Page 147 - Well Logging and Formation Evaluation

CHAPTER 10

PRODUCTION GEOLOGY

ISSUES

The purpose of this chapter is to provide readers with a convenient refer-
ence for production geology as it relates to the petrophysicist’s daily tasks,
though not intended to be a comprehensive guide to the wider discipline.
The interface between the petrophysicist and production geologist is
crucial in ensuring that:

• Wells are proposed and drilled in optimum locations
• The correct operational decisions are made while the well is drilled
• The field model makes optimal use of the available well data
• Production from the well can be properly understood in a structural
context

For this interface to work well, it is essential that both discplines have a
working understanding of each other and a common terminology.
The primary duties of the production geologist are as follows:

1. Correlate all the available well data within the production area, pro-
viding a logical and consistent formation designation scheme.
2. Prepare, in conjunction with the seismologist, geological subsurface
interpretations comprising subsurface maps of key horizons and cross
sections.
3. Update subsurface interpretations as new well/seismic data become
available.
4. Advise on selection of new well locations.
5. Determine the gross bulk volume (GBV) of the reservoir, which may
be used, in conjunction with data provided by the petrophysicist, to
determine net pore volume (NPV), hydrocarbons initially in place

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