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Petrophysics
Digitizing
- Digitizing and visualization of paper well log curves from old well
- Digitizing of mud and gas logging data, core descriptions, core analysis results, signs of hydrocarbon in core and cuttings, presence of carbonate differences (calcite, dolomite), luminescence-bitumen analysis data, evidence of presence of fractures and any other text information for visualization on final well charts.
- transfer of information from graphical formats into LAS, TXT, XLS formats for further load into interpretation software
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Use core analysis data for calibration of the CPI results and for Reserves Reports
- Core- well logs depth matching
![](https://www.reservoir.kz/wp-content/uploads/2024/02/image-88.png)
- Definition of cut-off values for porosity, clay content, saturation for each stratigraphic unit with account for lithology of reservoirs
![](https://www.reservoir.kz/wp-content/uploads/2024/02/Snimok-28.png)
Analysis of clay mineral composition, fractional composition, etc
![](https://www.reservoir.kz/wp-content/uploads/2024/02/image-87.png)
Gas logging
Gas log curves are analyzed for evaluation of reservoir fluid composition in course of drilling or during well logs interpretation to identify gas-saturated reservoirs. In RES several approaches for identification of gas-saturated or high-gas-factor reservoirs are being used:
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CPI
- Well logs normalization
- Lithology interpretation
- Identification of reservoir intervals
- 4. Reservoir properties – porosity, clay content, saturation
- Reservoir fluid type and hydrocarbon saturation
- Recommendations for well testing (openhole and cased)
![](https://www.reservoir.kz/wp-content/uploads/2024/02/image-84.png)
Well correlation
- Identification of reference horizons, their TD and thicknesses in different wells
- Tracing the change in thickness of stratigraphic subdivisions from well to well in the studied area
- Visual representation of changes in the thickness of productive horizons
- Visual representation of regional stratigraphic variability
- Tracing the changes in fluid contact in various blocks – WOC, GWC, GOC.
Well correlation is performed in the IP software package; additionally, cyclic and sequential sedimentation is analyzed using the Cyclolog software package.
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PLT
Allows to analyze the movement of contacts as the productions progresses for identifying working reservoir intervals , well casing damages and the flows behind the casing.
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Reserves calculation
- Systematization, analysis and generalization of well logs data
- Systematization, analysis and generalization of core data
- Systematization, analysis and generalization of well tests and production processes
- Identification of oil-saturated intervals
- Determination of porosity, clay content and saturation parameters
- Use of unified approach to the CPI for all wells in the field
- Block structure confirmation
- Calculation of porosity and saturation averaged values
- Building WOC, GWC, GOC charts
- Reserves calculation
- Drafting the reserves report
- Presentation and approval of reserves reports to the State Committee on Reserves
Unified approach to CPI for all wells in the field
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Software
- NeuroLog (USA) – for well log digitizing
- LogTools (Russia) – for CPI of Russian and Foreign log data
- Interactive Petrophysics – Lloyd’s Register Digital Products Limited – for CPI of Russian and Foreign log data