Petroleum Geology an der Montanuniversität Leoben | Karteikarten & Zusammenfassungen

Lernmaterialien für Petroleum Geology an der Montanuniversität Leoben

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TESTE DEIN WISSEN

What maturity parameters related to bitumen are there?

Lösung anzeigen
TESTE DEIN WISSEN
  • CPI (Carbon Preference Index)
    immature, if high odd/even n-alkanes ratio
  • MPI-1
    change in chemical composition
    oil: increasing pattern
    gas: decreasing pattern
  • Biomarker ratios (Sterane isomerisation)
Lösung ausblenden
TESTE DEIN WISSEN

What happens after the drill cuttings are retrieved from the mud system?

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TESTE DEIN WISSEN

Split into:

  • bulk, unwashed wet-cut samples (cloth bags)
  • washed and sieved dry-cut samples (paper bags)
    examined wet under microscope
Lösung ausblenden
TESTE DEIN WISSEN

What processes can cause overpressure?

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TESTE DEIN WISSEN

loading (disequilibrium compaction, tectonic compression)

unloading (influx of pore fluid, conversion of solid material into fluid)

Lösung ausblenden
TESTE DEIN WISSEN

What levels of certainty exist?

What are they controlled by?

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TESTE DEIN WISSEN

(!) known – oil/gas to source rock correlation (biomarker studies)

(.) hypothetical – geochemical evidence

(?) speculative – geophysical evidence

Lösung ausblenden
TESTE DEIN WISSEN

Explain the marine silled basin depositional systems for SR?

Name a regional example.

Lösung anzeigen
TESTE DEIN WISSEN

Silled basin:

- restricted water exchange => water + saline stratification

- humid: oil-gas

- arid: oil

- Toarcian black shales, Tyrol

Lösung ausblenden
TESTE DEIN WISSEN

What is a favorable factor against H2S formation?

Lösung anzeigen
TESTE DEIN WISSEN

Fe -> Pyrite

enough in Si

limiting factor in Carbs

Lösung ausblenden
TESTE DEIN WISSEN

How is the heat flow defined?

What has big influence on thermal conductivity?

How does the geothermal gradient change with depth?

So what are the main sources of heat flow?

Lösung anzeigen
TESTE DEIN WISSEN

q=k*(ΔT/Δx)

increases with depth and decreases with porosity.

decreases with depth.

conduction (solid) and convection (fluid)

Lösung ausblenden
TESTE DEIN WISSEN

In what settings does overpressure mainly occur and how can it change?

Lösung anzeigen
TESTE DEIN WISSEN

Young basins with high sedimentation rates. Later equilibrium when sed. rate decreases (correlation to top of OP).

Lösung ausblenden
TESTE DEIN WISSEN

What are underpressure generating processes?

Lösung anzeigen
TESTE DEIN WISSEN

Reservoir depletion due to HC production.

Low permeable recharge area compared to discharge area.

Lösung ausblenden
TESTE DEIN WISSEN

What does the petroleum events chart show?

When would the HC system not work?

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TESTE DEIN WISSEN

relates elements and processes to trap timing.

If the reservoir formation was shifted so it happend after the critical moment.

Lösung ausblenden
TESTE DEIN WISSEN

What is principal of permeability measurement?

How is measured?

What does it directly control?

What influence has the sample consolidation? How is the result most realistic?

Lösung anzeigen
TESTE DEIN WISSEN

Resistance of sample against air flow.

Perpendicular and parallel to bedding.

Fluid production rate and economical amount of wells per reservoir.

unconsolidated samples make unaccurate measurements.

Confining pressure close to insitu stress.

Lösung ausblenden
TESTE DEIN WISSEN

What determines wettability?

What does the wettability strongly influence?

Lösung anzeigen
TESTE DEIN WISSEN

contact angle </> 90° (high/low)

adhesion >/< cohesion (high/low)

influences producibility strongly, better if high water wettability

Lösung ausblenden
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Q:

What maturity parameters related to bitumen are there?

A:
  • CPI (Carbon Preference Index)
    immature, if high odd/even n-alkanes ratio
  • MPI-1
    change in chemical composition
    oil: increasing pattern
    gas: decreasing pattern
  • Biomarker ratios (Sterane isomerisation)
Q:

What happens after the drill cuttings are retrieved from the mud system?

A:

Split into:

  • bulk, unwashed wet-cut samples (cloth bags)
  • washed and sieved dry-cut samples (paper bags)
    examined wet under microscope
Q:

What processes can cause overpressure?

A:

loading (disequilibrium compaction, tectonic compression)

unloading (influx of pore fluid, conversion of solid material into fluid)

Q:

What levels of certainty exist?

What are they controlled by?

A:

(!) known – oil/gas to source rock correlation (biomarker studies)

(.) hypothetical – geochemical evidence

(?) speculative – geophysical evidence

Q:

Explain the marine silled basin depositional systems for SR?

Name a regional example.

A:

Silled basin:

- restricted water exchange => water + saline stratification

- humid: oil-gas

- arid: oil

- Toarcian black shales, Tyrol

Mehr Karteikarten anzeigen
Q:

What is a favorable factor against H2S formation?

A:

Fe -> Pyrite

enough in Si

limiting factor in Carbs

Q:

How is the heat flow defined?

What has big influence on thermal conductivity?

How does the geothermal gradient change with depth?

So what are the main sources of heat flow?

A:

q=k*(ΔT/Δx)

increases with depth and decreases with porosity.

decreases with depth.

conduction (solid) and convection (fluid)

Q:

In what settings does overpressure mainly occur and how can it change?

A:

Young basins with high sedimentation rates. Later equilibrium when sed. rate decreases (correlation to top of OP).

Q:

What are underpressure generating processes?

A:

Reservoir depletion due to HC production.

Low permeable recharge area compared to discharge area.

Q:

What does the petroleum events chart show?

When would the HC system not work?

A:

relates elements and processes to trap timing.

If the reservoir formation was shifted so it happend after the critical moment.

Q:

What is principal of permeability measurement?

How is measured?

What does it directly control?

What influence has the sample consolidation? How is the result most realistic?

A:

Resistance of sample against air flow.

Perpendicular and parallel to bedding.

Fluid production rate and economical amount of wells per reservoir.

unconsolidated samples make unaccurate measurements.

Confining pressure close to insitu stress.

Q:

What determines wettability?

What does the wettability strongly influence?

A:

contact angle </> 90° (high/low)

adhesion >/< cohesion (high/low)

influences producibility strongly, better if high water wettability

Petroleum Geology

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