Method for determining formation porosity and gas saturation...

Details Method for determining formation porosity and gas saturation... Method for determining formation porosity and gas saturation...

G - Physics

01

V

G01V 5/14 (2006.01)

Patent

CA 2567895

Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where invasion is minimal. Using a Monte-Carlo method, a relationship is established between true formation porosity and porosity estimates from density and porosity tools. This relationship is used on real data to get an improved estimate of formation porosity and of gas saturation.

Des mesures effectuées avec des outils d'enregistrement de porosité et de densité dans un réservoir de gaz peuvent différer en raison des effets d'invasion. Ces effets sont particulièrement importants sur des applications de mesure en cours de forage, où l'invasion est minimale. A l'aide d'une méthode de Monte-Carlo, une relation est établie entre une vraie porosité de formation et des estimations de porosité provenant d'outils de densité et de porosité. Cette relation est utilisée sur des données réelles afin d'obtenir une meilleure estimation de la porosité de la formation et de la saturation en gaz.

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