三肇凹陷葡萄花油层浅水三角洲沉积特征及成藏模式

本文通过对研究区沉积微相的详细研究确定三肇凹陷葡萄花油层为河控浅水三角洲沉积。平面上，浅水三角洲的前缘亚相发育且以水下分流河道沉积为主，河口坝和远砂坝不发育。垂向上构成了先水退后水进型浅水三角洲沉积模式。通过油的空间分布和油运移的通道特征确定葡萄花油层油成藏模式为青一段源岩生成的油在其内部超压和浮力的作用下通过油源断层向上运移至葡萄花油层，然后在古鼻状构造的背景下沿断裂沟通的河道砂体侧向运移至构造有利部位聚集成藏。 油源断裂控制油聚集的具体部位，河道砂体发育的圈闭为油聚集成藏提供场所。

Sedimentary features and oil accumulaltion mode of shallow-water delta of Putaohua oillayer in sanzhao depression

Study of microfacies in study area shows that river-dominated shallow-water delta is the facies of Putaohua oillayer in Sanzhao depression. In plane, delta front develops well and the main microfacies is under-water channel, while river-mouth bar and distal bar not develop well. In vertical, water advance follows water recession. Oil accumulation mode of Putaohua oillayer is oil generated by K1q1 source rocks transported to Putaohua oillayer under the inner overpressure and buoyancy along oil-source faults,.Laterally transported to favorable structural parts to accumulate along channel sandbody connected by faults under the background of nose structure.Source faults control position of oil accumulation and traps with channel sandbody developing provide location for oil accumulation