OUR ACHIEVEMENTS
Contents:
- Examples of structure map validation through further drilling.
- Successful drilling of horizontal wells by predictions.
- Correction for near-surface heterogeneity effects.
- Creation of a regional seismic frame based on areal surveys.
- Archive data reprocessing.
- Alternate processing.
- Processing in complicated geoseismic conditions.
- Work in complicated geoseismic conditions.
Company Work Result
– High efficiency of oil & gas drilling.
Against the global average drilling success ratio 0.3-0.5, this index based on Purgeofizika LLC work results has reached 0.93
The Fields Discovered:
- Yuzhno-Tarasovskoe multi-layer oilfield (Rosneft)
- Itursko-Ituyakhskaya zone (Sibneft – Noyabrskneftegaz). 3 wells drilled there helped to discover oilfields
- Severo-Khancheiskoe gas condensate field (NOVATEK)
- Kutymskoe oil & gas condensate field (Gazprom)
- Vostochno-Kutymskoe oil & gas condensate field (Gazprom)
- Severo-Kutymskoe oil & gas condensate field (NOVATEK)
- Zapadno-Kutymskoe oil & gas condensate field (NOVATEK)
- Zapadno-Chaselskoe gas field (Kynsko-Chaselskoe Neftegaz LLC)
- 5 new fields in borders of Volga-Ural petroleum province.
Examples of Structure Map Validation Through Further Drilling
Samburgskoe field
After delivery of a Purgeofizika LLC report, more than 60 new wells were drilled.
The drilling revealed a high reliability level of the structural model created
Structural mapping error, Mistie distribution histogram for
calculated using new drilling BU10 reservoir top
drilled by a small number of wells
Vyngapurovskoe Field
With more than 2400 wells drilled in the area of study and based on Purgeofizika LLC recommendations, 5 exploration & appraisal wells were drilled within the delineated prospects. As a result, 34 new oil pools were discovered, 8 of which were found in the beds with no earlier established HC charge.
Structure map accuracy evaluation results based on new E&A wells drilled by Purgeofizika LLC recommendations:
Successful Drilling of Horizontal Wells By Predictions
One of the West-Siberian fields
Нeff Prediction Map
– Average BP16 reservoir oil flow rate in horizontal wells -10 t/day
– Oil flow rate in new 2-bottomhole well drilled using Purgeofizika LLC predictions -240 t/day
Conductivity Prediction Map Predicted Conductivity Data Cube Slice
Correction for Near-Surface Heterogeneity Effects
Yurkharovskoye Field
After adequate correction for the near-surface heterogeneity effects, field oil & gas reserves increased sixfold
At present, the field geological model is proved by well drilling in a transit zone
Creation of a Regional Seismic Frame Based On Areal Surveys
West Siberia
More than 4000 km of 1985-2006 lines were processed & reduced to the uniform frequency response characteristics, on the basis of which a network of composite lines was created.
A tie of seismic lines to 300 wildcat & exploratory wells was performed. Based on the results obtained, 40 new promising traps & zones were identified
East Siberia
More than 12,000 linear km were processed & reduced to the uniform frequency response characteristics.
By the results obtained, the potential oil & gas accumulation zones were delineated and recommendations on licensing of the unallocated subsoil-reserve fund areas were given.
Archive Data Reprocessing
Iraq
Initial data was handed over on paper carriers.
Paper-based section vectorization & post-stack seismic data processing were performed.
After reprocessing, the reflection-event tracking was considerably improved, thus allowing to delineate a lot of multi-type hydrocarbon traps
original cross-section processing & interpretation
made by Purgeofizika LLC
West Siberia
Archive data re-processing using state-of-the-art software & new technologies allowed to achieve substantial improvement of a dynamic expressiveness in a cross-section and expand spectral width of a seismic record, and therefore made it possible to get new geological information while performing interpretation of the data.
Earlier processing Purgeofizika LLC processing results
East Siberia. Regional Works
Archive data re-processing based on state-of-the-art software & new technologies
Alternate Processing
Congo-Senji
The incision-related effects distort a wave pattern & lead to errors in interpretation of lower horizons. After Purgeofizika LLC alternate processing there are no wave-pattern distortions seen on the section & the incision effects are removed.
Processing & interpretation of other company Purgeofizika LLC
processing & interpretation
Samara Region
The adequate near-surface correction allows to obtain more reliable structural maps and considerably reduce the exploration drilling risks.
Processing & interpretation of other company Purgeofizika LLC
processing & interpretation
Processing in Complicated Geoseismic Conditions
Timan-Pechora Basin
Reef Mapping
Thorough & accurate processing made it possible to achieve more reliable picking up of a reef seismic facies, which the primary HC search prospects relate to.
Work with Materials Obtained in Different Shot & Recording Conditions
Work in Complicated Geoseismic Conditions
One of the West-Siberian North Fields
In spite of exploration drilling maturity of the field, the existing geoseismic model of complex continental sediments of Tanopchinskaya formation remained unconfirmed by the wells drilled. Due to the simultaneous correlation of wells vs time sections, Purgeofizika LLC managed to create a reliable geoseismic model and explain reservoir geology, which further resulted in successful development well drilling.
