Download Quartz cementation in sandstones by R. Worden, Sadoon Morad PDF
By R. Worden, Sadoon Morad
Compiles many of the major strands of analysis into quartz cements, and supply a spotlight for debate in addition to instructions for destiny examine. Softcover.
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Extra resources for Quartz cementation in sandstones
Example text
In water-wet sandstone reservoirs with a typical residual water saturation, the presence of oil is also unlikely to affect significantly the rate of precipitation of quartz cement because the surface of grains will be coated with water. In comparison, in oil-wet systems, the surface of detrital quartz grains will be coated with oil and silica, in aqueous solution will be unable to gain access to allow precipitation and growth of quartz cement (Fig. 9). The effect of oil emplacement on the transport of silica The transportation of silica can be divided into two endmembers: (i) diffusion and (ii) advection (Fig.
The degree of retardation was assessed quantitatively by Worden et al. (1998) and was shown to be a function of the water/oil ratio and wettability. At typical residual water saturations for water-wet sandstones, diffusion was slowed by several orders of magnitude relative to the aquifer. Thus even in water-wet sandstones in which surface processes (solution and precipitation) control the rate of cementation in the aquifer, diffusion will be retarded and will be become rate-limiting in the overlying oil leg.
Thus, in situations where there has been widespread differential uplift there will be no clear correlation between the volume of cement and the present day burial depth. 6000 Depth (ft) 25 8000 10000 12000 14000 16000 0 4 8 12 16 20 Authigenic quartz cement (%) Fig. 5. Quartz cement in the Frio sandstones of the US Gulf Coast. From Land (1984). Tertiary Sandstones of the Gulf Coast A number of authors have published data on the abundance of quartz cement in Tertiary Sandstones of the Gulf Coast.