Semiautomated method for cation-exchange capacity determination of reservoir rocks
The presence of significant amounts of clay in tight-gas sand formations makes the determination of cation exchange capacities (CEC) important for electric-log, self potential (SP), and gamma ray log interpretation. In the past, CEC measurements have been difficult and time-consuming to obtain. However, an automated method that avoids many difficulties of other techniques while determining the CEC's of many samples at one time has been described by Worthington. This work is a modification of the work done by Worthington. Easily assembled commercial equipment instead of specially built equipment is used to agitate rock samples contained in dialysis membrane bags during ion exchange with barium acetate solution and during washing of the samples to remove excess barium ions. Barium acetate is used as the source of barium ions instead of barium chloride, which is used in Worthington's procedure, to avoid corrosion of the stainless steel equipment. The amount of barium ions on the rock samples is then determined by conductometric titration with magnesium sulfate. The titration procedure is not automated. In addition, the use of the barium ion method was extended to samples with CEC values an order of magnitude lower than those determined by Worthington.
- Research Organization:
- U.S. DOE
- OSTI ID:
- 5500259
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Vol. 23:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Clay and framework mineralogy, cation exchange capacity, matrix density, and porosity from geochemical well logging in Kern County, California
INDIRECT DETERMINATION OF SULFATE BY NONAQUEOUS TITRIMETRY
Related Subjects
RESERVOIR ROCK
ION EXCHANGE
PERMEABILITY
SANDSTONES
ABSORPTION
ACETATES
AMMONIUM COMPOUNDS
AUTOMATION
BARIUM COMPOUNDS
CORROSION
DIALYSIS
ELECTRIC LOGGING
GAMMA LOGGING
MAGNESIUM SULFATES
SP LOGGING
STAINLESS STEELS
TITRATION
WATER
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CARBOXYLIC ACID SALTS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MAGNESIUM COMPOUNDS
OXYGEN COMPOUNDS
RADIOACTIVITY LOGGING
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
STEELS
SULFATES
SULFUR COMPOUNDS
WELL LOGGING
020200* - Petroleum- Reserves
Geology
& Exploration