下辽河西部凹陷下第三系地层及沉积特征

Lower tertiary stratum of lower Liaohe River's western hollow and its sedimentary characteristics

针对下辽河坳陷西部凹陷位于辽河盆地,地质构造条件十分复杂的问题,西部凹陷上、下第三系发育较全,其中下第三系地层沙河街组是重要的储层,沙河街组又分沙四至沙一4个岩性段,通过对沙河街组地层、沉积相、沉积环境的深入分析,确定沙河街组三段、四段存在着良好的生油储油地层条件,找矿潜力大,并为今后该地区的找矿探矿提供一些基础资料。

Western hollow of lower Liaohe River depression lies in Liaohe basin where geological structure condition is very complicated. The upper and lower tertiary in westem hollow is developed fairly completely with the Shahejie formation in lower Tertiary the important reservoir. The formation is divided into four lithologic members from No.4 to No. 1. Deep analyses of Shahejie formation stratum, sedimentary facies and sedimentary environment indicate that the 3rd and the 4th members of Shahejie formation have favourable oil generation and storage stratum conditions,with great mineral potential. The study provides basic data for mineral exploration in this area.