Carbonate Reservoir Rocks Quiz

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Questions and Answers

What are the three most common carbonate minerals mentioned in the text?

  • Quartz, Feldspar, Mica
  • Calcite, Aragonite, Dolomite (correct)
  • Hematite, Magnetite, Limonite
  • Halite, Gypsum, Anhydrite

Which mineral is primarily associated with ooids?

  • Gypsum
  • Quartz
  • Feldspar
  • Aragonite (correct)

What is the primary texture associated with microcrystalline calcite?

  • Clay minerals
  • Sparry calcite
  • Ooids
  • Micrite (correct)

What are the two main origins of sparry calcite (spar)?

<p>Precipitation of secondary calcite in voids and recrystallization of fossil calcite (C)</p> Signup and view all the answers

What is the primary difference between limestones and dolomites?

<p>Composition: limestones are primarily composed of CaCO3, while dolomites contain CaMg(CO3)2. (B)</p> Signup and view all the answers

What are the two main types of carbonate grains mentioned in the text?

<p>Clasts and skeletal particles (C)</p> Signup and view all the answers

What size particles are associated with microcrystalline calcite (micrite)?

<p>Clay size or smaller particles (C)</p> Signup and view all the answers

Which classification system divides carbonates into Mudstones, Wackestones, Packstones, Grainstones, and Boundstones?

<p>R.J. Dunham System (C)</p> Signup and view all the answers

In the Dunham System, what type of rocks contain grains brought in from elsewhere?

<p>Allochemical rocks (C)</p> Signup and view all the answers

What type of porosity is typical of dolomites?

<p>Intercrystalline porosity (B)</p> Signup and view all the answers

Which classification emphasizes the effects of interparticle and vuggy porosity on reservoir petrophysical characteristics?

<p>Lucia's (1983) Classification (A)</p> Signup and view all the answers

Which classification system helps identify, correlate, and map rock/stratigraphic attributes that covary with genetic porosity?

<p>Ahr's (2008) Classification (A)</p> Signup and view all the answers

'How do I predict spatial distribution of these pore types' is a concern addressed by which classification system?

<p>'Ahr's (2008) Classification' (A)</p> Signup and view all the answers

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Study Notes

Carbonate Minerals

  • The three most common carbonate minerals are not specified in the text.

Carbonate Textures

  • Ooids are primarily associated with the mineral calcite.
  • Microcrystalline calcite is characterized by a micritic texture.
  • Microcrystalline calcite (micrite) is composed of particles smaller than 4 μm.

Sparry Calcite

  • Sparry calcite (spar) has two main origins: in situ precipitation and replacement of pre-existing minerals.

Limestones and Dolomites

  • The primary difference between limestones and dolomites is their mineral composition: limestones are composed of calcite, while dolomites are composed of dolomite.

Carbonate Grains

  • The two main types of carbonate grains are ooids and intraclasts.

Classification Systems

  • The Dunham System classifies carbonates into Mudstones, Wackestones, Packstones, Grainstones, and Boundstones.
  • In the Dunham System, Grainstones contain grains brought in from elsewhere.
  • The Rock-Fabric Petrophysical Classification emphasizes the effects of interparticle and vuggy porosity on reservoir petrophysical characteristics.
  • The Lucia Classification helps identify, correlate, and map rock/stratigraphic attributes that covary with genetic porosity, and addresses the concern of predicting the spatial distribution of pore types.
  • Dolomites typically exhibit moldic porosity.

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