Abstract:

Donghe sandstone diagenesis were studied through core and rock slice observations and data analysises of scanning electron microscope and cathodoluminescence in the Hanilcatam depression. The reservoir rocks mainly is lithic quartz sandstone. The types of the diagenesis are the compaction, cementation, replacement and dissolution. The diagenetic stage belongs to the A middle diagenesis. The control of sedimentary facies, burial and sequence stratigraphy on diagenesis are discussed. Donghe sandstone in the study area was long-term shallow buried and shortterm quick deep buried in later period in the low-temperature background, so the degree of compaction is moderate in general. Shore and wave-dominated deltaic depositional systems are developed. Near the high-resolution sequence boundaries where relative sea-level rises, accommodate space increases, sediment deposition rate is relatively low, and residence time is long, develop laterally persistent carbonate cemented horizons in syndiagenesis and early diagenesis stages.

Key words: Donghe sandstone, diagenesis, sedimentary facies, burial, sequence stratigraphy, deposition rate