Characteristics and mechanism of low permeability beach-bar sandstone reservoir of Es₄ in Dongying sag

详细信息    查看全文

• 作者：Hua-ai WANG ; Jian-hua ZHONG ; Fu-ping ZHONG ; Yong-bin NIU ; Pei-jun WANG
• 关键词：beach-bar sandstone ; low-permeability ; reservoir characteristics ; sedimentation ; diagenesis
• 刊名：Mining Science and Technology (China)
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：19
• 期：6
• 页码：788-795
• 全文大小：1481 K

文摘

Core and cast sections observation and description, and logging, scanning electron microscope and core lab analysis data etc. were applied to the present research of the characteristics and mechanism of low permeability beach-bar sandstone reservoir of Es₄ in Dongying sag. The results indicated the reservoir has the characteristics of middle-low pores, low-permeability, low compositional and structural maturity, and thin throat. The low-permeability is mainly due to sedimentation (fine particles and argillaceous inter beds) and diagenesis (compaction, cementation, and dissolution). The cementation reduced the physical property of the reservoir mainly by carbonate cementation, quartz autogeny and enragement, and autogeny clay. Clay minerals usually jam the pores by filling holes, close-fitting the wall of hole, bridging, wrapping grains, and separate attaching the pores and so on. The dissolution is insufficient so as not to improve the porosity and permeability of the reservoir obviously. So it is also an important factor of forming low-permeability reservoir.