Sedimentological Analysis of TP1-TP5 Layers in the South Tambey Field Study Area, West Siberian Basin

The South Tambey field is a natural gas field located at the northern part of West Siberian Basin, on Yamal peninsula.

The main objective of this paper is to reconstruct depositional environment, and the main aim is creating integrated geological model of the field and showing sand bodies’- distribution within productive intervals.

TP1-TP5 are essentially composed of paralic sediments.

During the process of core description we managed to recognize 13 facies. This facies have formed 8 facies association, which have been defined from Open Marine, Paralic and Delta plain Facies associations. Sometimes different facies associations have a similar facial composition, the main difference between which is sediments’ regime.

This data has been analyzed in Techlog software with well logs’ and petrophysical data. Afterwards we recognized 8 electrofacies.

For generating facies’ map we used the following succession:

1. Core data analysis, especially facies association, as a most important criterion.
2. Well logs’ analysis, more specifically electrofacies data and correlation pattern with sand bodies’ distribution and sequence stratigraphy content.
   
   Electrofacies helped us to reconstruct paleoenvironment in the intervals, where core material wasn’t presented.
3. Seismic attribute analysis.
   
   Paleogeographic environments of TP1-TP5 have been confirmed.
   
   Maps with the most potential reservoirs have been created.