• 责任者：Lei Xiaolan (Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Zhang Lin
• 刊名：Geological Bulletin of China
• 出版年：2009
• 卷期：29(5)
• 关键词：砂岩储集层 ; sandstone reservoirs ; 成岩作用 ; diagenesis ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.603-608
• 图表：5 illus., 1 table, 17 refs.
• 分类号：1003
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

Based on the analysis of casting lamella,scan electron microscope and X-ray diffractions of sandstone lamella, this paper conducted research on the petrology characteristic, diagenesis stage division and its influence on porosity of Chang-4+5 reservoir in Yaodian oilfield of central Ordos Basin. It is indicated that the main reservoir sand in the area is arkose with diagenesis type including compaction, cementation and dissolution. Overall diagenesis process includes early stage (A and B phases) and late stage (A1 and A2 phases). The early compaction and multi-mineral cementation are the major factors that leads to poor petrophysical property of Chang-4+5 reservoir, but the chlorite film formed during the early stage helps to preserve some primary porosity, dissolution at the phase A during the late stage, especially feldspar dissolution is one of significant factor controlling the quality of reservoir.