• 责任者：Wang Ping (College of Earth Science and Resources ; Chang’an University ; Xi’an 710054 ; China) ; Zhang Zhisheng
• 刊名：Journal of Stratigraphy
• 出版年：2013
• 卷期：37(1)
• 关键词：延长组 ; Yanchang Formation ; 地层划分 ; stratigraphic classification ; 油藏 ; oil reservoirs ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.62-72
• 图表：illus., 5 tables, 27 refs.
• 分类号：1003
• issnNo：ISSN0253-4959
• isbnNo：CN32-1187/P

A century stratigraphic investigation of the oil- and gas-bearing Yanchang Formation in the Ordos Basin has generated numerous schemes of stratigraphic subdivision and correlation. For the purpose of oilfield development, the subdivision of oil- and gas-bearing sequence should be based on lithostratigraphy. The Yanchang Group includes sediments deposited in lacustrine and fluvial environments in the middle-late Triassic Period in the Ordos Basin. We propose that the oiland gas-bearing sequence of the Yanchang Group can be subdivided into ten oil- and gas-bearing formations （Changl-Chang20）. Of these formations, the Chang2 can be subdivided into three oil and gas-bearing members （Chang2^1-Chang2^3）. The Chang2^1oil member can be further divided into three compound oil and gas-bearing layers and several single layers. The detailed stratigraphic study of the Chang~ oil member is a key to the oilfield development in the area.