A new approach to P/Z analysis in abnormally pressured reservoirs
Conference
·
OSTI ID:468127
Future performance of gas reservoirs can be predicted if one identifies the main drive mechanisms and the original gas-in place. The extrapolation of the p/z versus cumulative gas production plot is a commonly accepted method that is used to estimate original gas in-place in volumetric gas reservoirs. However, abnormally pressured reservoirs usually exhibit initial pressure gradients in excess of 0.65 psi/pt at depths greater than 10,000 ft. As a result, in addition to fluid expansion, gas is produced by sand grain expansion, rock compaction and water expansion. As formation compressibility approaches gas compressibility, the standard p/z curve tends to bend downward, making {open_quotes}straight line extrapolation{close_quotes} questionable. To account for this compaction phenomenon, some authors suggested to modify the material balance equation by incorporating constant pore and water compressibilities.
- OSTI ID:
- 468127
- Report Number(s):
- CONF-961003--
- Country of Publication:
- United States
- Language:
- English
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