Seismic data interpretation

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Seismic data interpretation projects (designs) are executed by using the most sophisticated hardware and software packages, the main one of which is Schlumberger Petrel 

The main stages of the integrated interpretation of the geophysical data are as follows:

1. Substantiation of the stratigraphic referencing of the reflectors:

- interpretation of the vertical seismic profiling;

- one-dimensional and two-dimensional seismic modeling;

- evaluation of convergence quality of the real and synthesized traces;

- evaluation of the formation dynamic expressiveness in the wavefield;

- use of seismic stratigraphy principles for reflectors identification;

- computation of seismic markers based on VSP and acoustic sounding;

2. Detailed correlation of the reflectors:

- automated 2D-3D correlation;

- adjustment of correlation in zones of faltering tracing of the reflectors as the result of analyzing amplitude correlation dependence upon net thickness and average reservoir porosity;

- control of correlation accuracy in faltering tracing zones;

3. Delineation and tracing of tectonic dislocations while conjointly analyzing:

- seismic sections;

- seismic attribute maps;

4. Time-structure mapping:

- map smoothing;

- map editing;

- 3-D map and map block analysis;

5. Substantiated selection of the velocity model and structural imaging based thereon:

- analysis of the vertical velocity spectrum;

- analysis of the horizon-oriented velocity spectrum;

- analysis of the accuracy of the developed velocity-depth model;

- calculation of the interval and medium velocities for all targeted horizons;

6. Structural imaging and analysis of the stratal surfaces of the targeted formations and key reflectors. Confidence estimation of structural imaging:

7. Seismic inversion:

- calculations of acoustic impedance sections;

- AVO – elastic inversion based on dip angles stacking (Vp, Vs, P geological profile forecast);

8. Subsurface geologic imaging of the seismic attributes:

- conversion of the seismic sections into instantaneous amplitude sections, frequency, phase sections and sections of seismic trace derivatives and integrals;

9. Generation of seismic attribute maps and their editing subject to sedimentary reservoir model;

10. Seismic facies analysis:

- calculations of the sedimentary sections;

- calculations of the seismic facies sections;

- delineation of the seismic facies as the result of the integrated interpretation of the seismic, sedimentary and seismic facies sections;

- seismic facies analysis of the attribute sections;

- delineation of the paleodeltas, paleochannels, paleobars, barrier islands and so on;

- analysis and referencing of the seismic and logging facies;

- conjoint interpretation of the seismic facies and paleotectonic analyses in order to restore the conditions of the accumulation of the sand bodies - reservoirs, to determine their genesis, facies environments;

- determination of the correlative relationships between amplitudes (other attributes) and net thickness, average porosity;

- prospectivity assessment of the delineated sedimentary bodies as a result of determining the nature of reservoir saturation (charge) based on testing and geo-physical well logging;

- classification of the delineated seismic facies;

 

11. Analysis of the tectonic and paleo-structural development of the area:

- calculations of  sections of paleoenvironment history of horizons formation;

- analysis of the vertical cross sections of the paleoenvironment history by using random profiles;

- paleotectonic section imaging;

- paleotectonic cross sections analysis

- imaging and analysis of the paleo-structural level (horizon) plans.

- adjustment of the paleotectonic and seismic facies analyses;

12. Development of conceptual deposit model:

- sedimentary reservoir modeling based on the paleotectonic and facies analysis;

13. Geostatic analysis of the correlative relationships between seismic attributes and estimated parameters: net thicknesses and effective porosity ratios:

- evaluation of the correlative relationships between seismic attributes and reservoir thickness in process of one-dimensional modeling;

- finding out relationships between AVO- attributes and estimated parameters;

- separate establishment of relationships for various deposition settings;

- calculations of maps of the estimated parameters;

- comparison of the estimated parameters maps with the maps of the estimated extent of the sand bodies;

- confidence estimation of the estimated parameters prognosis;

14. Discovering and pre-drilling studies of the new structural and non-structural prospects (leads);

15. Issue of the recommendations for drilling new exploration (or producing) wells.

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