Changes

==Density log==

==Density log==

The [[Basic open hole tools#Density|density log]] measures the electron density of a formation. The logging device is a contact tool that emits gamma rays from a source. Emitted gamma rays collide with formation electrons and scatter. A detector, located a fixed distance from the tool source, counts the number of returning gamma rays. The number of returning gamma rays is an indicator of formation bulk density. The litho-density tool (LDT) also provides a photoelectron (P_e) cross section curve, an independent indicator of lithology.

The [[Basic open hole tools#Density|density log]] measures the electron density of a formation. The logging device is a contact tool that emits gamma rays from a source. Emitted gamma rays collide with formation electrons and scatter. A detector, located a fixed distance from the tool source, counts the number of returning gamma rays. The number of returning gamma rays is an indicator of formation bulk density. The litho-density tool (LDT) also provides a photoelectron (P_e) [[cross section]] curve, an independent indicator of lithology.

==Obtaining porosities from a density log==

==Obtaining porosities from a density log==

| Sandstone || 2.65 || 1.8

| Sandstone || 2.65 || 1.8

|-

|-

| Limestone || 2.71 || 4.8

| [[Limestone]] || 2.71 || 4.8

|-

|-

| Dolomite || 2.876 || 3.0

| [[Dolomite]] || 2.876 || 3.0

|-

|-

| Anhydrite || 2.977 || 5.05

| [[Anhydrite]] || 2.977 || 5.05

|-

|-

| Salt || 2.032 || 4.6

| Salt || 2.032 || 4.6

[[Category:Predicting reservoir system quality and performance]]

[[Category:Predicting reservoir system quality and performance]]

[[Category:Pages with badly formatted tables]]

[[Category:Pages with badly formatted tables]]