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研究区识别出了4种沉积相:冲积扇相、扇三角洲相、辫状河三角洲相、湖泊相。南宫凹陷、明化镇凸起、大营凹陷组成了两凹一凸的构造格架,两凹陷均是西缓坡、东陡坡。早期断陷阶段,冲积扇相、扇三角洲相、辫状河三角洲相在缓坡带大规模发育,在陡坡一侧发育扇三角洲相,凹陷沉降导致中部变为湖相沉积;强烈断陷阶段,凹陷基底急剧下降,使得湖泊相发育;晚期断陷阶段,湖退现象明显,加之气候干旱使得大片盐湖发育。
The study area identified four sedimentary facies: alluvial fan facies, fan delta facies, braided river delta facies, and lacustrine facies. Nangong depression, Minghua town raised, Daying depression composed of two concave and convex structure of the grid, the two sags are West gentle slope, east steep slope. In the early stage of fault depression, alluvial fan facies, fan deltaic facies and braided river delta facies were developed on a large scale in the gentle slope belt. On the steep slope side, fan delta facies were formed, and depression depression led to the central deposition of lacustrine facies. During the intense fault depression and depression The sharp decline of the basement resulted in the development of lacustrine facies. In the late stage of fault depression, the phenomenon of lake retreat was obvious, accompanied by the arid climate which resulted in the development of large-scale salt lakes.