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依兰矿区位于佳依地堑北段方正断陷北部边缘斜坡带。区内同沉积断裂发育,主要有盆缘同沉积断裂和盆内同沉积断裂2种类型。通过对盆内同沉积断裂两侧沉积特征分析,确定了本区4条主要的同沉积断裂。这些同沉积断裂呈NE向展布,形成阶梯状反向正断层组合,生长指数1.3~2.2,主要活动于达连河组沉积期间。盆内同沉积断裂的活动特征与盆缘断裂密切相关,两者共同对区内沉积环境的演化起了重要的控制作用。
Yilan Mining Area is located in the northern margin of Jiayi fault depression north of the Founder fault depression belt. There are two types of synsedimentary faults in the area, mainly including basin margin syndepositional faults and intra-basin syndepositional faults. Based on the analysis of sedimentary characteristics on both sides of the same sedimentary basin in the basin, four major synsedimentary faults have been identified in this area. These synsedimentary faults are distributed in a NE direction and form a stepped reverse normal fault combination with a growth index of 1.3-2.2. The main activity occurred during the deposition of the Dalianhe Formation. The activity characteristics of intra-basin synsedimentary faults are closely related to basin margin faults, and both of them play an important role in controlling the evolution of sedimentary environment in the basin.