七星河区位于宝清煤田南缘,区内存在5种等时界面,将含煤岩系分为6个成因单元10个亚单元。沉积环境演化经历了初始充填期、湖泊扩张期、湖泊收缩期、湖泊淤浅期和结束充填期5个阶段。区内主要的聚煤作用发生在湖泊淤浅期,聚煤有利部位位于废弃的扇三角洲体之上。 Qixinghe is located at the southern margin of the Baoqing coalfield. There are five kinds of isochronal interfaces in the area, and the coal-bearing rock series are divided into six sub-units of six genetic units. The sedimentary environment has undergone five stages: initial filling period, lacustrine expansion period, lake contraction period, lacustrine sedimentation period and ending filling period. The main coal accumulation in the area occurred in the shallow period of lakes. The favorable coal accumulation site was located on the abandoned fan delta body.