When rock physics models are established and calibrated they become powerful exploration tools in predicting fluid type ahead of the bit. Most commonly amplitude analysis for fluids is compared with the structural configuration of the trap, and correlation between fluid amplitude and structure is expected. If the structure is “full to spill” then the amplitudes will also correlate with the closing contour of the structure as determined by structural spill point. Conversely, in hydrodynamic systems the conformity is not only with structural definition of the trap but also the hydrodynamic spill point. Fluid contacts cross-cut structural contours, especially in oil accumulations. Recognition of hydrodynamic systems is therefore key to knowing when it is appropriate to use structure contours and spill point as criteria for amplitudes as fluid indicators.


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