Deep-burial diagenesis. Annual progress report

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5498079

Friedman, G M

The purpose of this research program is to investigate deep burial diagenesis in carbonate rocks with emphasis on the evolution of rock textures, and porosity with depth. Initial investigation of compression tests on pure ooids at a constant pressure of 64,200 lbs. (2.5 kb), but at variable temperatures of 150/sup 0/, 200/sup 0/, and 250/sup 0/C have resulted in dramatic reduction in visible porosity from 31% (uncompacted samples) to slightly over 16% in compacted ones. Furthermore, these have produced different deformational features that are found in the rock record. The visible porosity, however, remains constant in all the samples subjected to constant pressure, but variable temperatures. Petrographic studies of carbonate-rock cuttings from depths in excess of 20,000 feet (6 km) in the Anadarko Basin of Texas and Oklahoma illustrate various diagenetic changes caused by the increased depth. These products of deep burial include: (1) total recrystallization in which no depositional textures remain preserved; (2) elongate calcite grains which show a preferred orientation of long axes; and (3) the presence of grain diminution.

• Research Organization: Rensselaer Polytechnic Inst., Troy, NY (USA)
• DOE Contract Number: AC02-81ER10921
• OSTI ID: 5498079
• Report Number(s): DOE/ER/10921-1; ON: DE82009531
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
CARBONATE ROCKS
CRYSTALLIZATION
DEPTH
DEPTH 6-9 KM
DIAGENESIS
DIMENSIONS
PHASE TRANSFORMATIONS
POROSITY
PRESSURE DEPENDENCE
ROCKS
SEDIMENTARY ROCKS
TEMPERATURE DEPENDENCE