Oil-water recognition based on diffusive-viscous wave equation
Hu Junhui1,2, Wen Xiaotao1, Xu Yanqiu3, Wang Wenhua1, Du Zhengcong3
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
2. Changqing Branch, BGP Inc, CNPC, Xi'an, Shaanxi 710018, China;
3. Panzhihua College, Panzhihua, Sichuan 617000, China
Abstract：Seismic characteristics of oil-saturated and water-saturated reservoirs are less different in the time-space domain, but they are much more different in the frequency domain. This phenomenon means frequency attributes are more sensitive to seismic attenuation in fluid detection. We propose an approach for oil-water recognition based on the theory of viscous-dispersive wave equation. This approach detects fluid by analyzing dominant frequency difference, frequency bandwidth difference and spectrum correlation of reservoir. According to model experiment and real data analysis, the following observations are obtained: ① Oil-saturated reservoir has higher dominant frequency difference, larger frequency bandwidth difference, and lower spectrum correlation, while water-saturated reservoir has opposite characteristics; ② Conventional fluid detections with larger workload have difficulties in parameter extraction and low sensitivity to the difference between oil- and water-saturated; ③ The proposed approach can effectively detect fluid and accurately recognize oil and water.
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