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Establishment and application of logging saturation interpretation equation in vuggy reservoirs

Abstract

Vuggy reservoirs are the most common, albeit important heterogeneous carbonate reservoirs in China. However, saturation calculations using logging data are not well developed, whereas Archie method is more common. In this study, electrical conduction in a vuggy reservoir is theoretically analyzed to establish a new saturation equation for vuggy reservoirs. We found that vugs have a greater effect on saturation than resistivity, which causes inflection in the rock-electricity curve. Using single-variable experiments, we evaluated the effects of vug size, vug number, and vug distribution on the rock-electricity relation. Based on the general saturation model, a saturation equation for vuggy reservoirs is derived, and the physical significance of the equation parameters is discussed based on the seepage-electricity similarity. The equation parameters depend on the pore structure, and vugs and matrix pore size distribution. Furthermore, a method for calculating the equation parameters is proposed, which uses nuclear magnetic resonance (NMR) data to calculate the capillary pressure curve. Field application of the proposed equation and parameter derivation method shows good match between calculated and experimental results, with an average absolute error of 5.8%.

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This work was supported by the National S&T Major Special Project (No. 2011ZX05020-008).

Sun Wen-Jie, graduated from China University of Petroleum (East China) in 2008 with a major in Petroleum Engineering. She is currently a Ph.D student in Peking University and the Research Institute of Petroleum Exploration and Development (RIPED), CNPC. Her research focuses on Experimental Rock Physics.

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Sun, WJ., Li, N., Wu, HL. et al. Establishment and application of logging saturation interpretation equation in vuggy reservoirs. Appl. Geophys. 11, 257–268 (2014). https://doi.org/10.1007/s11770-014-0438-0

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  • DOI: https://doi.org/10.1007/s11770-014-0438-0

Keywords

  • Vuggy reservoir
  • saturation
  • general solution saturation equation
  • capillary pressure
  • capillary pressure curve
  • NMR
  • rock electricity