Diagenesis of Paleogene sandstone from Kong 1 Member of Southern Kongdian in Huanghua depression

Huanghua depression is one of the richest areas in petroleum and natural gas in China.The Paleogene mainly consists of sandstone with facies of river,delta,fan delta and littoral-shallow lacustrine.Diagenesis played an important role in the properties of reservoir rocks.Applying X-ray diffraction,on the basis of analyzing many cores and thin sections,the authors studied diagenesis of Paleogene sandstone reservoir rocks in kong1 Menber of southern Kongdian in Huanghua depression.Diagenetic complexity shows that the sandstone in this area underwent compaction,cementation,isolation,recrystallization during the burying of sediments,and the first three compose the major diagenesis.The compaction and cementation led to decreasing porosity,and the solution of unsteady minerals also results in increasing in porosity.

Huanghua depression is one of the richest areas in petroleum and natural gas in China. The Paleogene mainly consists of sandstone with facies of river, delta, fan delta and littoral-shallow lacustrine. Diagenesis played an important role in the properties of reservoir rocks. Applying X-ray diffraction, on the basis of analyz- ing many cores and thin sections, the authors studied diagenesis of Paleogene sandstone reservoir rocks in kongl Menber of southern Kongdian in Huanghua depression. Diagenetic complexity shows that the sandstone in this area underwent compaction, cementation, isolation, recrystallization during the burying of sediments, and the first three compose the major diagenesis. The compaction and cementation led to decreasing porosity, and the solution of unsteady minerals also results in increasing in porosity.