Vertical Zonation of Weathered Crust Ancient Karst and the Reservoir Evaluation and Prediction——A Case Study of M55-M51Sub-Members of Majiagou Formation in Gas Fields, Central Ordos Basin, NW China
详细信息
- 责任者：He Jiang (College of Resource and Environmental Engineering ; Southwest Petroleum University ; Chengdu 610500 ; China) ; Fang Shaoxian
- 刊名：Petroleum Exploration and Development
- 出版年：2013
- 卷期：40(5)
- 关键词：储层评价 ; reservoir evaluation ; 储层预测 ; reservoir prediction ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.534-542
- 图表：6 illus., 2 tables, 26 refs.
- 分类号：1003
- issnNo：ISSN1000-0747
- isbnNo：CN11-2360/TE
摘要
The M55-M51sub-members of the Middle Ordovician Majiagou Formation in gas fields of central Ordos Basin were taken as a case to analyze the vertical zonation characteristics of weathered crust ancient karst and to evaluate and predict reservoirs through plenty of core and thin section observation, with geological background and petrological characteristics as main clue. According to detailed underground geological survey, description of typical karst section, systematic sampling, and laboratory test, there mainly developed karst formation rock and transformation rock in ancient weathered crust in the top of the Majiagou Formation, which were divided into surface karst zone, vertical vadose zone, horizontal underflow zone and deep slow flow zone from surface to subsurface. Karst intensity in each zone has great effect on the storage and flow capacity of reservoir. In the strong karstification subzone of the horizontal underflow zone with over strong karst, the parent rock was extensively damaged and formed karst caves filled with karst formation rock rarely with pores. In the deep slow flow zone with over weak karstification, there are sedimentary and filling activities. The medium karstification subzone of the horizontal underflow zone and the vertical seepage zone had a moderate karstification, which not only created storage and flow space but also prevented collapse, and were most beneficial to reservoir development.
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