• 责任者：Li Wei (Key Laboratory of Oil and Gas Resources and Exploration Technology ; Ministry of Education ; Yangtze University ; Wuhan 430100 ; China) ; Wen Zhigang
• 刊名：Sedimentary Geology and Tethyan Geology
• 出版年：2013
• 卷期：33(3)
• 关键词：储层评价 ; reservoir evaluation ; 储层性质 ; reservoir properties ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.40-47
• 图表：5 illus., 4 tables, 23 refs.
• 分类号：1003
• issnNo：ISSN1009-3850
• isbnNo：CN51-1593/P

     The petrographic, physical and pore throat characteristics and heterogeneity of the Chang-71reservoirs from the Yanchang Formation in the Maling region, northern Shaanxi are discussed on the basis of core observation, cast section, scanning electronic microscope, X-ray diffraction analysis, grain-size analysis and mercury-injection curves. The Chang-71reservoirs in the Maling region are characterized by low to extralow porosity, uhralow to extralow permeability and intense heterogeneity. The main factors influencing the reservoir capacity include sedimentary environments, nature of sketchetal grains and diagenesis. The sedimentary environments, paulopost diagenesis and cementation are responsible for poor physical properties of the reservoirs, and dissolution led to the modification of the reservoirs. In the light of the physical and porosity parameters, the reservoirs in the study area may be classified into four types, and the Chang-71 reservoirs in the Maling region are dominated by the Ⅲ type.