Prediction of Oil-Productivity of Fractured Clay Reservoirs by Seismic Data

The study of fractured reservoirs clay using seismic data is a complex task. Modern applications (Multi-Wave Seismic, Tectonophysical Modeling, PRONY-Filtering) do not predict the oil-productivity directly, but simply engaged in mapping of fracture zones. In the fractured clay reservoirs a large heterogeneity of clay deposits means the formation of fractured zones. These zones represent potential reservoirs of oil with increased productivity. To estimate it authors proposed to use the Capacitive Differentiation Factor (CDF). CDF is the ratio of the total productive capacity of fractured reservoirs clay to the total capacity of reservoirs, which have the capacity in two and more times higher than the average capacity of the target interval. In the innovative technology of spectral-velocity prediction (SVP-technology) the method of prediction of oil-productivity of fracture clay reservoirs is implemented. The Spectral-Time Attributes are well correlated with the CDF and the CDF - with the oil-productivity. The described method was tested for studying the Bazhen deposits in Western Siberia. The described method for predicting of fracture oil-productivity clay collectors on the basis of Spectral-Time Analysis of the seismic record is innovative and has high confirmability of subsequent drilling.