QCB/QDB4033 Quiz (CLO1 and CLO2)

Which of the following is NOT a seismic attribute?

• Amplitude

• Phase

• Time

• Frequency

Which of the following is TRUE about amplitude and phase attributes?

• • Amplitude attributes represent the strength of a seismic reflection, while phase attributes represent the timing of a seismic reflection.

• • Amplitude attributes represent the time of a seismic reflection, while phase attributes represent the depth of a seismic reflection.

• Amplitude attributes represent the frequency of a seismic reflection, while phase attributes represent the direction of a seismic reflection.

• Amplitude attributes represent the strength of a seismic reflection, while phase attributes represent the direction of a seismic reflection.

What are some of the challenges in identifying seismic horizons?

• The presence of noise

• The complexity of the subsurface

• The limited resolution of seismic data

• All

Which of the following volume attributes is used to measure the similarity of seismic reflections in different parts of a volume?

• amplitude

• Phase

• Frequency

• Coherence

Coherence attributes are used to measure the:

• Similarity of seismic reflections in different parts of a volume.

• Amplitude of seismic reflections.

• Frequency of seismic reflections.

• Phase of seismic reflections.

Coherence attributes are calculated using the:

• Cross-correlation of seismic traces.

• Autocorrelation of seismic traces.

• Fourier transform of seismic traces.

• Wavelet transform of seismic traces.

• Convolution of seismic traces.

Curvature attributes are used to measure the:

• Similarity of seismic reflections in different parts of a volume.

• Amplitude of seismic reflections.

• Frequency of seismic reflections.

• Curvature of seismic surfaces.

Curvature attributes can be used to:

• Delineate hydrocarbon reservoirs.

• Identify potential hydrocarbon traps.

• Delineate faults and channels.

• All of the above.

What is a seismic voxel?

• • A seismic voxel is a three-dimensional volume element that represents a small portion of the subsurface.

• • A seismic voxel is a two-dimensional slice of the subsurface.

• • A seismic voxel is a single point in the subsurface.

• • A seismic voxel is a line segment in the subsurface.

What are the three dimensions of a seismic voxel?

• • X, Y, and Z

• • Time, Frequency, and Amplitude

• • Time, Depth, and Amplitude

• • Frequency, Depth, and Amplitude