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Reservoir Geophysics

Competency Statement:

Analyze and interpret seismic and geological data to help describe a reservoir. Convert seismic time horizons to depth, based on well and seismic velocities. Evaluate seismic facies and their depositional environment to produce analogs of a potential reservoirs.

Learning Objective:

  • Analyze seismic interpretation to determine best methodology for depth conversion
  • Present Pros and Cons of different depthing approaches
  • Select depositional model analog that best fits the regional and seismic facies characteristics
  • Evaluate seismic facies with reservoir properties determined from wells, to gain insight to reservoir property distribution

Assignment Instruction:

As the geophysicist you have to generate depth maps for the development of a reservoir, drilled by a number of wells. 

Firstly you have to make a correlation between well information and surface seismic data.  For this you will have to generate synthetic seismograms. 

Next you will have to decide on the strategy for depth conversion, for which you will have to consider various options and types of data.  You will have a 3D dataset complete with stacking velocities.

Lastly, you will have to consider using available VSP data.

Setting the scene

In the development of hydrocarbon resources, many disciplines play important roles. Typically a reservoir is considered for development if commercial volumes have been established by exploration and appraisal wells.

Even though circumstances may be different in various countries and within different operating companies, a common sequence of events can be distinguished.

Once a new reservoir has been identified the seismic 3D/2D is re-interpreted. Possibly after it has been reprocess using the new subsurface information. All available well data is integrated in the seismic evaluation, together with up-to-date laboratory and petrophysical analyses.

This module treats this sequence of seismic evaluation.

In parallel a careful review is being made of all geological data.  By the time the seismic evaluation is yielding its first results, geologists and geophysicists should have jointly create reservoir models.  In this phase a feedback loop between the team members is essential to define the interwell geometries and continuity of the productive strata.

In this assignment you will explore the various techniques and working practices of all peripheral, yet vitally important, activities around seismic interpretation itself, starting from basic principles.