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Water Saturation Determination Methods in Hydrocarbon Reservoirs

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Questions and Answers

Why is it important to establish water saturation in reservoir analysis?

To determine the resistivity of the oil
To understand the geological history of the reservoir
To calculate the overburden pressure
To eventually calculate hydrocarbon saturation (correct)

What is the basis for the Pickett Plot method for water saturation determination?

Deriving equations from the Archie relationship
Assuming water saturation is unknown (correct)
Using resistivity logs
Calculating overburden corrections

Why is water saturation determined first before calculating hydrocarbon saturation in reservoir analysis?

To simplify the calculation process
Because electrical current flows in water, not in oil (correct)
To establish a baseline for core analysis data
To ensure the accuracy of overburden corrections

What role do resistivity logs play in determining hydrocarbon saturation?

Directly calculate hydrocarbon saturation (C) Signup and view all the answers

Why do almost all water saturation equations stem from the Archie equation?

Because Archie equation considers water resistivity (B) Signup and view all the answers

What does the formula n log Sw = log F + log Rw - log Rt represent in reservoir analysis?

Relationship between different parameters for water saturation determination (C) Signup and view all the answers

What is the equation for log Rt in a Hingle plot at 100% Sw?

-m log φ + log (a Rw) (A) Signup and view all the answers

What does a slope of 'n-m' on a Pickett plot indicate?

The line slopes to the left (D) Signup and view all the answers

What is the significance of 'm' in the Pickett plot?

It allocates all uncertainties to the value of m (C) Signup and view all the answers

How can the water saturation equations be solved using the Hingle plot?

By linearising the Sw-φ relationship with logarithms (B) Signup and view all the answers

What does a straight line in a log-log plot of Rt versus φ indicate?

'a' equals unity at the intersection (D) Signup and view all the answers

What does Buckles propose about the relationship between Swi and φ?

Their product is constant and can be plotted as a hyperbolic function (C) Signup and view all the answers

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