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中文摘要：
目的 对鄂尔多斯盆地姬塬油田长4＋5砂岩储层微裂缝与水驱油特征进行综合研究。方法 在研究区评价井、探井、生产井动态资料解释的基础上，通过岩心观察、薄片分析、真实砂岩微观模型水驱油实验的方法分析裂缝与水驱油特征。结果 姬塬油田长4＋5储层岩性主要为岩屑长石砂岩，岩屑平均含量17．1％；几乎在所有的岩石碎屑集合体中均发育有微裂缝，微裂缝的发育受控于3种因素：三角洲古坡度、成岩过程中的差异压实作用和构造运动。结论 长4＋5储层基质孔隙主要通过岩屑中的微裂缝相互连通，两者之间构成良好的网络连通系统；储层中微裂缝对储集空间的贡献作用不大，微裂缝能够降低注水压力，对于连通基质孔隙、提高储层的渗流能力起到重要的作用。
英文摘要：
Aim The multidisciplinary analysis on characteristics of micro-fracture and water-flooding in Chang 4 ＋ 5 sandstones reservoir of Jiyuan Oilfield. Methods Rely on dynamic data of exploration wells, producible wells, appraisal wells, and use methods of core observation, thin section analysis, experiment of authentic sandstone micro model. Results The Chang 4 ＋ 5 reservoir rock of Jiyuan Oilfield is mainly lithic arkose with average rock fragment content of 17.89%. Micro-fracture is well developed in rock fragments aggregation. Three controlling factors of micro-fracture well developed is delta slope, differential comparison during diagenetic process and tectonic movements. Conclusion Micro-fractures mostly found in rock fragments connect each other through matrix pore. The micro-fracture and reservoir matrix pore compose a net-model seepage system with good performance. Micro-fracture can reduce the injection pressure, improve the connect ability between the micro-fracture and pore, and enhance the seepage ability in the reservoir rock.
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