AAPG PSGD WebinarQampA Qiqi Wang presents Fractures and Reservoir Quality in Tight Sandstones

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Understanding Fractures and Reservoir Quality in Tight Sandstones – Coupled Effects of Diagenesis and Deformation • Presented by Qiqi Wang • Discussion Topics: • 1) Mechanism for maintaining open fractures at reservoir depths in a sandstone with long diagenetic history. 2) Quantitative characterization of fracture abundance and spatial organization within the Nugget sandstone, East Painter Reservoir anticline • Key messages: • 1) Residual fracture porosity observed at great depth (greater than 4.5km), open pore space persisted for ~45my under diagenetic conditions • 2) Rock composition matters: Feldspar and lithics help retain fracture porosity under extensive quartz cementation • 3) Structural position matters: Fracture pattern and character varies with structural position • Bio: • Qiqi is a Ph.D. candidate in Geological Sciences at UT Austin. She's working with the Fracture Research and Application Consortium at Bureau of Economic geology. At UT, she had opportunities to look at natural fractures in various locations, ages and rock types. Two tasks for Qiqi's dissertation research: 1.Integrating outcrop and subsurface data, to gain better understanding on how deformation and diagenesis together modifies the reservoir property. 2.Adopting and adapting various statistical methods to improve diagnosis and prediction of fracture attributes/patterns, and rock properties. Concurrently with a PhD, Qiqi is pursuing an MS in statistics at UT, trying to apply the skills to analyzing petrographical and fracture data. Apart from work, Qiqi is an animal lover, a home cook, and an outdoor enthusiast. • References: • Calcite and dolomite bridging: • Gale, J.F., Lander, R.H., Reed, R.M. and Laubach, S.E., 2010. Modeling fracture porosity evolution in dolostone. Journal of Structural Geology, 32(9), pp.1201-1211. • Ukar, E. and Laubach, S.E., 2016. Syn-and postkinematic cement textures in fractured carbonate rocks: Insights from advanced cathodoluminescence imaging. Tectonophysics, 690, pp.190-205. • Normalized Correlation Count method and applications: • AAPG Petroleum Structure and Geomechanics Division, 2021, Rodrigo Correa: Quantifying spatial arrangement of fractures with normalized correlation count. 03 June. Available at: • AAPG PSGD Webinar/Q A: Rodrigo Correa... • Marrett, R., Gale, J.F., Gómez, L.A. and Laubach, S.E., 2018. Correlation analysis of fracture arrangement in space. Journal of Structural Geology, 108, pp.16-33. • Corresponding papers: • 1. Wang, Q., Laubach, S.E., Gale, J.F.W., and Ramos, M., 2019, Quantified fracture (joint) clustering in Archean basement, Wyoming: Application of Normalized Correlation Count method. Petroleum Geosciences. (The journal’s 3rd most read and downloaded paper 2019, ‘Best of Recent Paper’ award by Geological Society of London) • 2. Wang, Q., Narr, W. and Laubach, S.E., 2020. Characterizing Subsurface Fracture Spatial Distribution in the East Painter Reservoir Anticline, Wyoming. Unconventional Resources Technology Conference (URTEC). (Conference paper) • 3. Wang, Q., Laubach, S.E., and Fall, A., 2019, Coupled effects of diagenesis and deformation on fracture evolution in deeply buried sandstones. 53rd American Rock Mechanics Association symposium. (Conference paper)

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