火山-碎屑充填盆地的层序地层学研究——以松辽盆地长岭断陷为例

Sequence stratigraphic research of volcanic and clastic sediment basins: A case study of Changling Fault Depression in Songliao Basin

王苗 陆建林 左宗鑫 王保华 李浩 张彦霞

Wang Miao Lu Jianlin Zuo Zongxin Wang Baohua Li Hao Zhang Yanxia

中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

针对长岭断陷早白垩世地层受多期构造运动和火山改造影响，地层结构复杂、对比困难等问题，该文运用新采集的岩心、测井、地震及测年资料，在盆地形成的动力学机制及火山作用系统分析的基础上，以层序地层学、沉积学理论为指导，对断陷层结构及层序地层特征开展了研究。提出了“火山岩+碎屑岩”二元结构的层序界面识别方法，建立了长岭断陷早白垩世断陷层层序地层格架；提出了3种层序构成样式，分别为火山断陷湖层序构成样式，“火山岩+碎屑岩”二元结构的缓坡坡折型层序样式，“火山岩+碎屑岩”复合层状层序样式。这3种层序构成样式能有效确定生储盖层的组成特征。

The Early Cretaceous is complicated and hard to compare since it was influenced by multiple tectonic movements and volcanism. In order to resolve the problems mentioned above, we studied stratum structure and sequence stratigraphy based on freshly obtained outcrop, core, well logs, seismic and dating data, using basic principles of sequence stratigraphy and sedimentology. The kinetic mechanism and volcanism in this area were also considered in the research. Some identification methods for dual-structure basins with "volcanic rocks and sedimentary rocks" were put forward, and the stratigraphic sequence framework of the Early Cretaceous in the Changling Fault Depression was set up. Three sequence patterns were proposed:volcanic fault lake sequence, gentle slope composed of "volcanic and sedimentary rocks" in a dual structure sequence, and "volcanic and sedimentary rocks" constitute straticulate (finely laminated) sequence. These sequence patterns have a guiding significance for identifying source, reservoir and cap rock assemblages.

中国石化科技开发部项目“长岭断陷结构与充填特征及成藏组合研究”（P13073）资助。

https://doi.org/10.11781/sysydz201606796