Formation, distribution, and prediction of stylolites as permeability barriers in the thamama group, Abu Dhabi
In an Offshore Abu Dhabi field, an attempt has been made to predict vertical permeability through stylolite zones in uncored wells. Comparison of the stylolite intensity index, calculated from FDC/CNL logs following the method of Johnson and Budd, with measurements from whole core and plug analyses showed that a statistically valid relationship exists between these two parameters. Separate relationships have been established for stylolites above and below the oil/water contact as values in the water zone tend to be further reduced by continued cementation. The establishment of these relationships has enabled the prediction of vertical permeabilities through stylolite zones in uncored wells. Vertical permeabilities of less than 1md equate to a stylolite intensity index of 50, and in the subject field such zones are likely to severely limit fluid movement. Such geological analysis can thus provide a useful model for aiding reservoir simulation and field development.
- Research Organization:
- Robertson Research International Ltd.
- OSTI ID:
- 5199528
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE13698
- Country of Publication:
- United States
- Language:
- English
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