# STAT2001 / STAT5008: Compute the Total Quantity of Petroleum Commercially: Mathematical Statistics Assignment, ANU, Australia

Subject | STAT2001 / STAT5008: Mathematical Statistics |

**OBJECTIVE**

Compute the total quantity of petroleum commercially recoverable from two fields.

**BACKGROUND INFORMATION**

Let X be a random variable, define π(alpha) as π[x> p(alpha)]=πΌ. For example, if π~π(200, 10^2), p0.9 is defined as π[x>p0.9]=0.9. A simple calculation will show that π0.9= 187.1845

In the petroleum industry, π0.9 is denoted as P90 and is considered as proved reserves value for practical purposes.

Let xa and πb be the quantity of petroleum commercially recoverable from field A and field B with the parameters defined as below

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**PART I**

(a) Compute ππππ¨ value for fields A defined as π[ππ¨ >ππππ¨]= 0.9

(b) Compute ππππ© value for fields B defined as π[ππ© >ππππ©]= 0.9

(c) Assuming fields A and B are independent, specify the distribution of πa+ πb and compute its parameter values. Compute ππππ¨+B, where π[ππ¨ + xB >ππππ¨]= 0.9.

(d) Assuming πa and πb have correlation π, Specify the distribution of πa + πb and compute its parameter values. Compute πππ a+b for various correlation values. Plot your results with a range of correlation values from (β1, 1) on the x-axis and corresponding values of ππππ¨+B on the y-axis. Compare the values of P90a+ P90b with that of ππππ¨+B.

**PART II**

(a) Explain how the feedback from part I is incorporated in this submission. Your submission will not be marked if you do not submit an answer to this question.

(b) An oil and gas company, PetroMath is thinking of purchasing both fields A and B. Based on the above results write a short report (max 100 words + figure) for the business manager of PetroMath providing useful information to help with a business decision.

(c) Research the terms βValueβatβRiskβ and βrisk diversificationβ. Explain how the above results apply in this context…

(d) Manager of PetroMath thinks that your assumption of normality may not be valid, however, the mean and variance may remain the same. It is anticipated that the distribution for fields A and B are logβnormal and gamma respectively. How would this assumption change the results? Write an update for the manager (max 50 words+ figure optional) to make sure you are highlighting the key differences in the new results.

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