徐家围子断陷火山岩充填的层序地层

松辽盆地徐家围子断陷晚侏罗世-早白垩世期间火山岩十分发育，火山喷发岩的盆地充填样式与其在盆地中喷发的构造位置和构造断阶样式有关。根据火山岩的喷发构造位置和赋存情况，徐家围子断陷火山岩的盆地充填样式可以分为三种类型：沿断裂喷发-赋存样式、在上升盘喷发-赋存样式和在下降盘喷发-赋存样式。这些火山岩的充填样式具有不同的几何学特征。在层序发育过程中火山的喷发与火山岩的充填分别出现在低水位早期、低水位晚期和水进期。在层序地层格架中不同火山岩的充填样式影响或控制了盆地的地形、沉积作用类型、沉积体几何学和层序结构。这种构造CD*2]火山活动背景下的层序地层模式可以作为油气勘探的地质模型，进行储集层预测。

Sequence Stratigraphy with Fills of Volcanic Rocks in Xujiaweizi Faulted Depression of Songliao Basin, Northeast China

Volcanic rocks widely developed during late Jurassic-Farly Cretaceous in Xujiaweizi faulted depression of Songliao basin, Northeast China. The basin filling geometric pattern of volcanic eruptive rocks depends on both of the eruptive locations in a basin and structural styles of fault terraces. It is divided into three types by eruptive locations and occurrences of eruptive rocks, including the pattern of eruption along fault and occurrence (PEAFO), the pattern of eruption on footwall of a fault and occurrence (PEOFO) and the pattern of eruption on hangingwall of fault and occurrence (PEOHO) in Xujiaweizi fault depression. Those basin filling patterns of volcanic eruptive rocks are with specific geometric characteristics, occurred at different stages of early lowstand, late lowstand and transgressive, controlling or affecting basin topography, sedimentation, the geometry of sedimentary body and sequence architecture during a sequence evolution. The sequence stratigraphic models may be used in oil and gas exploration to predict reservoirs.