Evaluation of water saturation in oil-bearing shaly sands

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Geobyte; (United States)

OSTI ID:6093121

Martinovic, S; Vojnovic, V ^[1]

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1. Nafta-Gas/Tehnikac, Novi Sad, (Yugoslavia)

The physical properties of shaly formations are difficult to evaluate because the shale component strongly affects geophysical well log and laboratory test data. This is particularly true in the case of water saturation. On the other hand, the accuracy of in-situ hydrocarbon estimates depends directly on the accuracy of water saturation values. The most important interpretation models for water saturation rely on double-layer models. These interpretation models compute highly probably water saturation values of oil-bearing shaly sands using sound mathematical and physical postulates. Certain disadvantages, such as the inability to evaluate some crucial parameters directly from geophysical well logs, simplifications along the system-model line, inherent deficiencies of logging techniques, etc., give rise to errors and other problems which are more or less solved at this stage of development. A simple program for water saturation of oil-bearing shaly sands was designed and tested. The program uses equations based on double layer models. Program listing and test results also are presented.

• OSTI ID: 6093121
• Journal Information: Geobyte; (United States), Vol. 5:3; ISSN 0885-6362
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
RESERVOIR ROCK
WATER SATURATION
ACCURACY
COMPUTER CALCULATIONS
COMPUTERIZED SIMULATION
MATHEMATICAL MODELS
OIL SATURATION
OIL WELLS
PETROLEUM DEPOSITS
SHALES
WELL LOGGING
GEOLOGIC DEPOSITS
MINERAL RESOURCES
RESOURCES
ROCKS
SATURATION
SEDIMENTARY ROCKS
SIMULATION
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
990200 - Mathematics & Computers