Petroleum Science >2011, Issue 4: 394-405 DOI: https://doi.org/10.1007/s12182-011-0157-6
The influence of pore structure on P- & S-wave velocities in complex carbonate reservoirs withsecondary storage space Open Access
文章信息
Laboratory for Integration of Geology & Geophysics, China University of Petroleum, Beijing 102249, China;Laboratory for Integration of Geology & Geophysics, China University of Petroleum, Beijing 102249, China;Research Institute of Exploration & Development, PetroChina Tarim Oilfi eld Company, Korla, Xinjiang 841000, China;Research Institute of Exploration & Development, PetroChina Tarim Oilfi eld Company, Korla, Xinjiang 841000, China;Research Institute of Exploration & Development, PetroChina Tarim Oilfi eld Company, Korla, Xinjiang 841000, China;Laboratory for Integration of Geology & Geophysics, China University of Petroleum, Beijing 102249, China
文章摘要
how the secondary storage space shape influences the P- & S-wave velocities (or elastic properties)
in complex carbonate reservoirs. In this paper, three classical rock physics models (Wyllie timeaverage equation, Gassmann equation and the Kuster-Toks?z model) are comparably analyzed for their construction principles and actual velocity prediction results, aiming at determining the most favourable rock physics model to consider the influence of secondary storage space shape. Then relationships between the P- & S-wave velocities in carbonate reservoirs and geometric shapes of secondary storage spaces are discussed from different aspects based on actual well data by employing the favourable rock physics model. To explain the influence of secondary storage space shape on VP-VS relationship, it is analyzed for the differences of S-wave velocities between derived from common empirical relationships (including Castagna’s mud rock line and Greenberg-Castagna VP-VS relationship) and predicted by the rock physics model. We advocate that VP-VS relationship for complex carbonate reservoirs should be built for different storage space types. For the carbonate reservoirs in the Tarim Basin, the VP-VS relationships for fractured, fractured-cavernous, and fractured-hole-vuggy reservoirs are respectively built on the basis of velocity prediction and secondary storage space type determination. Through the discussion above, it is expected that the velocity prediction and the VP-VS relationships for complex carbonate reservoirs should fully consider the influence of secondary storage space shape, thus providing more reasonable constraints for prestack inversion, further building a foundation for realizing carbonate reservoir prediction and fluid prediction.
关键词
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Complex carbonate reservoir, secondary storage space, velocity prediction, VP-VS relationships