Increasing Accuracy and Resolution
in Porosity Prediction for Carbonate
Reservoirs Using High-
Resolution
Seismic Technology in the Arenque-Lobina Area,
Offshore Mexico
Richard Salter1, Marc Beller1, Dianna
Shelander1, Ben Flack1, Diana Gillespie1,
Francisco Pineda2, and Jose Camara2
1 Reservoir Services/DCS, Schlumberger, Houston, TX
2 PEMEX,
A high-resolution
seismic survey covering 320km2 over the Arenque and
Lobina fields was acquired with the express intention of helping to guide new
well locations. This survey obtained significantly higher frequency content than
conventional seismic data over the field area with a maximum frequency of 60Hz
at 2.5s compared to 30Hz previously obtained.
The resolution
and fidelity of the seismic data enabled an enhanced
interpretation that provided a much clearer understanding of the structural and
stratigraphic controls over the survey than had been possible to interpret using
the conventionally acquired and processed seismic data. The ability to map
discretely key reservoir units provided a structural framework through which
reservoir properties could be accurately mapped. A robust inversion workflow was
employed to maximize the use of the data. Numerous wells were used in the study
to help determine reliable petrophysical transforms that could be applied to the
inverted P-wave impedance to obtain highly quantitative porosity measurements.
The quantification of porosity development in the Cretaceous Tamaulipas and Jurassic San Andres reservoirs has provided substantial and valuable assistance in identifying new prospect areas as well as reducing risk in the assessment of several planned drill locations.
AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005