Compaction of Lithic Sands: Experimental Results and Applications

摘要: Compaction experiments showed that the degree of physical compaction a lithic sand is related to amount and type material present. These produced product texturally indistinguishable from natural sandstones. Generally, sedimentary fragments are more ductile than metamorphic fragments. Volcanic fragments, when altered phyllosilicate minerals by weathering or diagenesis, extremely ductile. Mineralogy intragranular microporosity influence ductility. Ratios based on weight percent soft, (clay micas) hard, brittle (quartz feldspar) within provides good indication A ratio greater 1 indicates will be h ghly Microporous dense Physical models were developed experimental data well-sorted sandstones for which percentage preserved porosities functions effective stress, material, quantity material. derived laboratory with at least 25% grains in following categories: moderately highly shale volcanic Application techniques modern subsurface samples (or outcrop equivalents) can provide valuable estimates (i.e., reservoir potential) may exploratory objecti es frontier basins. Examples using exploration given. Experimental precompaction cement overpressure beneficial porosity preservation. An early formed partial retard preserve stabilizing pack. later does not have this effect. Overpressure, early, retards reducing stress. Of course, late-developing preserving because an irreversible process.