Kinetic Modeling of Quartz Cementation and Porosity Loss in Deeply Buried Sandstone Reservoirs

摘要: A mathematically simple kinetic model simulates quartz cementation and the resulting porosity loss in quartzose sandstones as a function of temperature history. Dissolved silica is considered to be sourced from dissolution at stylolites or individual grain contacts containing clay mica, diffuses short distances sites precipitation on clean surfaces. The modeled sandstone volume located between stylolites, no interpenetration takes place within this volume. After starts, compactional typically minor, therefore equal precipitated cement. process mod led rate-controlled reaction where rate per unit time surface area can expressed by an empirically determined logarithmic temperature. When sandstone's history known, time, amount cement certain interval calculated multiplying with available for integrating respect time. Because will change proceeds, calculations are performed steps, adjusted after each step. total p ecipitated during burial corresponding found taking sum increments effect variation parameters such size, detrital content, abundance other coatings, prequartz porosities, easily simulated presented algorithm. This flexibility illustrated presenting histories range sizes, framework compositions, degree coat development, histories.