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Establishment and application of logging saturation interpretation equation in vuggy reservoirs |
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| Authors: | Wen-Jie Sun Ning Li Hong-Liang Wu Ke-Wen Wang Gong Zhang |
| Institution: | 1. Research Institute of Petroleum Exploration & Development, CNPC, Beijing, 100083, China 2. School of Earth and Space Sciences, Peking University, Beijing, 100871, China 3. Yangtze University, Wuhan, 434023, China |
| 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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