http://mech.spbstu.ru/images/b/bd/Potyondy_Cundall_2004_A_bonded-particle_model_for_rock.pdf

A bonded-particle model for rock

Preface 1. Basic tools 2. Elasticity and Hooke's law 3. Seismic wave propagation 4. Effective media 5. Granular media 6. Fluid effects on wave propagation 7. Empirical relations 8. Flow and diffusion 9. Electrical properties Appendices.

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The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media

Interpretation theory in applied geophysics: Grant, F S ... Interpretation theory in applied geophysics Unknown Binding – January 1, 1965 5.0 out of 5 stars 1 rating. See all formats and editions Hide other formats and editions. The Amazon Book Review Book recommendations, author interviews, editors' picks, and more. Read it now. Enter your mobile number or email address below and we'll send you a ...

Interpretation Theory in Applied Geophysics Grant (McGraw-Hill, 140s.)

https://pangea.stanford.edu/departments/geophysics/dropbox/STRESS/publications/MDZ%20PDF's/2006/2006_Empirical_relations_between_rock_strenght.pdf

Empirical relations between rock strength and physical properties in sedimentary rocks

Detailed physics, predictive capabilities and macroscopic consequences for pore-network models of multiphase flow.

Elasticity . Linear elasticity. Non-linear elasticity. Poroelasticity. Time-dependent effects. Failure mechanics. Basic concepts. The failure surface. Shear failure - Mohr's hypothesis. Failure criteria which depend on the intermediate stress. Representation of experimental data. Extension tests. Post-failure behaviour. The theory of plasticity. Soil mechanics. Failure mechanics of saturated rocks. Anisotropy and rock mechanical failure. Some geological aspects of rock mechanics. Underground stresses. Pore pressure. Rock mechanical properties. Stresses around boreholes, and borehole failure criteria. Stresses around boreholes. Borehole failure criteria. Beyond failure initiation. Acoustic wave propagation in rocks. The wave equation. P- and S-waves. Sound velocities in rocks. Acoustic attenuation in rocks. Biot's theory of acoustic wave propagation. Acoustic anisotropy. Rock mechanics and rock acoustics. Micromechanical models. Grain pack models. Effective medium theories of rocks containing cracks. Fractured rocks. Mechanical properties from laboratory analysis. Core samples for rock mechanical laboratory analysis. Laboratory equipment. Rock mechanical test procedures. Index Tests. Acoustic measurements. Mechanical properties from field data. Estimation of elastic parameters. Estimation of in situ stresses. Estimation of strength parameters. Stability during drilling. Unstable boreholes - reasons and consequences. The principle of a stability analysis. Calculation of minimum mudweight required to prevent borehole collapse. Calculation of maximum mudweight before fracturing. Example calculation. Evaluation of the method and the results. Other aspects of practical importance. Sand prediction. What is sand production? How can sand production be controlled? Mechanisms for sand production. What is sand prediction? Examples of problems to be considered. Modelling for sand prediction. Fracturing. Conditions for tensile failure. Orientation and confinement of fractures. Fracturing pressures. Formation break-down pressures. Determination of fracturing pressures from minifrac tests. Pressures during frac jobs. Fracture gradients in drilling. Reservoir compaction. Subsidence and well problems. Elastic modelling of compaction and subsidence. Consolidation theory. A Consolidation type subsidence model. Laboratory testing for compaction predictions. Numerical modelling of compaction and subsidence. Well Problems associated with compaction. Appendix A. Appendix B. Symbols. Index.

Petroleum Related Rock Mechanics

A method is reported for the production of synthetic porous sandstones containing cracks of known dimensions and geometry with respect to the matrix. A synthetic sandstone was manufactured from Sand cemented with an epoxy glue. The cracks of known geometry were introduced into the material in the manufacturing stage, by emplacing thin metallic discs in the Sand-epoxy matrix. These discs were chemically leached out of the consolidated porous sandstone. Acoustic anisotropy. and shear-wave splitting were observed in the synthetic sandstones. For the dry sample the observed angular dependence of the P- and S- wave velocities (at 100 kHz) compares well, qualitatively, with the theoretical models of Hudson and of Thomsen. Quantitatively, however, the experimental data fits Hudson's model better. For the case of a saturated sample the experimental results are in excellent agreement with Thomsen's model. Hudson's model, on the other hand, predicts a different angular dependence for P-waves. This demonstrates that the concept of fluid transfer between cracks and the ambient porosity can be a significant process. The results reported here are from the first successful experiment in which the theoretical models were tested on a porous material containing a known crack geometry.

P‐ and S‐wave anisotropy of a synthetic sandstone with controlled crack geometryl1

North Sea Oil and Gas Reservoirs - Iii

Publisher Summary The purpose of this chapter is to give an introduction to geological aspects, which are of particular importance in petroleum related rock mechanics. The present state of a rock and its present mechanical properties are of interest. A sedimentary basin may be exposed to sedimentary subsidence, sea-level changes and tectonic forces creating repeated cycles of elevation and depression, in addition to erosion, changes in sedimentary environment, changes in sedimentation rate, solution and precipitation of cementing material etc. All these effects will complicate the geological description of the sedimentary basin. These geological activities and events will affect not only current rock mechanical properties, but also current boundary conditions in terms of in situ stresses and pore pressure. Therefore, knowledge of geological processes is valuable in rock engineering. Although on a totally different time scale and length scale, geological processes are often comparable with events in rock mechanics laboratory testing, which means that such tests may be used to enhance our understanding of geological phenomena.

Rune M. Holt

Papers

Petroleum Related Rock Mechanics

P‐ and S‐wave anisotropy of a synthetic sandstone with controlled crack geometryl1

North Sea Oil and Gas Reservoirs - Iii

Chapter 3 Geological aspects of petroleum related rock mechanics

Brittleness of shales: Relevance to borehole collapse and hydraulic fracturing