Estimated Ultimate Recovery is the sum of Cumulative Production plus . HE) & Probabilistic (P90%, P50% &. P10%). – PR should be risked for probability of. P50 (and P90, Mean, Expected and P10) When probabilistic Monte Carlo type For example, if we decide to go for a probability of exceedance curve, when we. Cooper Energy Investor Series Cumulative Probability – P90, P50, P10 The terms P90, P50 and P10 are occasionally used by persons when.

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Weather changes year-by-year, in longer-term cycles and has also stochastic nature. An example of its use in the oil and gas industry is the estimation of potential lifecycle i.

Is the P90 estimate or the P50 estimate more likely to prpbability

The log of a set of data that follows a log cuumulative distribution follows a normal distribution. The Monte Carlo method can make use of these distributions to arrive at an overall cumulative probability distribution overall uncertainty for EUR. Under the deterministic incremental risk-based approach, quantities at each level of uncertainty are estimated discretely and separately see Category Definitions and Guidelines, section 2.

I remember my statistics lecturer saying cumulatlve the P50 was the same for 1rs, 5yr or 10yr.

In other words, the values sampled in one distribution are correlated to the values sampled in another distribution, given the correlation coefficients between the two samples. Why are they so important? Aug 22, at 1: The first value for the Probability of exceedance and the last value for the Probability of Non-exceedance will always be equal to the total for all observations, since all frequencies will already have been added to the previous total.

For valid characterization of probabilitj term climate patterns, solar resource and meteorological data representing at least 10 years is required. Once you have pulled all the leaves off the tree the cups or bins to use the correct statistical term will look like the picture below: This uncertainty cannot be directly modeled using analytical solutions.


The large amount of data produced by statistical methods sometimes make it difficult to effectively use its results in the decision-making process. Figure 4 looks smoother than Figure 3 because Figure 4 was created from the smooth continuous distribution in Figure 1. Is a year P50 value the median cumulative energy produced over a year period and to get to an annual energy output estimate you would simply divide that number by 10?

While conceptually very simple, a trivial example provides the easiest route to developing an understanding of the Monte Carlo simulation procedure. Valor energtico total e contribuio percentual de Trend Reserve Distribution P90 2,, P50 27,, This is what is called the probability of exceedance.

It is quite common to see the uncertainty expressed in terms of standard deviation STDEVwhich represents a confidence interval equivalent to approximately You cant, its a single best estimate.

INC uses a slightly less accurate algorithm, but it works for any value of k between 0 and 1. Normal Distribution f x,0,1 Are you a solar industry expert? Simulation run using Solargis methodologies, considering a 1 kWp system with cSi technology, inverter efficiency The chance of a single estimate occurring can be read off Figure 1.

P50, P75, P90 and P99 value represented in a normal distribution. I had to explain that once for the project manager and the client and was hard to make them understand it. Lacking a smooth distribution necessitates re-running the simulation with a larger number of passes.

How to calculate P90 (or other Pxx) PV energy yield estimates

Figure 1 is known as a continuous distribution the line flows cumularive think of it as a distribution with a very large number of bins. Jun 20, at 6: After the stratified sampling is performed on all variables, the samples are randomly grouped together to generate the parameters to be entered into the model for each simulation pass. This is NOT the same as the chance of that estimate occurring.


However, when repeated a large number of times, a cumulative distribution for the EUR emerges.

Cumulative Probability P90 P50 P10 2

Probagility P10, P50 and P90 are useful parameters to understand how the numbers are distributed probabilith a cumulaive. Generally, enough runs are needed to ensure that the entire domain of input variables is examined. Expect the values of these parameters to vary slightly with each simulation. If we ask the question a different way: The deterministic approach would simply multiply the “best estimate” for each of these quantities to obtain a single value of EUR.

Dec 23, at 9: I cant remember the conceptual explanation. Another useful notion refers to the first and last value of these distributions. Production values for the first year of operation, no degradation factor considered in the calculations. It is a common misunderstanding that the P50 is a synonym of mean.

Terminology Explained: P10, P50 and P90 – DNV GL – Software

Consider the following sample list of observations. Cmuulative distributions where the values tend to be skewed, the mode, P50, and the mean begin to diverge. Rock volume, porosity and oil saturation are measureable things. Factors of uncertainty considered in photovoltaic energy calculation The calculation of Pxx scenarios from the P50 estimate takes into account the total uncertainty that summarizes all factors involved in the PV energy yield modelling.

You go to university for years and become a geophysicist, geologist, petrophysicist or reservoir engineer, you get a good job with an oil and gas company, you get trained over years, you gain a lot of experience and knowledge in earth sciences and the physics of oil and gas moving through rocks and then you get to work on interesting things like estimating recoverable oil and gas.