Picture of UK Houses of Parliament

Leading national thinking on politics, government & public policy through Open Access research

Strathprints makes available scholarly Open Access content by researchers in the School of Government & Public Policy, based within the Faculty of Humanities & Social Sciences.

Research here is 1st in Scotland for research intensity and spans a wide range of domains. The Department of Politics demonstrates expertise in understanding parties, elections and public opinion, with additional emphases on political economy, institutions and international relations. This international angle is reflected in the European Policies Research Centre (EPRC) which conducts comparative research on public policy. Meanwhile, the Centre for Energy Policy provides independent expertise on energy, working across multidisciplinary groups to shape policy for a low carbon economy.

Explore the Open Access research of the School of Government & Public Policy. Or explore all of Strathclyde's Open Access research...

Along-strike fault core thickness variations of a fault in poorly lithified sediments, Miri (Malaysia)

Sosio De Rosa, Silvia and Shipton, Zoe K. and Lunn, Rebecca J. and Kremer, Yannick and Murray, Titus (2018) Along-strike fault core thickness variations of a fault in poorly lithified sediments, Miri (Malaysia). Journal of Structural Geology, 116. pp. 189-206. ISSN 0191-8141

[img]
Preview
Text (Sosio-de-Rosa-etal-JSG-2018-Along-strike-fault-core-thickness-variations-of-a-fault)
De_Rosa_etal_JSG_2018_Along_strike_fault_core_thickness_variations_of_a_fault.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo

Download (14MB)| Preview

    Abstract

    Fault resistance to across-fault fluid flow is as strong as its weakest point. Processes that determine patches of the fault surface containing transmissible fault rocks must be taken into account to produce reliable predictions of cross fault fluid flow. We use a study site in Miri as a natural laboratory to investigate in detail the fault core thickness variations along-strike and down dip and to quantify the risk of discontinuities in the clay-rich fault core. Five fault core types have been identified: foliated clay-rich fault core, chaotic clay-rich fault core, attenuated clay-rich fault core, sandy anastomosing shears and sandy breccia. The sandy fault rocks are likely to have lower capillary entry pressure, and higher permeability than the clay-rich rock, so could represent potential cross-fault flow pathways. We performed a geostatistical analysis, showing a correlation over 3 m scale, suggesting the presence of ‘patches’ of thin and thick fault core generally less than 3m in length. We interpret this as superimposition of two (or more) different deformation processes at a smaller and larger scale. We speculate on the processes that could produce the observed distribution of thickness and composition, in particular processes that could have disrupted the through-going clay-rich core.