松辽盆地南部梨树断陷下白垩统营城组物源分析

Provenance analysis of Lower Cretaceous Yingcheng Formation in Lishu Faulted Depression of southern Songliao Basin

杨帆 2 王宏语 2 聂文彬³ 鄢伟 2 魏源 2

中国地质大学（北京）能源学院，北京 100083 中国地质大学（北京）海相储层演化与油气富集机理教育部重点实验室，北京 100083 中国石油辽河油田公司勘探开发研究院，辽宁 盘锦 124010

School of Energy Resources, China University of Geosciences, Beijing 100083, China MOE Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, China University of Geosciences, Beijing 100083, China Research Institute of Exploration and Development, Liaohe Oilfield Company, PetroChina, Panjin 124010, China

建立梨树断陷高精度层序地层格架的基础上，通过岩心观察描述以及分析化验资料综合分析，从岩石矿物成分、重矿物组合以及锆石-电气石-金红石指数（ZTR）、砂体体积分数平面展布、泥岩颜色区域分布等方面对物源方向进行了判断。综合分析表明: 松辽盆地南部梨树断陷营城组沉积早、中、晚时期物源随时间有所变化，但变化不大。该时期主要存在北部、西北、东部3个方向的物源体系。营城组沉积早期，东部物源为主要物源；营城组沉积中期，东部物源有所分化，东南方向的物源起主导作用；营城组沉积晚期，整体物源整体向西迁移。整个时期北部物源一直稳定持续的供给。

Based on high resolution sequence stratigraphy, core observation and analytical data, the provenance of Lower Cretaceous Yingcheng Formation in Lishu Faulted Depression of southern Songliao Basin is estimated according to the mineral content of sedimentary rocks, ZTR index of heavy mineral, the sandstone percent and color distribution of mudstone. The results show that the provenance of Yingcheng Formation changes with time, but the change is small at the early, middle and late stages. At this time, the sediments of Yingcheng Formation are mainly derived from the northern, northwestern and eastern provenance. In the early time of Yingcheng Formation, the eastern provenance is the main source. Due to the weakening of the eastern provenance, the southeastern provenance is the main source at the middle stage. At the late stage, the entire of the provenance migrates to west. The northern provenance supplies sources in the whole period of Yingcheng Formation.

10.6056/dkyqt201206005