Multi-Parameter Classification and Evaluation Methods of Clastic Reservoir under The Constraint of Effective Reservoir Physical Property Lower Limit And Productivity

详细信息   

• 责任者：Wang Yanzhong (School of Geosciences ; China University of Petroleum ; Qingdao 266555 ; China) ; Cao Yingchang
• 刊名：Chinese Journal of Geology
• 出版年：2012
• 卷期：47(2)
• 关键词：碎屑岩储集层 ; clastic reservoirs ; 储层评价 ; reservoir evaluation ; 东营凹陷 ; Dongying Sag
• 页码：p.483-498
• 图表：illus., 4 tables, 25 refs.
• 分类号：1003
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

Reasonable methods of reservoir classification and evaluation are very significant to oil and gas exploration among deep clastic reservoirs. By the study of the deeply buried Palaeogene clastic reservoirs in Dongying sag, a multi-parameter clastic reservoir evaluation method applicable to deeply buried reservoirs was concluded, which is restricted by physical property lower limit and production ability of effective reservoirs. Based on the research of reservoir characteristics and physical property lower limit of effective reservoirs, the main controlling factors of the development of effective reservoirs is analyzed with porosity difference and permeability difference as the compared parameters. By coupling the controlling factors, reservoirs can be classified comprehensively and the economic capacity of different types of reservoirs is evaluated regarding single well productivity as the evaluation parameter. Depending on superimposing different graphs, distribution of effective reservoirs can be predicted. The study results show that the deeply buried Palaeogene reservoirs in Dongying sag consist mainly of sublacustrine fan, nearshore subaqueous fan and flood-overlake. Four types of pressure system, including normal pressure, weak overpressure, medium overpressure and strong overpressure, were developed in the reservoir. The reservoirs are now mainly at middlediagenetic stage A 1,middle diagenetic stage A2 and middle stage B. Sedimentation is the most important controlling factor to the development of effective reservoir, while the controlling action of digenesis on reservoirs is based on sedimentation and formation pressure. Comprehensively considering the controlling factors of reservoirs, the deeply buried Palaeogene reservoirs in Dongying sag are divided into four categories, further into eight subcategories. Among the categories,type Ⅰ ,type Ⅱ1 and part of type Ⅱ 2 are high-quality reservoirs; part of type Ⅱ 2 and type Ⅲ are medium effective reservoirs; type Ⅱ 3, type Ⅲ2 and type Ⅲ1are inferior effective reservoirs with measures of acidization or fracturing ; type Ⅳ are ineffective reservoirs.