In today's industry, the term ______ is typically used to describe any fine - grain sedimentary rock that require massive stimulation for economic recovery. Shale In today's industry, the term "shale" is typically used to describe any _________________________________________________ fine - grain sedimentary rock that require massive stimulation for economic recovery. In today's industry, the term "shale" is typically used to describe any fine - grain sedimentary rock that require massive stimulation for economic recovery. In this terminology shale rock may be composed of ____________ (smectite, illite, chlorite, kaolinite), quartz, feldspar, and carbonates. clay minerals In shales, ______ content varies between ~10 to 70% in these plays while the rest is _____ and ______. Clay; quartz; carbonates For which of the following rock mineralogy is more important? A. High permeability conventional reservoir B. Ultra-low permeability shale reservoir The mineralogy of shale rocks is very important for hydrocarbon recovery because rocks with less clay and more quartz and carbonates are more ______ and potentially comprised of _______________. brittle, larger pores More brittle rocks are ______ to fracture in hydraulic fracturing stimulation compared to ductile/deformable rocks. Easier Many shale reservoirs are petroleum _____________, mainly characterized by low permeability less than 1 micro Darcy (µD). source rocks