Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
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| Title | MICRO.BAS: A basic program for determining effective intergranular porosity and water saturation in reservoirs with bimodal pore systems |
| Creator/Author | Asquith, G.B. (Texas Tech Univ., Lubbock (USA)) |
| Publication Date | 1988 Nov 01 |
| OSTI Identifier | OSTI ID: 7181596 |
| Other Number(s) | ISSN0885-6362; CODEN: GEOBE |
| Resource Type | Journal Article |
| Resource Relation | Geobyte ; Vol/Issue: 3:4 |
| Subject | 020200 -- Petroleum-- Reserves, Geology, & Exploration ;020300 -- Petroleum-- Drilling & Production ;990200 -- Mathematics & Computers; RESERVOIR ROCK-- POROSITY; BASIC;COMPUTER CALCULATIONS;DOLOMITE;LIMESTONE;NATURAL GAS DEPOSITS;PERSONAL COMPUTERS;PETROLEUM DEPOSITS;WATER SATURATION;WELL LOGGING |
| Related Subject | ALKALINE EARTH METAL COMPOUNDS;CALCIUM CARBONATES;CALCIUM COMPOUNDS;CARBON COMPOUNDS;CARBONATE MINERALS;CARBONATE ROCKS;CARBONATES;COMPUTERS;DIGITAL COMPUTERS;GEOLOGIC DEPOSITS;MAGNESIUM CARBONATES;MAGNESIUM COMPOUNDS;MICROCOMPUTERS;MINERAL RESOURCES;MINERALS;OXYGEN COMPOUNDS;PROGRAMMING LANGUAGES;RESOURCES;ROCKS;SATURATION;SEDIMENTARY ROCKS |
| Description/Abstract | Bimodal pore system reservoirs present difficult evaluation problems.^A hydrocarbon-bearing reservoir, containing both intragranular microporosity and intergranular megaporosity, will result in high calculated Archie water saturations, regardless of true water saturations.^These inaccurate calculations occur because of bound water in the intragranular microporosity.^This condition contributes to electrical conductivity measured by petrophysical logs, but, because the water is immovable, does not affect a reservoir`s actual fluid conductivity.^Therefore, the microporosity is not effective, and the only effective porosity is the reservoirs intergranular megaporosity.^This paper proposes a method for determining true water saturation and effective porosity in bimodal reservoirs, using a BASIC computer program, MICRO.BAS.^It suggests that, if one porosity type in a bimodal reservoir can be delineated and its water saturation properly identified, the other can be deduced, and the reservoir`s actual effective porosity and true water saturation determined.^MICRO.BAS is designed to do the necessary calculations on limestones, dolomites, or cherts with microporosity. |
| Country of Publication | United States |
| Language | English |
| Format | Pages: 17-23 |
| System Entry Date | 2001 May 13 |
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