Burial stress and elastic strain of carbonate rocks

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doi: 10.1111/1365-2478.12184
Author(s): Fabricius, Ida Lykke
Author Affiliation(s): Primary:
Technical University of Denmark, Department of Civil Engineering, Denmark
Volume Title: Physics of rocks for hydrocarbon exploration
Volume Author(s): Best, Angus, editor
Source: Geophysical Prospecting, 62(6), p.1327-1336; Second international workshop on Rock physics (2IWRP), Southampton, United Kingdom, Aug. 4-9, 2013, edited by Angus Best. Publisher: Blackwell on behalf of the European Association of Geoscientists & Engineers (EAGE), Houten, Netherlands. ISSN: 0016-8025 CODEN: GPPRAR
Note: In English. 27 refs.; illus., incl. geol. sketch map
Summary: Burial stress on a sediment or sedimentary rock is relevant for predicting compaction or failure caused by changes in, e.g., pore pressure in the subsurface. For this purpose, the stress is conventionally expressed in terms of its effect: "the effective stress" defined as the consequent elastic strain multiplied by the rock frame modulus. We cannot measure the strain directly in the subsurface, but from the data on bulk density and P-wave velocity, we can estimate the rock frame modulus and Biot's coefficient and then calculate the "effective vertical stress" as the total vertical stress minus the product of pore pressure and Biot's coefficient. We can now calculate the elastic strain by dividing "effective stress" with the rock frame modulus. By this procedure, the degree of elastic deformation at a given time and depth can be directly expressed. This facilitates the discussion of the deformation mechanisms. The principle is illustrated by comparing carbonate sediments and sedimentary rocks from the North Sea basin and three oceanic settings: a relatively shallow water setting dominated by coarse carbonate packstones and grainstones and two deep water settings dominated by fine-grained carbonate mudstones and wackestones. Abstract Copyright (2014), European Association of Geoscientists & Engineers.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 20 Geophysics, Applied; 29 Economic Geology, Energy Sources; Algorithms; Atlantic Ocean; Body waves; Carbonate rocks; Caribbean Sea; Cementation; Clastic rocks; Compaction; Coral Sea; Diagenesis; Elastic waves; Elasticity; Equatorial Pacific; Geophysical methods; Geophysical surveys; Leg 130; Leg 165; Leg 194; Mudstone; North Atlantic; North Pacific; North Sea; Northwest Pacific; Ocean Drilling Program; Ontong Java Plateau; P-waves; Pacific Ocean; Pore pressure; Reservoir properties; Rock mechanics; Sedimentary rocks; Seismic methods; Seismic waves; South Pacific; Southwest Pacific; Strain; Stress; Surveys; Velocity; Wackestone; West Pacific
Coordinates: N103000 N193000 W0650000 W0830000
S210500 S201000 E1530500 E1514500
N001906 N033626 E1613538 E1563728
Record ID: 2015108468
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom