Histogram equations technique

This equation provides a prescription for calculating AA. The probability distribution function, P(A), for the range of A comprised between A0 and A is obtained from computer simulations, usually as a histogram. The ratio P /Po is then estimated. This generic idea has been implemented in various, creative ways, yielding a class of techniques called probability distribution or histogram methods. These methods are discussed in Chap. 3. 

Fig. 14. Histograms of the Pio, P50 and P90 gas volumes computed with the conventional reservoir engineering (equation (14)) and mass balance (equation (13)) techniques for exploration prospect number one.

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