating a geometry database;

  • Data quality control;

  • Signal pre-stack processing;

  • Multiple waves suppressing;

  • Creating of depth-velocity model;

  • Combining seismic data obtained using different methods;

  • Pre-stack migration in time or depth domain;

  • Data processing after migration. Obtaining final sections and cubes.


Processing results:

  • Seismic sections (cubes) according to the common depth point reflected waves method in time or depth domain after pre-stack migration;

  • Depth-velocity models.

 

DSS refracted waves method

 

    Our company renders services in DSS refracted waves method data processing. Full graph from preliminary processing of field data up to obtaining final depth sections of various types. Operations are performed at the modern level, using various approaches to creation of medium depth models and their subsequent verification that increases informational content and reliability of results. Our specialists have experience of performing a number of large projects on processing DSS refracted waves method data.

 

    Principles of processing DSS data:

  • Preliminary processing of field data (introduction of corrections for spending time and source instability, geometry assignment)

  • Dynamic processing of seismograms (increase of seismic recording resolution, useful waves) (SeisSpace)

  • Creation of a dynamic section on the refracted waves (SeisSpace) (Figure 1)

  • Generation, correlation and reading of the first and subsequent wave arrivals of various types (refracted, diving, reflected, multiple, exchange, cross waves) (XTomo-DPU) (Figure 2)

  • Seismic tomography according to the first arrivals (XTomo-LM)

  • Creation of preliminary depth model of the medium (based on tomography according to the first arrivals, system of calculated distance-time graphs and dynamic section) (XTomo-LM, SeisWide)

  • Layer-by-layer seismic tomography (refracted and reflected waves) (XTomo-LM) (Figure 3)

  • Solution of a direct kinematic task (refracted, diving and reflected waves) (SeisWide) (Figure 4)

  • Verification of depth models (dynamic modeling, solution of a direct task depending on various types of multiple and exchange waves, reflecting platforms) (SeisWide) (Figure 5)

  • Creation of summary depth model

 

    Processing results:

  • Depth-velocity gradient model (seismic tomography result based on the first arrivals) (Figure 2)

  • Depth-velocity layered and gradient model (seismic tomography result with wave division)

  • Depth-velocity layered and gradient model (result of solving a direct kinematic task)

  • Summary depth-velocity layered and gradient model

 

    Obtained new data on the medium structure:

  • Specifying a geological and geophysical depth structure of the crust

  • Specifying the crust thickness

  • Determining the position and geometry of basic section boundaries, including Moho)

 

 

 

 

 

Specialized processing

 

    Today, requirements to informational content of results of processing and interpretation of seismic data significantly increase. For a wide range of actual tasks, standard approaches are not sufficient and there is a serious need of using additional methods allowing along with traditional methods to obtain more detailed information about geological medium structure, lithologic, facial structure, fluid saturation and other important parameters.

 

    Our company renders services in profound specialized processing of seismic data. At each stage of operations, we perform a deep monitoring of all obtained results with an assessment of their reliability and the detailed analysis of all available materials of this object. Our specialists carry out the following types of specialized processing:

  • AVO and other types of the dynamic analysis;

  • Processing of microseismic data;

  • Processing of multicomponent 3C (4C) data;

  • Creation of dynamic images on the refracted waves;

  • Joint processing (combination) of the geophysical information obtained by various methods;

  • Development of algorithms and software for solving specific tasks of concrete surveys.

 

Seismic data interpretation

 

    After receiving final results of seismic data processing, it is necessary to carry out their high-quality interpretation (only in this case, maximum extraction of all geological information contained in seismic data is possible).

 

    High professionalism of our specialists and attraction of modern software and powerful computing tools provide for consistent high quality of analysis and interpretation of geophysical information.

 

    List of works:

  • Complex analysis of geological and geophysical information;

  • Stratigraphic control of the reflecting horizons;

  • Structural creation of the target horizons;

  • Specifying of seismic stratigraphy analysis complexes and tectonic violations;

  • Determination of fracturing and anisotropy parameters;

  • Forecast of filtrational and capacitor properties of rocks;

  • Development of original interpretation techniques;

  • Forecast of collector development areas;

  • Development of seismological model.