Comparisons of Capillary Pressure Curves between Low Permeability Sandstone and Micro-Fractured Marlstone
详细信息
- 责任者：Zang Shibin (Research Institute of Exploration and Development ; Qinghai Oilfield Company ; PertoChina ; Dunhuang 736202 ; China) ; Zheng Yongxian
- 刊名：Xinjiang Petroleum Geology
- 出版年：2011
- 卷期：32(5)
- 关键词：低渗透储集层 ; low permeability reservoirs ; 裂隙型储集层 ; fractured reservoirs ; 毛细管压力 ; capillary pressure
- 页码：p.504-507
- 图表：1 illus., 1 table, 4 refs.
- 分类号：1003
- 出版序号：714
- issnNo：ISSN1001-3873
- isbnNo：CN65-1107/TE
摘要
Usually, capillary pressure curve of sandstone is a smooth curve. However, the curve of marlstone with micro-fractures consists of two parts: an oblique line and a flat one. So the parameters such as threshold pressure and mean throat radius gained from capillary pressure curves of marlstone cannot describe the pore structure properly. This paper mainly discusses and analyzes the difference of mercury injection curves between sandstone and marlstone, and proposes a concept of effective throat radius to describe the pore structure of marlstone with micro-fracture. The case study shows this method is better than before.