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Petrophysical Data Interpritation |
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It is common knowledge that oil and gas field development depends largely on reliable and timely interpretation of logging data providing unique initial information on deposits being penetrated.
It should be noted that accurate interpretation of log data is primarily based on the acquisition and in-depth analysis of core data without which fine-tuning of log interpretation methods is impossible. According to the data acquisition and study policy of SPD, core is recovered at each well pad in the fields being developed.
Each well should be characterised by favourable geological and core sampling conditions. Such strategy provides a uniform core data coverage of the field and the most thorough description of the different lithologies and facies. Application of SibBurMash coring technologies combined with Shell recommendations ensured 100% core recovery while maintaining the structure and, especially important, natural saturation of rock samples.
For a detailed study of petrophysical properties, in-depth core analysis is performed and includes:
• macro- and micro-description of the core;
• estimation of porosity, permeability and water saturation;
• specific measurements such as relative permeability, capillary data and electrical core analysis;
• mineral composition and grainsize analysis.
Assessment of spatial distribution of reservoir pressure during production is a separate objective. This information is valuable for field development optimization and, in the long term, for oil production enhancement. For this purpose, the reservoir pressure profile is determined in three to four wells at each pad using formation pressure testing. SPD is using Schlumberger’s state-of-the-art technology, the XPT sampler. Log interpretation techniques for thin and laminated reservoirs have been elaborated. For this purpose, a special technique was employed to improve the vertical resolution of the density log, which is the basic data for determining of reservoir porosity. In addition, a technique for assessing the amount of sand in laminated sand-shale intervals was developed and applied. As a result of using the above techniques, the quality of assessing porosity and net thickness in thin and heterogeneous reservoirs was improved significantly. Another important task is predicting the water content in wells being put on stream. For this purpose, a water-cut forecast method was developed which is based on the variation of rock porosity and oil saturation. The introduction of new petrophysical software has formed the basis for effective development and implementation of these technologies. “Logic” software package used for several decades was replaced in SPD.
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INFORMATION |
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Copyright © 2004 Salym Petroleum Development N. V.
// Russia, 31, Novinsky blvd, Moscow,
Tel.: +7 (495) 518-97-20,
Email: info@spdnv.ru |
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