Summary: Petroleum Systems And Regional Geology | MVO
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Read the summary and the most important questions on Petroleum systems and regional geology | MVO
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1 Charge
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Name four depositional environments for potential source rocks
1. Sapropels form due stratification --> high percipitation fresh water CLIMATE CONTROL2. Ocean Anoxic Events3. Big OMZ4. Transgrssive system tracts -
how to distinguish marine and terrestial source rocks
marine: high sulphur content terrestial: high conc. C7 napthenes and presence waxy peaks (C25), chemical fossils (oleanane trace of plant) -
What is a kerogen? and explain components
non soluble organic material; liptinite (Type I and II), vitrinite (type III) and inertinite (type IV) -
TOC of COAL is >50% dot they contain primarily vitrinite do they produce mainly gas or oil?
vitrinite primarly gas -
Quality source rock in...?Methods to characterise and analyse source rocks
SPI source potential index of immature SR HI, S1, S2, Tmax, maturity (vitrinite reflectance) -
Source rocks form in different settings, and not all source rocks are the same make diagram
• Type I: algal matter, lacustrine environments: prolific oil• Type II: marine source rocks: good oil & gas• Type III: terrestrial source rocks: mainly gas• Type IV: oxidised organic matter: poor source rock -
2 Reservoir
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Turbidites are often formed with a .... sealvl
low stand system tract -
Regression and transgression and stable sealvl
regression turbidites, stable seatvl --> rapid progradation --> slumping, -
Synsedimentray or growth faulting leads what reservoir?
coarse material in hanging wall -
3 Seals
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Seals break if buoyancy pressure is sufficient to allow hydrocarbons to enter and pass through water wet pores if they overcome capillary pressure which depends on
-hydrocarbon-water interfacial tension- the wettabillity- the radius of the largest pore-throats
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