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查明研究区物源方向对于砂体展布、储集层预测和圈闭评价有重大意义。本文通过对方正断陷古近系新安村+乌云组、达连河组、宝泉岭组重矿物组合特征研究,并结合重矿物ZTR指数分析结果和区域构造演化特征,明确研究区古近系沉积物源主要来源于断陷西、西北、东南和东北四个方向。各物源体系重矿物组合特征及其含量反映的物源属性均存在较大的差异,在平面上以伊汉通断裂为界呈南北分带性,垂向上重矿物组合及物源方向有较大的继承性,ZTR指数从大到小的变化规律表明断陷经历了从断陷初期远物源到断坳转换期近物源的演化过程。
Identifying the provenance direction of the study area is of great significance to sand body distribution, reservoir prediction and trapping evaluation. Based on the study on the characteristics of heavy minerals assemblages in Xinancun + Wuyun Formation, Dalianhe Formation and Baoquanling Formation of Paleogene in Founder Fault Depression, combined with the analysis results of ZTR index and regional tectonic evolution of heavy minerals, Sediment sources mainly come from the four directions of fault depression in the west, northwest, southeast and northeast. The characteristics of heavy mineral assemblages and the provenance attributes reflected by their contents in all provenance systems are quite different. On the plane, they are north-south zonal with the Yihan-Tongsha fault as the boundary, and the vertical heavy mineral assemblages and source directions The large inheritance and the changing law of ZTR index from large to small indicate that the fault experienced the evolution of near-provenance from the early source to the fault-depression during the initial fault faulting.