延长组是鄂尔多斯盆地西南缘镇泾油田的重要勘探层位，通过岩心观察、测井解释、薄片分析和试 油结论等，对长6² 储层进行了含油性研究。研究表明：长6² 储层为三角洲—湖泊沉积体系，主要产油层位 于长6 ^2-2 的水下分流河道中，沉积细砂岩且物性较好，河道中心地区的产油量相对较高，而河道侧翼地区 的产油量相对较低。长6² 中的油层分布主要受岩性控制，是在北西倾斜的单斜背景上发育的岩性油藏。目 前油藏开发集中于长6 ^2-2 的上部砂体，中部粒度细的过渡带聚集着低于目前工业价值的剩余油，可以作为 下一步油气勘探开发的重点。

Yanchang Formation is an important hydrocarbon-exploring layer in Zhenyuan and Jingchuan area in southwestern Ordos Basin. Based on core observation, well log analysis, thin section analysis and conclusion of oil testing, the oiliness of Chang 6² reservoir is discussed. The result indicates that Chang 6² is a delta-lacustrine depositional system, and the principal producing pay is in subaqueous distributary channel where deposit fine sandstones and have good physical properties. The areas in the center of subaqueous distributary channel get high oilproduce while the flanks get lower oil-produce relatively. The distribution of oil layer is mainly controlled by lithology, and Chang 6² is lithologic reservoir developed in the monocline setting which cline to the northwest. Reservoir exploitation presently focuses on the upside ofChang 6 ^{2- 2}, and the transition zone carrying remaining oil can be prospected and exploited in the next step.