Influx of water from overlying, undercompacted, overpressured shale beds into producing reservoirs

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Energy Sources (N.Y.); (United States)

DOI:https://doi.org/10.1080/00908318708908685· OSTI ID:6001689

Dzhevanshir, R D; Chilingarian, G V; Yen, T F

The analysis of the exploitation of the oil and gas fields with abnormally high formation pressures (AHFP) revealed the possibility of the pore water influx from the overlying, undercompacted, overpressured shales into the productive zones, situated at the lower levels. A study of a well with abnormally high formation pressure in South Louisiana showed a change in pulsed neutron logging index of clay caprocks as a result of porosity reduction (compaction), caused by decrease in pore pressure and pore water explusion to the underlying productive zones. The investigation of oil fields in southwestern Turkmenistan and Baku Archipelago in USSR supplied information on an uninvaded resisitivity in clay formations lying above the producing zones. Influx of water from undercompacted, overpressured shales into producing formations was also discussed elsewhere. This paper represents an attempt to evaluate the variation of pore pressure with time in shales overlying the producing formation, and to estimate the volume of the outflowing water from shales in the process of the underlying reservoir exploitation.

• Research Organization: Academy of Sciences of Azerbayjan SSR, Baku
• OSTI ID: 6001689
• Journal Information: Energy Sources (N.Y.); (United States), Vol. 9:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
NATURAL GAS WELLS
WATER INFLUX
OIL WELLS
CAP ROCK
CLAYS
EXPLOITATION
GEOPRESSURE ANOMALIES
NEUTRON LOGGING
OIL FIELDS
POROSITY
PRESSURE EFFECTS
PULSED NEUTRON TECHNIQUES
RESERVOIR PRESSURE
RESISTIVITY SURVEYS
SHALES
USSR
ASIA
EASTERN EUROPE
ELECTRICAL SURVEYS
EUROPE
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
PETROLEUM DEPOSITS
RADIOACTIVITY LOGGING
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SURVEYS
WELL LOGGING
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing