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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62-2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62-2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 exploration layer in Zhenjing Oilfield on the southwestern margin of Ordos Basin. The oil content of Chang 62 reservoir has been studied by core observation, log interpretation, slice analysis and oil testing conclusion. The results show that the Chang 62 reservoir is a delta-lake sedimentary system. The main oil-producing layer is located in an underwater distributary channel with a length of 62-2. Fine sandstones are deposited and have good physical properties. The oil production in the central part of the channel is relatively high, The yield on the flanks is relatively low. The reservoir profile in Chang 62 is dominated by lithology and is a lithologic reservoir developed on a monoclinic background northwest of the slope. At present, reservoir development is concentrated in the upper sand body of Chang 62-2. The transitional zone with fine grain size in the central part collects remaining oil lower than current industrial value, which can be used as the focus of the next exploration and development of oil and gas.