高校地质学报Issue(2)：364-372,9.
特低渗透砂岩的核磁共振水驱油特征及其影响因素--以鄂尔多斯盆地延长组为例
Characteristics of NMR Water Displacing Oil and Influencing Factors in Extra-low Permeable Sandstones：Taking the Yanchang Group in Ordos Basin as an Example
摘要
Abstract
Samples of Yanchang group in Ordos Basin were tested using the NMR technique before and after the water-looding experiments in order to analyze the characteristics of water displacing oil and to reveal the dominant factors for extra-low permeable sandstones. The results show that oil phase T2 patterns present double peaks in an irreducible water condition with crossing points at about 16.68 ms and movable oil parameters are sensitive to permeability. The right peak decreases to different extents after water-flooding; while the drop of left peak is related to the imbibition of capillary. If the imbibition of capillary can be utilized effectively, recovery can be enhanced. Average value of movable oil percentage is 57.62 and displacement efficiency is 37.33. There is about 20.29% movable oil that has not been flooded out and the development potential is still great after water displacing oil for extra-low permeable sandstones. Physical property, matching relationship of pore throat, degrees of microcrack development, occurrence forms of clay mineral are the main factors affecting displacement efficiency. Correlation between displacement efficiency and movable oil percentage confirms that movable oil percentage of NMR is the upper limit of displacement efficiency.关键词
核磁共振/水驱油/微观成因/可动油百分数/特低渗透砂岩/鄂尔多斯盆地Key words
NMR/water displacing oil/micro-origins/movable oil percentage/extra-low permeability sandstone/Ordos Basin分类
天文与地球科学引用本文复制引用
..特低渗透砂岩的核磁共振水驱油特征及其影响因素--以鄂尔多斯盆地延长组为例[J].高校地质学报,2013,(2):364-372,9.基金项目
本文由国家自然科学基金（41102081）；教育部科学技术研究重点项目（212172）；陕西省自然科学基础研究计划（2012JQ5003）和国家科技重大专项（2011ZX05013-005）联合资助 （）
