Detection of Porous and Permeable Formations: From Laboratory Measurements to Seismic Measurements

J.L. Mari; D. Guillemot

doi:10.2516/ogst/2012009

Detection of Porous and Permeable Formations: From Laboratory Measurements to Seismic Measurements

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles ◽

10.2516/ogst/2012009 ◽

2012 ◽

Vol 67 (4) ◽

pp. 703-721 ◽

Cited By ~ 1

Author(s):

J.L. Mari ◽

D. Guillemot

Keyword(s):

Laboratory Measurements ◽

Seismic Measurements

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1984 SEG Workshops Report of the special workshops presented December 6–7, 1984, following SEG’s 54th Annual International Meeting and Exposition in Atlanta

Geophysics ◽

10.1190/1.1441993 ◽

1985 ◽

Vol 50 (7) ◽

pp. 1183-1219

Keyword(s):

Sedimentary Rocks ◽

Acoustic Velocity ◽

Seismic Exploration ◽

Laboratory Measurements ◽

International Meeting ◽

Individual Basis ◽

Transient Electromagnetic ◽

Electromagnetic Soundings ◽

Seismic Measurements

The workshop was organized into three topical units. The first unit included a presentation of laboratory measurements on a variety of frozen sedimentary rocks and permafrost, and an overview of problems and geophysical phenomena associated with permafrost. The second unit presented results of transient electromagnetic soundings in onshore and offshore permafrost environments. Comparisons were made with other geophysical results including acoustic velocity logs. Unit three of the workshop treated a variety of seismic measurements in diverse permafrost environments and served to focus the workshop on problems pertinent to seismic exploration for petroleum. This overview of the workshop was prepared by the organizers with review by the participants. Its purpose is to relate the principal topics and questions discussed in the workshop. Limitations on space require that greater detail on any topic be solicited on an individual basis from the appropriate participants.

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Influence of microheterogeneity on effective stress law for elastic properties of rocks

Geophysics ◽

10.1190/1.2816667 ◽

2008 ◽

Vol 73 (1) ◽

pp. E7-E14 ◽

Cited By ~ 12

Author(s):

Radim Ciz ◽

Anthony F. Siggins ◽

Boris Gurevich ◽

Jack Dvorkin

Keyword(s):

Effective Stress ◽

Seismic Data ◽

Elastic Moduli ◽

Seismic Velocity ◽

Time Lapse ◽

Seismic Velocities ◽

Laboratory Measurements ◽

Hydrocarbon Production ◽

Stress Coefficient ◽

Seismic Measurements

Understanding the effective stress coefficient for seismic velocity is important for geophysical applications such as overpressure prediction from seismic data as well as for hydrocarbon production and monitoring using time-lapse seismic measurements. This quantity is still not completely understood. Laboratory measurements show that the seismic velocities as a function of effective stress yield effective stress coefficients less than one and usually vary between 0.5 and 1. At the same time, theoretical analysis shows that for an idealized monomineral rock, the effective stress coefficient for elastic moduli (and therefore also for seismic velocities) will always equal one. We explore whether this deviation of the effective stress coefficient from unity can be caused by the spatial microheterogeneity of the rock. The results show that only a small amount (less than 1%) of a very soft component is sufficient to cause this effect. Such soft material may be present in grain contact areas of many rocks and may explain the variation observed experimentally.

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