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The term “reservoir quality” is commonly applied to the porosity and permeability of reservoir and associated rocks. This chapter focuses on the primary and secondary geologic factors that control the reservoir quality of deepwater sands and sandstones. Primary controls are related to the grain-size distribution of the sediment at the time of deposition. Secondary controls include the degree to which detrital mud infiltrates into pores between sand grains prior to lithification, and the processes of compaction, cementation and dissolution to which the sands are subjected upon burial. Before discussing these factors, we review the common methods of sampling and measurement of porosity and permeability.

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