Prior to circa 1975, the smectite group was called the montmorillonitesaponite group. Smectite minerals have large specific surface areas (10 700 m2/g) and exhibit a high expansion (swelling) capability in the presence of H2O. Smectite and vermiculite minerals are often referred to as quot;swellingquot; or quot;expandablequot; clay minerals.
This shale occurs in the Williston Basin, an intracratonic basin that occurs principally in North Dakota and Montana in the USA and in Saskatchewan in Canada. In North Dakota, the Bakken shale reaches a maximum thickness of 46 m and consists of a sequence of lower, middle and upper members (
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quartz; within the claysized fraction (62 Wm), the dominant mineral is illite. Thus, we consider this shale as an appropriate analog for finegrained sediments incoming to subduction zones, within which smectite has been transformedtoillite.Weobserveacoefficientoffriction(W)of0.42^0.68fortheilliteshale,consistentwithprevious
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Nov 01, 20190183;32;The finegrained sand and silt interbeddings are the major constituent of the shale in the Terry, as observed from core xray diffraction and thin section analysis. The presence of laminations smaller than the logging tools vertical resolution will result in averaging the tool response, which can overestimate water saturation and shale volume while underestimating porosity.
shale cuttings from the Frio Formation, to delineate the changes in mineralogy during burial diagenesis, to perform massbalance calculations in an attempt to de termine if shales act as open or closed systems during diagenesis and to better define the mechanism for the smectitetoillite reaction.
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