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

Journal Article · · Energy Sources (N.Y.); (United States)
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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), Journal Name: Energy Sources (N.Y.); (United States) Vol. 9:2; ISSN EGYSA
Country of Publication:
United States
Language:
English

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Related Subjects

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