Kőzetdeformáció mechanikai és geokémiai folyamatok határán üledékes medencékben

Rock deformation at the interaction of mechanical and geochemical processes in sedimentary basins


  • FALL András


törések/repedések, erek, fluid zárványok, geokémia, üledékes medencék


Attesting deformation, natural fractures and faults are pervasive in low-porosity rocks in sedimentary basins. In the diagenetic realm fractures in rocks locally affect the flow of hot, reactive fluids and rock strength. Hot fluids cause dissolution, cement precipitation, and other chemical reactions, which can profoundly modify where fracture porosity, and as a consequence, connectivity exists. Although fractures may form in different settings at different locations, and at different times throughout a basin evolution history, they can potentially show similar patterns and geometric attributes, such as their position relative to bedding, shapes, aperture sizes, and cement infill types and textures. The similarity of patterns and geometric shapes impedes interpretation of intrinsically limited subsurface fracture data. Cement infills and textures, fluid inclusions trapped within, and cement isotopic compositions, on the other hand, can provide powerful evidence useful for unraveling the origin and timing of fracture formation. This presentation offers a glimpse into how geochemical analysis of fracture cements is revolutionizing fracture description and interpretation, and shows how the complexity of cement deposits are the key to unlocking the otherwise difficult-to-interpret simple patterns and geometric shapes of opening-mode fractures.


LAUBACH, S.E., LANDER, R.H., CRISCENTI, L.J., ANOVITZ, L.M., URAI, J.L., POLLYEA, R.M., HOOKER, J.N., NARR, W., EVANS, M.A., KERISIT, S.N., OLSON, J.E., DEWERS, T., FISHER. D., BODNAR., R.J., EVANS, B., DOVE, P., BONNELL, L.M., 2019: The role of chemistry in fracture pattern development and opportunities to advance interpretations of geological materials. Reviews in Geophysics, 57, 1065–1111.

OLSON, J.E., LAUBACH, S.E., LANDER, R.H., 2009: Natural fracture characterization in tight gas sandstones: Integrating mechanics and diagenesis. AAPG Bulletin, 93, 1535–1549.

LAUBACH, S.E., 2003: Practical approaches to identifying sealed and open fractures. AAPG Bulletin, 87, 561–579.

LANDRY, C.J., EICHHUBL, P., PRODANOVIĆ, M., WILKINS, S., 2016: Nanoscale grain boundary channels in fracture cement enhance flow in mudrocks. Journal of Geophysical Research: Solid Earth, 121, 3366-3376.

GALE, J.F.W., LAUBACH, S.E. OLSON, J.E., EICHHUBL, P., FALL, A., 2014: Natural fractures in shale: a review and new observations. AAPG Bulletin, 98, 2165–2216.

ENGELDER, T., 1985: Loading paths to fracture propagation during a tectonic cycle—an example from the Appalachian Plateau. Journal of Structural Geology, 78, 459-476.

ENGLISH, J.M., LAUBACH, S.E., 2017: Opening-mode fracture systems – Insights from recent fluid inclusion microthermometry studies of crack-seal fracture cements. In: Turner, J.P., Healy, D., Hillis, R.R., and Welch, M. (eds.) Geomechanics and Geology: Geological Society Special Publication, 458, 257-272, London, UK.

FALL, A., BODNAR, R.J., 2018: How precisely can the temperature of a fluid event be constrained using fluid inclusions? Economic Geology, 113, 1817–1843.

BECKER, S.P., EICHHUBL, P., LAUBACH, S.E., REED, R.M., LANDER, R.H., & BODNAR, R.J., 2010: A 48 m.y. history of fracture opening, temperature, and fluid pressure: Cretaceous Travis Peak Formation, East Texas Basin. GSA Bulletin, 122, 1081–1093.

FALL, A., EICHHUBL, P., CUMELLA, S.P., BODNAR, R.J., LAUBACH, S.E., BECKER, S.P., 2012: Testing the basin-centered gas accumulation model using fluid inclusion observations: southern Piceance Basin, Colorado. AAPG Bulletin, 96, 2297–2318.

FALL, A., EICHHUBL, P., BODNAR, R.J. LAUBACH, S.E., DAVIS, J. S., 2015: Natural hydraulic fracturing of tight-gas sandstone reservoirs, Piceance Basin, Colorado. GSA Bulletin, 127, 61–75.

FALL, A., 2020, Applications of fluid inclusions in structural diagenesis. In Lecumberri-Sanchez, P., Steele-MacInnis, M., Kontak, D. (eds.), Fluid and Melt Inclusions: Applications to Geologic Processes. Mineralogical Association of Canada, Topics in Mineral Sciences, 49, p. 17-46, Québec, Canada.