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The Impact of Reservoir Heterogeneities on P-wave Propagation at Low Frequencies — Examples from the North Sea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
The goal of this study is to evaluate the low frequency effects observed below some reservoirs in the North Sea. Three reservoir models were built based on the well logs from those reservoirs. Seismic P-wave modeling was performed on the reservoirs using an asymptotic solution to Biot’s media at different frequencies. In this case, the seismic P-wave response from a reservoir zone consists of two main components: the response due to the main P-wave reflections from the reservoir top and bottom, and the response due to converted P-waves reflected from the heterogeneities within the reservoir zone. Both solid matrix and fluid contents vary through the reservoir zone. Hence, they contribute to the generation of converted P-waves. The results of the modeling show that the heterogeneities within reservoir zones may affect seismic P-wave responses from such a reservoir. The study results show that the impact of reservoir heterogeneous nature is most pronounced at low seismic frequencies (around 5 Hz). In this case, the seismic traces from a naturally fractured highly heterogeneous reservoir model are most distinguishable from their homogeneous analogues.