Pore Scale Imaging of Unconventional Reservoirs in Petrophysical Workflows
Terri Olson (Digital Rock Petrophysics)
Imaging technology has advanced in recent years to enable investigation of pore systems in very fine-grained reservoirs. A review of state-of-the-art techniques will include methods focused on nanometer- and micron-scale observations plus integration across scales. Pore type, pore size, pore connectivity, wettability, mineralogy and fabric are among the aspects that are best addressed with such techniques in microporous reservoirs. Questions that these methods address will be discussed, along with their relevance to petrophysical interpretation and their place in formation evaluation workflows. Case studies will be shown to illustrate application of pore-scale imaging to assessing tight sandstone and “shale” plays.

Applications to tight sandstone in the Green River Formation in the Uinta Basin in Utah include imaging wettability with FESEM and associating altered wettability with specific mineral phases; and detecting formation damage mechanisms in SEM images taken before and after exposure to completion fluids. Shale examples of workflows include combining MicroCT images, mineral maps, FESEM images, and FIBSEM image data to yield both insight and quantitative results.

Issues with image data, potential pitfalls in interpretation, and new frontiers for core analysis based on imaging techniques will also be covered.

http://dwls.spwla.org/2017_Spring_Workshop.htm#Olson

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