彬长地区位于甘肃省灵台县、泾川县、宁县和正宁县与陕西省长武县、彬县和旬邑县交界地区,构造位置为鄂尔多斯“盆地”渭北隆起。经研究得出,长7油层组沉积期全区均为深湖、半深湖-浊流环境,早期经历了深湖相沉积,中期经历了外扇亚相沉积→中扇亚相→外扇亚相→中扇亚相→外扇亚相的两个半旋回,晚期经历了中扇亚相→外扇亚相1个旋回。 The Binchang area is located in the boundary areas of Lingtai County, Jingchuan County, Ningxian County and Zhengning County, Gansu Province and the Changwu County, Binxian County and Xunyi County in Shaanxi Province. The location of the area is Erdos Basin and Weibei Uplift. The study shows that all the sediments of Chang 7 reservoir are deep lacustrine, semi-deep lacustrine-turbid environment, experienced deep-lacustrine facies deposition in the early stage, experienced extrinsic subfacies deposition → middle subfacies → outer fan Subfacies → mid-fan subfacies → outer fan subfacies of the two semi-cycles, late experienced fan subfacies → fan subfacies 1 cycle.