Complex Carbonate Reservoir Characterization Based on Synchrosqueezing Wavelet Transform

Abstract

Complex carbonate reservoirs in Tarim Basin are enriched with abundant hydrocarbon resources, which is extremely appealing for industry. Nevertheless, our target Cambrian-Ordovician carbonate reservoirs are usually buried deeply (generally more than 6000 meters) with strong later diagenesis, strong heterogeneity and anisotropy, complex hydrocarbon accumulation periods and complicated oil-gas-water distribution. All these issues make it a world-class challenge for complex carbonate reservoir characterization. Time-frequency (TF) analysis has been widely used in seismic data interpretation and reservoir characterization. The local frequency variation of seismic data with high resolution in both time and frequency can be captured by the synchrosqueezing wavelet transform (SSWT). Thus, in this paper we for the first time utilize a physical model to demonstrate the superior performance of SSWT. We then introduce a novel application of SSWT on a deep complex carbonate reservoir. The application of SSWT is compared with commonly-used continuous wavelet transform (CWT), which indicates significant potential of SSWT for better characterizing complex carbonate reservoirs via the more obvious low-frequency anomalies. Four production wells also demonstrate the validity of SSWT. We expect that SSWT will be taken fully consideration for further large-scale applications in industry, which are especially beneficial to complex carbonate reservoir characterization.