Dr John Hooker

John Hooker atop the Cambrian Eriboll Sandstone in NW Scotland, summer 2010.

John Hooker atop the Cambrian Eriboll Sandstone in NW Scotland, summer 2010.

Post Doctoral Research Associate

Email: john.hooker@earth.ox.ac.uk

Planned Research

I will study various aspects of natural fractures in mudrocks. I am interested in mechanisms and timing of fracture formation, fracture size and spacing patterns, and fracture interaction and re-activation. It is apparent that all these aspects are sensitive to rock mechanical properties and the fluid temperature, pressure, and chemical conditions present during fracturing.

Previous Research

My PhD (University of Texas, 2012) was based on how natural fracture-size scaling patterns arise in sandstones. My work suggests that fracture size distributions can be modified by synkinematic cement precipitation. I used reconstructions of fracture opening to model the effects of precipitating cements on an evolving fracture set. The reconstructions use fluid inclusion microthermometry and burial history data to constrain fracture timing in the Sierra Madre Oriental in NE Mexico.

Selected Publications

Hooker, J.N., Cartwright, J., Stephenson, B., Silver, C., Dickson, A.J., and Hsieh, Y.-T., 2017. Fluid evolution in fracturing black shales, Appalachian Basin. AAPG Bulletin, doi: 10.1306/10031616030.

Hooker, J.N. and Cartwright, J., 2016. Dolomite overgrowths suggest a primary origin of cone-in-cone. Geological Magazine, 1-18, doi: 10.1017/S0016756816000807.

Hooker, J.N. and Katz, R.F., 2015. Vein spacing in extending, layered rock: the effect of synkinematic cementation. American Journal of Science 315, 557-588. doi: 10.2475/06.2015.03.

Hooker, J.N., Larson, T.E., Eakin, A., Laubach, S.E., Eichhubl, P., Fall, A., and Marrett, R., 2015. Fracturing and fluid-flow in a sub-décollement sandstone; or, a leak in the basement. Journal of the Geological Society 172, 428-442. doi:10.1144/jgs2014-128.

Hooker, J.N., Laubach, S.E., and Marrett, R., 2014. A universal power-law scaling exponent for fracture apertures in sandstones. Geological Society of America Bulletin 126 (9-10), 1340-1362. doi: 10.1130/B30945.1.

Hooker, J.N., Laubach, S.E., and Marrett, R., 2013. Fracture-aperture size—frequency, spatial distribution, and growth processes in strata-bounded and non-strata-bounded fractures, Cambrian Mesón Group, NW Argentina. Journal of Structural Geology 54, 54-71.

Hooker, J.N., Gomez, L.A., Laubach, S.E., Gale, J.F.W., and Marrett, R., 2012. Effects of diagenesis (cement precipitation) during fracture opening on fracture aperture-size scaling in carbonate rocks. In Garland, J., S.E. Laubach, J.E. Neilson, and K. J. Whidden (eds.) Advances in Carbonate Exploration and Reservoir Analysis, Geological Society of London Special Publication 370, 187-206.

Iñigo, J.F., Laubach, S.E., and Hooker, J.N., 2012. Fracture abundance and patterns in the Subandean fold and thrust belt, Devonian Huamampampa Formation petroleum reservoirs and outcrops, Argentina and Bolivia. Marine and Petroleum Geology 35, 201-218.

Eichhubl, P., Hooker, J.N., and Laubach, S.E., 2010. Pure and shear-enhanced compaction bands in Aztec Sandstone. Journal of Structural Geology 32, 1873–1886.

Hooker, J.N., Gale, J.F.W., Gomez, L.A., Laubach, S.E., Marrett, R., and Reed, R.M., 2009. Aperture-size scaling variations in a low-strain opening-mode fracture set, Cozzette Sandstone, Colorado. Journal of Structural Geology 31, 707–718.