PETE311_06A_Class02_(Maggard)

PETE311_06A_Class02_(Maggard) - POROSITY Many slides...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
POROSITY Many slides contain more detailed notes that may be shown using the “Notes Page View”
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Acknowledgments • Dr. Walt Ayers, PETE 311, Fall 2001 NExT PERF Short Course Notes, 1999 – Note that many of the NExT slides appears to have been obtained from other primary sources that are not cited
Background image of page 2
Definition : Porosity is the fraction of the bulk volume of a material (rock) that is occupied by pores (voids ). Discussion Topics • Origins and descriptions • Factors that effect porosity • Methods of determination RESERVOIR POROSITY
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ROCK MATRIX AND PORE SPACE Rock matrix Pore space Note different use of “matrix” by geologists and engineers
Background image of page 4
Porosity : The fraction of the bulk volume of a rock that is occupied by pores b ma b b p V V V V V Porosity = = φ = POROSITY DEFINITION • Porosity is an intensive property describing the fluid storage capacity of rock
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ROCK MATRIX AND PORE SPACE Rock matrix Water Oil and/or gas
Background image of page 6
OBJECTIVES To provide an understanding of • The concepts of rock matrix and porosity • The difference between original (primary) and induced (secondary) porosity • The difference between total and effective porosity • Laboratory methods of porosity determination • Determination of porosity from well logs
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CLASSIFICATION OF ROCKS SEDIMENTARY Rock-forming process Source of material IGNEOUS METAMORPHIC Molten materials in deep crust and upper mantle Crystallization (Solidification of melt) Weathering and erosion of rocks exposed at surface Sedimentation, burial and lithification Rocks under high temperatures and pressures in deep crust Recrystallization due to heat, pressure, or chemically active fluids
Background image of page 8
SEDIMENTARY ROCKS Clastics Carbonates Evaporites
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CLASTIC AND CARBONATE ROCKS Clastic Rocks Consist Primarily of Silicate Minerals Are Classified on the Basis of: -Gra inS ize - Mineral Composition Carbonate Rocks Consist Primarily of Carbonate Minerals (i.e. Minerals With a CO Anion Group) Limestone - Predominately Calcite (Calcium Carbonate, CaCO 3 ) Dolomite - Predominately Dolostone (Calcium Magnesium Carbonate, CaMg(CO 3 ) 2 ) 3 -2
Background image of page 10
Relative Abundances Siltstone and shale (clastic) ~75% Sandstone and conglomerate (clastic) ~11% Limestone and dolomite ~14% SEDIMENTARY ROCK TYPES,
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sand Grains Clay Matrix Chemical Cement Quartz Feldspar Rock Fragments Quartz Calcite Hematite Illite Kaolinite Smectite Average Sandstone Average Mudrock (Shale) Allochemical Grains Chemical Cement Microcrystalline Matrix Calcite Fossils Pelloids Oolites Intractlasts Calcite Average Sparry Limestone Average Micritic Limestone Clastic Rocks Carbonate Rocks Comparison of Compositions of Clastic and Carbonate Rocks
Background image of page 12
Grain-Size Classification for Clastic Sediments Name Millimeters Micrometers Boulder Cobble Pebble Granule Very Coarse Sand Coarse Sand Medium Sand Fine Sand Very Fine Sand Coarse Silt Medium Silt Fine Silt Very Fine Silt Clay 4,096 256 64 4 2 1 0.5 0.25 0.125 0.062 0.031 0.016 0.008 0.004 500 250 125 62 31 16 8 4 (modified from Blatt, 1982)
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Average Detrital Mineral Composition of Shale and Sandstone Mineral Composition Shale Sandstone
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/03/2009 for the course PETE 311 taught by Professor Staff during the Spring '08 term at Texas A&M.

Page1 / 74

PETE311_06A_Class02_(Maggard) - POROSITY Many slides...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online