Characterization of light hydrocarbon-bearing reservoirs by gradient NMR well logging: A Gulf of Mexico case study
Conference
·
OSTI ID:471903
- and others
This paper presents a case study from an offshore Gulf-of-Mexico field that illustrates some of the advantages and limitations of new gradient NMR (MRI) well log interpretation methods for evaluating light hydrocarbon-bearing reservoirs. in one well, analysis of dual-wait time MRI log data using the differential spectrum method reveals the presence of free gas in shaly sand reservoirs that was invisible by the standard neutron-density {open_quotes}cross-over{close_quotes} method due to shaliness effects on the nuclear logs. Well test results have confirmed the MRI log interpretation in the one zone in this well that has been perforated to date. Effective porosity and free fluid volume readings were artificially suppressed due to the well-known effects of low hydrogen density and long T{sub 1} relaxation times characteristic of light hydrocarbons. However, the MRI irreducible water volume measurement was unaffected by light hydrocarbons and thus found to be a powerful tool for evaluating low-resistivity zones when integrated with conventional log analysis.
- OSTI ID:
- 471903
- Report Number(s):
- CONF-961003--
- Country of Publication:
- United States
- Language:
- English
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