石油实验地质2017，Vol.39Issue(2)：169-179,11.DOI:10.11781/sysydz201702169
鄂尔多斯盆地延长组储层致密化及其影响下的致密油充注特征
Reservoir densification and tight-oil charging in Yanchang Formation, Ordos Basin
摘要
Abstract
The Yanchang Formation in Longdong area, Ordos Basin, is characterized by low porosity and permeability and is considered as a tight-oil reservoir. However, reservoir densification and its influence on oil charging are not well-understood. Based on the analysis of reservoir diagenesis, densification history, oil-water distribution, driving force and resistance, the oil charging process in tight-sand reservoirs was discussed. The results showed that porosity evolution of the Chang 6-Chang 8 reservoirs has gone through four stages, and they became tight during the diagenetic A1 stage, which was prior to oil charging. And the large resistance due to narrow pore throats made it impossible for buoyancy to be a driving force. Since the tight-sand reservoir is currently oil-saturated with "sweet spots" in locally high-quality reservoir, the excess pressure difference between the Chang 7 source rock and the Chang 6-Chang 8 reservoir is considered to be the main driving force for oil charging in the tight reservoirs.关键词
储层致密化/充注动力/致密油/延长组/鄂尔多斯盆地Key words
reservoir densification/charging force/tight oil/Yanchang Formation/Ordos Basin分类
能源科技引用本文复制引用
郭继刚,郭凯,宫鹏骐,徐静,郭晶..鄂尔多斯盆地延长组储层致密化及其影响下的致密油充注特征[J].石油实验地质,2017,39(2):169-179,11.基金项目
国家自然科学基金项目( U1262205)资助. （ U1262205）
