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Explore the Oil Industry: The Geology Case

Dive into the world of oil industry exploration with this fascinating geology case study. Calculate reserves, STOIIP, and more while utilizing seismic profiles and well data. Learn about key factors affecting recovery and explore the process step by step. Take on the challenge and unleash your inner oil industry expert.

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Explore the Oil Industry: The Geology Case

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  1. MÆRSK OLIE OG GAS AS – GYMNASIE OPGAVE - 2008

  2. Velkommen til olie industrien – MAERSK OLIE OG GAS AS Se den positive side! I 2008 vil din rådne krop koste 11 kr. literen på tanken! Oooooohh…! Jeg kan se, at du har en vigtig rolle, at spille i olie industrien!

  3. The Geology Case – now it is your turn! MY OWN LITTLE OILFIELD THE MOLO FIELD OPGAVE OPGAVE – beregn olie mængden i et reservoir

  4. Gross Rock Volume is: Volume of rock containing our reservoir STOIIP (Stock Tank Oil Initially In Place) or GIIP (Gas Initially In Place) is: Amount of hydrocarbons present in our reservoir RESERVES are: Hydrocarbons we can produce (given present conditions) OPGAVE – Baggrundsinformation 1

  5. Recovery Factor is depending on: Reservoir Quality & Conditions Oil and Gas Type Number of Production Wells and Type (Cost) Production Method (Enhanced Recovery) OPGAVE – Baggrundsinformation 2 RESERVES = [STOIIP] · [Recovery Factor]

  6. OPGAVE – Baggrundsinformation 3 • YOUR FACTS: • We have 2 seismic profiles across the reservoir • The MOLO-1 well penetrated the top of the reservoir at a depth of XXXX feet • An oil-water contact was found in MOLO-1 at a depth of XXXX feet • The average porosity (Φ) was found to be 0.XXX (XX.X vol.%) • The penetrated reservoir is reduced by interspaced non-reservoir rock → N/G ratio of 0.90 (90 vol.%) • The average water saturation (Sw) is 0.XX (XX vol.%) • The Formation Volume Factor (FVF) is 1.2 (the reduction in oil volume due to loss of gas content when moving from reservoir pressure and temperature to surface conditions) • The Recovery Factor (RF) is estimated to be 0.25 (i.e. 25 % of the STOIIP will be produced to surface).

  7. OPGAVE: My Own Little Oilfield 1 • YOUR TASK: • Calculate the Gross Rock Volume (GRV) • Calculate Stock Tank Oil Initially In Place (STOIIP) • Calculate the Reserves

  8. NORTH MOLO-1 well SOUTH OPGAVE: My Own Little Oilfield 2 WEST EAST Seismic Profiles

  9. OPGAVE: My Own Little Oilfield 3 NOTE – feet! MOLO-1 well feet 5700 6000 6300 6600 6900 7200 7500 7800 Top of Reservoir Oil-Water Contact / Transition Zone 1000 NOTE – meter!

  10. OPGAVE: My Own Little Oilfield 4 MOLO-1 A wireline log showing the porosity and hydrocarbon saturation profile from the well Approximately 180 ft of chalk oil-reservoir h 60 meters

  11. OPGAVE: My Own Little Oilfield 5 Apply a known geometrical shape to the reservoir shape: The Spherical Cap h α

  12. α h 0 OPGAVE: My Own Little Oilfield 6 Gross Rock Volume is then the volume of a spherical cap with a height ofhand a radius ofα his estimated using the log from the well – You then findαfrom the seismic profiles Calculate GRV from this expression (expect a large number!): GRV = 1/6·π·h·(3·α²+h²)

  13. Gross Rock Volume (GRV) Net to Gross (N/G) Porosity (Φ) Oil Saturation (Soil equal to 1 minus Water Saturation Sw) Oil Formation Volume Factor (FVF given as a value of 2) OPGAVE: My Own Little Oilfield 7 Calculate STOIIP using this expression (the unit at this stage is m3): STOIIP = GRV ∙ N/G ∙ Φ ∙ Soil / FVF

  14. OPGAVE: My Own Little Oilfield 8 We now re-calculate STOIIP in m3 to STOIIP in million bbls using this expression: STOIIPmillion bbls= STOIIPm3 ∙ 6.29 / 1,000,000 Finally the reserves are calculated given a recovery factor of 0.25 (25%): Reserves = STOIIPmillion bbls ∙ RF

  15. OPGAVE: My Own Little Oilfield 9 – Excel regneark til beregning

  16. The End MÆRSK OLIE OG GAS AS How can I learn more? http://www.maerskoil.com

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