Laumontization and its relationship to carbonate cementation and dissolution within Santa Fe Springs oil field, Los Angeles basin, California

Conference · Fri May 01 04:00:00 EDT 1987 · AAPG Bull.; (United States)

OSTI ID:6443577

Coffman, R L

Diagenetic changes (smectite to illite transformations, albitization, carbonate and zeolite cementation and dissolution reactions) have been documented within the Santa Fe Springs oil field and throughout the Los Angeles basin in general. Petrographic examination of well core samples from Santa Fe Springs has resulted in the recognition of a diagenetic front at a depth of about 2580 m. Above this front the rocks have extensive laumontization and albitization, whereas below it widespread carbonate cementation is present. Although the laumontite occurs above the carbonate cement, there is no evidence of previous laumontization within or below the carbonate cemented zone. Nearly all plagioclase within the laumontite cemented rocks exhibits extensive albitization, whereas fresh plagioclase grains occur in the carbonate cemented and underlying horizons. This indicates carbonate cementation preceded laumontization and effectively insulated these rocks against further alteration. Secondary porosity is extensive in certain horizons within the carbonate zone, whereas only a small amount of porosity is present in the laumontite zone. This porosity within the laumontite zone appears to be the result of selective dissolution, indicating laumontite is not necessarily a diagenetic basement as has been thought.

• Research Organization: Univ. of California, Santa Barbara
• OSTI ID: 6443577
• Report Number(s): CONF-870606-
• Conference Information: Journal Name: AAPG Bull.; (United States) Journal Volume: 71:5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CALIFORNIA
CARBONATE ROCKS
DIAGENESIS
FEDERAL REGION IX
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOLOGY
MINERAL RESOURCES
NORTH AMERICA
OIL FIELDS
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
USA