Outcrop Characteristics of Paleokarst Reservoir in the Xekar Area, Tarim Basin

• 责任者：Liu Wei (Research Institute of Petroleum Exploration and Development ; Beijing 100083 ; China) ; Luo Ping
• 刊名：Acta Geologica Sinica
• 出版年：2010
• 卷期：84(8)
• 关键词：碳酸盐岩储集层 ; carbonate reservoirs ; 塔里木盆地 ; Tarim Basin
• 页码：p.1215-1222
• 图表：7 illus., 1 table, 19 refs.
• 分类号：1003
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

At the end of Eocene, Himalayan Movement led to extensive lateral compression and vertical uplift in the Keping-Bachu area, and this resulted in exposure of Lower-Middle Ordovician paleokarst, offering an excellent opportunity to study the outcrops of paleokarst reservoirs. The Xekar profile in the Tarim basin was selected as objective in order to better understand the characteristics and evolution process of paleokarst reservoirs formed in high-rainfall tropic climate. The study shows that carbonates with different textures have different responses to karst. The Yijianfang Formation, which consists of reel and beach, forms laminar reservoir structure, in which vugs and small caves are well developed; while the Yingshan Formation containing micrite and calcarenite is heterogenetic fracture-cavity reservoirs, in which big dominant fractures resulted from karstification.