Net Reservoir Mapping – A Geologist’s Key to Reservoir Definition

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When it comes to prospecting for hydrocarbon-bearing rock formations at the basin level, geologists utilize net reservoir maps to help define fluid-rich intervals within geological units.

To develop an effective net reservoir map, knowledge of what geological properties separate productive rock from non-productive rock is essential. Positive production trends can be associated with geologic parameters to identify characteristics with the most influence on reservoir quality and well results. These relationships can be taken a step further by tying specific well log signature cut-offs to production estimations. These cut-offs, as observed by the dashed lines in Figure 1, provide a benchmark for geologists to use in their attempt to differentiate hydrocarbon-bearing intervals from non-hydrocarbon-bearing intervals. These can be both positive and negative relationships.

The application of these cut-offs to each respective geological property highlights the vertical intervals within a formation that correspond to promising reservoir rock. Net reservoir is defined by observing regions where this reservoir rock, as suggested by each property, overlaps in depth. This interval is represented by the green blocks in the chart.

Mapping the thickness of overlapping cut-offs across all the available data points in the basin provides quick insight into the most promising future drilling locations, with more granularity than your average top-to-bottom averaging exercise.

FIGURE 1 | Net Pay Type Log

Net Reservoir Mapping – A Geologist’s Key to Reservoir Definition

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