Oil and gas prospecting tasks

SIGMA-GEO offers electrical exploration survey using the TEM method in 2D and 3D modifications to solve oil and gas exploration. The company's methods and technologies are successfully used at the largest oil and gas fields in Eastern and Western Siberia.

The relevance

When developing hydrocarbon deposits, at each stage of prospecting surveys, subsoil users face certain problems and risks, some of them:

  • The need to minimize the volume of expensive 2D and 3D seismic exploration work, designing in areas with a high probability of discovering oil and gas deposits.
  • Selection of locations for prospecting, parametric, and exploratory wells in conditions of high uncertainty of reservoir availability and type of its saturation.
  • The need to assess the mining and geological drilling conditions to minimize accidents during exploration and production drilling.
  • Selection of the optimal grid for cluster drilling of a field at the stage of creating a reservoir 
    development plan.

Solutions

3D model of the sedimentary cover according to 
3D TEM data

Electrical prospecting using the TEM method effectively copes with the tasks listed above in the case of rational application of the appropriate modifications of the method (2D, 3D) at each stage of geological exploration.

The main feature for identifying reservoir development zones is the contrast of their electrical resistance relative to the host deposits.

Prospecting indicators of hydrocarbon deposits according to TEM data in conditions of highly lithified terrigenous, carbonate-halogen deposits of the Vendian-Cambrian (Leno-Tunguska oil and gas shows) Prospecting indicators of hydrocarbon deposits according to TEM data in conditions ofMesozoic clayey deposits (West Siberian oil and gas shows, Leno-Vilyui oil and gas shows)

 

Statistical data accumulated over many years of work make it possible to predict not only the presence of reservoir horizons in the section, but also the type of their fluid saturation. Predictions made based on the results of electrical exploration works of the TEM have been repeatedly confirmed by drilling in many areas and license areas in Eastern and Western Siberia.

The effect of using TEM at each stage of exploration

The use of 2D TEM at the prospecting and evaluation stage of exploration ensures:

  • Reducing costs by optimizing the seismic exploration network in the case of advanced 2D electrical surveys.
  • Minimizing the risks of drilling “dry” prospecting and appraisal wells.

The use of 3D TEM at the exploration stage

  • Setting up a complex of 3D seismic and electrical surveys using a combined network of profiles will make it possible to assess reservoir properties and the type of saturation of reservoirs, minimize the risks of drilling “dry” wells, and also predict the intervals of probable ALRP and AHRP.

The use of 3D TEM at the operational stage 

  • Optimization of the technical scheme of field development by locating well clusters in the most optimal zones from the point of view of oil and gas content.

SIGMA-GEO experience 

  • Employees' experience in this area exceeds 20 yearsa.  
  • More than 45,000 physical observations (22,000 linear km) of the 2D TEM have been completed. 
  • More than 60,000 physical observations (12,000 linear km) of the 3D TEM have been completed.
  • Technologies for solving oil and gas prospecting problems based on the application of the TEM method have been tested in various climatic, geographical and geological conditions, the effectiveness of predictions has been repeatedly confirmed by drilling. 

Geography of work